Greater Sydney in August 2021: Warm and wetter than average

Greater Sydney experienced generally dry weather with the exception of a wet two-day event that resulted in the monthly rainfall being above average. Temperatures were mostly above average for this time of the year.

A wet two-day event results in a wetter than average month

  • A low pressure system off the New South Wales coast delivered rainfall in excess of the monthly average to most sites from the 24th to the 25th.
  • In the 48 hours to 9am on the 25th, many sites recorded 50 to 100 mm of rainfall.
  • Although the rest of the month was generally dry, this wet two-day period resulted in monthly rainfall totals being 110 to 150% of their monthly average for many sites.

Warm temperatures

  • Temperatures were above their monthly average at most sites.
  • Mean maximum temperatures were generally 1 to 1.5 °C above their monthly average.
  • Sydney set an August record with 15 consecutive days of 20 °C or above from the 9th to the 23rd.
  • Mean minimum temperatures were generally 0 to 0.5 °C above their monthly average, with sites towards the west being slightly below average.
  • Some sites had their coldest August day (lowest maximum temperature) on record as a result of the coastal low on the 24th.

Sydney (Observatory Hill)

  • Total rainfall for Sydney (Observatory Hill) was 81.4 mm, which is 101% of the long-term average at the former Observatory Hill site, or 108% of the average over recent decades.
  • The mean daily maximum temperature for Sydney (Observatory Hill) was 20.7 °C, which is 2.8 °C above the long-term average at the former Observatory Hill site, or 1.4 °C above the average over recent decades.
  • The warmest day was 25.6 °C on the 1st, and the coolest day was on the 24th when the temperature reached 11.5 °C.
  • The mean daily minimum temperature for Sydney (Observatory Hill) was 9.8 °C, which is 0.8 °C above the long-term average at the former Observatory Hill site, or 0.1 °C above the average over recent decades.
  • The coldest morning was 7.9 °C on the 25th, and the warmest morning was on the 1st when the minimum temperature was 14.9 °C.

Coastal low formation during the end of the month

  • A low pressure system developed off the central parts of the New South Wales coast on the 24th, intensifying over the day, before weakening and moving away from the mainland over the next few days.
  • This coastal low brought significant two-day rainfall totals to Sydney in addition to generating well below average day-time temperatures on the 24th.

Further information

Media
(03) 9669 4057

Extremes in August 2021
Hottest day 28.6 °C at Penrith Lakes AWS on the 22nd
Warmest days on average 21.1 °C at Penrith Lakes AWS
Coolest days on average 11.9 °C at Mount Boyce AWS
Coldest day 2.8 °C at Mount Boyce AWS on the 24th
Coldest night -0.5 °C at Katoomba (Farnells Rd) on the 7th
Coolest nights on average 3.3 °C at Mount Boyce AWS
Warmest nights on average 11.4 °C at Sydney Harbour (Wedding Cake West)
Warmest night 16.3 °C at Norah Head AWS on the 23rd
16.3 °C at Terrey Hills AWS on the 23rd
Warmest on average overall 15.2 °C at Norah Head AWS
15.2 °C at Sydney (Observatory Hill)
Coolest on average overall 7.6 °C at Mount Boyce AWS
Wettest overall 98.2 mm at Randwick (Randwick St)
Wettest day 56.0 mm at Sans Souci (Public School) on the 25th
Strongest wind gust 102 km/h at Wattamolla AWS on the 24th

Record lowest August daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Badgerys Creek AWS 10.9 on the 24th 11.8 on the 22nd in 2008 26 19.2
Horsley Park Equestrian Centre AWS 10.8 on the 24th 11.9 on the 22nd in 2008 24 19.0



Summary statistics for August 2021
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
August
2021
Diff
from
average
Highest for
August
2021
Mean for
August
2021
Diff
from
average
Lowest for
August
2021
Total for
August
2021
Average
for
August
Rank of
August
2021
Fraction of
August
average
Badgerys Creek AWS 20.4 +1.2 27.7 22nd 4.4 -0.3 0.7 6th 49.8 36.7 high 136%
Bankstown Airport AWS 20.6 +1.6 27.6 22nd 6.5 +0.5 3.4 13th 65.6 49.9 high 131%
Camden Airport AWS 19.9 +0.8 27.3 22nd 3.8 -0.1 0.2 14th 42.0 41.2 high 102%
Campbelltown (Mount Annan) 20.4 +1.2 27.9 22nd 4.8 +0.2 1.3 13th 47.4 41.5 average 114%
Canterbury Racecourse AWS 20.0 +1.0 26.4 22nd 5.9 -0.5 2.8 16th 89.6 62.9 high 142%
Cooranbong (Lake Macquarie AWS) 20.8 +1.1 26.6 1st 4.8 -0.2 0.9 7th 64.8 48.6 high 133%
Gosford AWS 20.0   26.4 22nd 7.5   3.3 7th 72.2
Holsworthy Aerodrome AWS 19.8   27.0 22nd 6.1   2.6 19th 66.0
Holsworthy Defence AWS 19.4   26.5 22nd 6.4   3.1 14th 70.2
Horsley Park Equestrian Centre AWS 20.1 +1.1 26.8 22nd 6.2 -0.2 2.5 6th 60.0 39.1 high 153%
Katoomba (Farnells Rd) 13.1 +1.8 18.3 23rd 3.5 +0.2 -0.5 7th 70.6 78.6 high 90%
Mangrove Mountain AWS 19.2 +1.8 25.7 22nd 5.9 -0.6 2.0 7th 95.2 62.3 high 153%
Mount Boyce AWS 11.9 +0.6 19.5 22nd 3.3 +0.4 -0.4 13th 72.4 56.5 high 128%
Norah Head AWS 19.9 +1.0 26.8 1st 10.6 +0.1 8.6 6th 66.0 69.9 average 94%
Parramatta North (Masons Drive) 20.4 +1.3 26.7 22nd 8.3 +1.2 4.6 7th 76.8 55.9 high 137%
Penrith Lakes AWS 21.1 +1.2 28.6 22nd 5.3 -0.8 1.6 6th 45.6 30.4 high 150%
Richmond RAAF 20.6 +0.8 27.5 22nd 4.0 -0.4 -0.2 7th 51.4 32.4 high 159%
Sydney (Observatory Hill) 20.7   25.6 1st 9.8   7.9 25th 81.4
Sydney Airport AMO 20.4 +2.0 26.1 22nd 9.7 +1.5 7.4 29th 85.4 75.7 high 113%
Sydney Harbour (Wedding Cake West) 18.8 +0.9 24.1 1st 11.4 +0.3 8.5 25th
Sydney Olympic Park AWS (Archery Centre) 20.8   27.9 22nd 7.1   4.2 14th 68.6 68.1 high 101%
Terrey Hills AWS 18.6 +0.8 24.5 22nd 8.5 +0.2 4.9 7th 67.2 56.3 high 119%

Daily maximum temperatures for August 2021
12345678910111213141516171819202122232425262728293031
Badgerys Creek AWS23.719.419.815.719.421.019.215.418.921.825.020.319.620.120.923.019.219.421.623.823.927.727.110.917.219.520.819.316.520.322.6
Bankstown Airport AWS24.619.420.216.019.221.119.217.119.922.725.220.420.120.720.923.019.319.722.523.723.827.626.011.916.118.920.218.717.720.423.1
Camden Airport AWS22.718.519.315.018.420.218.715.319.022.224.319.619.719.820.421.419.419.021.823.223.627.325.411.316.418.919.718.715.820.222.5
Campbelltown (Mount Annan)22.819.020.115.419.421.019.715.819.822.224.720.820.320.821.021.719.719.222.023.823.727.925.811.116.419.320.218.516.620.722.5
Canterbury Racecourse AWS25.318.819.815.619.120.619.316.218.821.820.619.920.020.622.718.319.221.423.123.926.424.512.316.617.720.017.817.919.722.2
Cooranbong (Lake Macquarie AWS)26.619.322.016.820.920.918.816.119.922.823.921.720.120.822.622.719.319.321.723.921.026.525.412.517.519.019.118.220.920.123.6
Gosford AWS26.318.620.316.119.820.518.514.818.922.523.520.519.419.920.622.418.018.320.923.622.226.424.412.616.917.218.817.818.919.222.5
Holsworthy Aerodrome AWS23.818.119.115.018.720.318.716.518.521.724.120.119.319.720.221.918.618.921.522.823.027.025.011.415.818.519.217.716.219.522.2
Holsworthy Defence AWS22.217.718.314.217.619.918.415.319.021.823.619.619.219.520.421.418.418.721.322.622.826.525.010.815.617.419.118.415.720.122.2
Horsley Park Equestrian Centre AWS25.018.319.115.619.120.718.815.619.421.924.820.019.719.520.922.519.018.821.623.323.726.826.010.816.718.819.418.616.319.822.3
Katoomba (Farnells Rd)17.010.310.17.711.713.013.014.415.814.215.014.214.313.814.814.415.516.518.33.79.711.511.511.715.0
Mangrove Mountain AWS25.116.818.814.718.919.617.613.518.521.221.820.519.719.321.021.418.618.121.322.619.525.723.210.815.118.617.316.819.318.522.1
Mount Boyce AWS15.911.08.25.28.410.210.17.512.413.514.711.911.814.812.412.311.914.013.614.214.619.518.52.87.612.29.411.111.313.216.2
Norah Head AWS26.819.521.516.518.719.817.316.319.822.920.820.322.417.618.419.623.120.123.624.412.516.316.519.318.321.319.924.0
Parramatta North (Masons Drive)25.318.319.516.119.320.619.215.518.722.324.020.720.220.321.022.719.819.322.023.723.426.725.412.115.719.719.318.818.320.222.9
Penrith Lakes AWS25.719.219.816.220.121.219.114.320.422.425.921.521.320.522.023.920.319.922.424.725.428.626.412.817.620.221.618.917.321.024.0
Richmond RAAF26.619.020.516.220.620.719.413.619.222.725.020.620.719.621.923.519.519.322.423.624.327.526.312.617.218.920.118.117.019.923.6
Sydney (Observatory Hill)25.618.920.216.620.221.620.015.320.422.824.221.621.620.322.223.220.620.120.124.024.425.424.011.515.719.821.018.418.920.922.6
Sydney Airport AMO25.619.320.916.219.821.619.617.119.122.725.021.020.719.321.223.317.418.121.323.223.926.126.011.817.016.719.917.118.319.022.8
Sydney Harbour (Wedding Cake West)24.118.619.315.218.120.918.216.117.120.823.519.018.718.819.921.616.918.017.320.221.121.123.812.016.116.918.516.516.717.419.4
Sydney Olympic Park AWS (Archery Centre)25.618.720.316.619.721.519.616.219.623.324.520.621.019.821.623.219.820.223.223.824.127.924.813.016.218.620.518.719.020.823.6
Terrey Hills AWS23.717.319.115.018.119.217.214.317.920.522.618.619.019.119.721.217.016.620.622.220.624.523.510.014.416.418.817.116.818.4
Values are the maximum temperature, usually in the 24 hours from 9 am on the day indicated,
and typically occurred in the afternoon of that day.
Temperatures coloured according to their difference
from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period

Daily minimum temperatures for August 2021
12345678910111213141516171819202122232425262728293031
Badgerys Creek AWS6.92.18.45.63.30.71.35.95.03.03.311.11.41.82.43.07.12.52.23.68.24.16.18.48.13.73.87.92.51.72.5
Bankstown Airport AWS9.04.410.05.16.44.53.68.97.65.25.314.13.43.55.24.98.26.43.96.810.55.88.79.28.14.05.09.44.93.64.9
Camden Airport AWS4.70.67.75.29.61.20.82.54.81.81.28.80.30.21.56.07.30.70.82.67.33.55.08.77.93.11.69.61.50.51.0
Campbelltown (Mount Annan)6.23.89.35.86.12.62.96.85.33.62.911.81.31.52.67.04.01.51.94.28.14.27.18.47.12.82.610.03.22.02.4
Canterbury Racecourse AWS11.24.29.24.14.34.74.59.26.75.33.83.54.82.85.96.14.07.29.86.29.59.28.04.13.76.94.63.54.0
Cooranbong (Lake Macquarie AWS)5.35.87.26.39.23.40.93.79.13.25.19.11.31.62.41.02.41.81.34.57.14.29.010.99.24.66.54.51.92.03.5
Gosford AWS8.96.112.18.76.85.73.38.49.86.013.713.64.84.05.56.04.46.74.87.19.26.914.910.08.87.47.85.44.75.75.5
Holsworthy Aerodrome AWS9.74.89.94.97.42.84.37.76.13.96.213.73.83.64.73.97.74.92.65.39.65.69.78.77.24.24.810.13.33.13.6
Holsworthy Defence AWS9.23.810.07.67.04.56.66.86.25.26.112.25.03.15.25.57.64.13.76.010.16.011.07.96.44.06.28.24.54.84.4
Horsley Park Equestrian Centre AWS10.04.19.84.14.02.52.78.76.25.08.812.73.42.96.04.05.24.84.75.410.67.814.68.47.94.05.05.44.74.74.3
Katoomba (Farnells Rd)10.01.46.41.63.22.7-0.51.56.00.13.04.04.82.21.74.65.67.59.01.40.01.42.22.53.34.4
Mangrove Mountain AWS10.43.39.96.75.62.82.03.07.36.511.011.92.32.54.16.03.02.34.06.47.98.714.78.26.03.67.03.24.43.33.9
Mount Boyce AWS9.40.45.50.91.62.6-0.31.44.15.76.64.5-0.42.43.03.51.91.34.34.56.27.810.70.8-0.31.02.41.22.53.23.5
Norah Head AWS12.910.413.79.59.48.68.610.212.010.412.510.111.59.88.89.49.911.113.212.016.310.48.98.611.18.98.810.710.5
Parramatta North (Masons Drive)11.77.59.87.87.87.24.67.88.17.613.213.85.05.26.49.27.25.15.68.612.310.514.28.78.37.87.28.05.27.27.3
Penrith Lakes AWS7.63.79.28.83.51.62.25.37.64.25.510.42.83.43.22.34.13.23.65.710.35.77.89.38.84.36.53.93.43.44.4
Richmond RAAF6.72.57.87.21.80.1-0.23.77.02.85.012.30.40.22.54.51.30.31.82.89.63.77.89.18.32.14.32.72.81.52.3
Sydney (Observatory Hill)14.98.111.49.39.19.08.39.99.78.811.414.48.38.08.410.19.88.88.19.612.911.113.49.37.99.28.210.68.18.68.6
Sydney Airport AMO12.98.212.18.88.48.47.99.810.19.012.614.28.08.18.49.59.98.78.09.813.610.615.49.27.78.78.511.27.47.88.9
Sydney Harbour (Wedding Cake West)14.110.112.110.711.712.110.210.911.410.612.815.510.411.111.011.412.29.810.412.113.012.914.19.78.511.410.411.99.910.911.5
Sydney Olympic Park AWS (Archery Centre)10.75.69.66.75.55.14.79.28.36.29.014.54.44.25.84.46.55.65.07.210.66.911.59.48.55.55.47.55.64.95.6
Terrey Hills AWS12.67.010.97.56.86.24.97.78.310.311.712.36.76.97.08.27.26.26.88.811.512.716.38.07.07.87.06.96.47.77.5
Values are the minimum temperature, usually in the 24 hours to 9 am on the day indicated,
and typically occurred that morning.
Temperatures coloured according to their difference
from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period

Daily rainfall for August 2021
12345678910111213141516171819202122232425262728293031
Abbotsbury (Fairfield (City Farm)) - - 1.0 - - - - - - - - - - - - - - - - - - - - 29.0 27.0 - - - - - -
Abbotsford (Blackwall Point Rd) - - 4.0 - - - - 0.8 0.6 - - - - - - - - - - - - - - 35.0 34.0 - - - - - -
Audley (Royal National Park) - - 1.0 - - - - 5.0 1.0 - - - - - - - - - - - - - - 21.0 42.0 - - - - - -
Avalon Beach (Avalon (Palmgrove Rd)) - - 2.0 - - - - - 6.0 - - - - - - - - - - - 0.4 - - 29.2 16.0





Badgerys Creek AWS - - 1.4 - - - - - 0.8 - - - - - - - - - - - - - - 26.0 21.6 - - - - - -
Bankstown Airport AWS - - 1.8 0.2 - - - - 0.8 0.2 - - - - - - - - - - - - - 29.0 33.4 0.2 - - - - -
Baulkham Hills Eucalyptus Ct - - 3.5 0.5 - - - - 1.0 - - - - - - - - - - - - - - 30.0 27.5 - - - - - -
Belrose (Evelyn Place) - - 3.2 - - - - 1.4 - - - - - - - - - - - - 0.6 - - 34.6 32.6 - - - - 0.2
Bilpin Post Office 0.2 6.8 - - - - 6.6 - - - - - - - - - - - - - - 32.0 19.0 - - - 0.2 -
Blackheath (Wombat Street) - 1.0 6.0 1.0 - - - - 10.0 - - 9.0 - - - - - - - - - - - 37.0 21.0 11.0 - - - - -
Box Hill (McCall Gardens) - - 4.0 - - - - - 1.0 - - - - - - - - - - - - - - 26.0 21.0 - - - - - -
Bringelly (Maryland) - - 1.0 - - - - - - - - - - - - - - - - - - - - 25.0 21.0 - - - - - -
Camden (Brownlow Hill) - - 1.6 - - - - - 0.2 - - - - - - - - - - - - - - 21.0 13.4





Camden Airport AWS - - 1.2 - - - - - - - - - - - - - - - - - - - - 23.0 17.8 - - - - - -
Campbelltown (Kentlyn (Georges River Roa - - 1.0 - - - - - - - - - - - - - - - - - - - - 25.0 37.0 - - - - - -
Campbelltown (Mount Annan) 0.2 - 1.0 0.2 - - - - - - - - - - - - - - - - - - - 23.8 22.0 - - - - 0.2 -
Canterbury Racecourse AWS - - 3.6 - - - - 0.8 0.8 -


- - - - - - - - - - 36.8 47.4 - - - - - 0.2
Castle Cove (Rosebridge Ave) - - 5.0 - - - - 6.0 3.6 - - - - - - - - - - - 0.5 - - 30.0 48.0





Chatswood Bowling Club -
- 1.0 -
- - 1.0 - - - - - - - - - - - - - - 1.0 14.0 -
-
- -
Collaroy (Long Reef Golf Club) - - 3.2 - - - - - 3.0 - - - - - - - - - - - 0.4 - - 25.2 22.8





Colo Heights (Mountain Pines) - - 2.4 - - - - - 4.6 0.2 - - - - - - - - - - - - - 32.0 28.0 - - - - - -
Concord (Brays Rd) - - 3.6 - - - - 0.8 1.0 - - - - - - - - - - - - - - 35.6 36.0





Concord Golf Club - - 3.6 - - - - - 1.4 - - - - - - - - - - - - - - 35.0






Cooranbong (Lake Macquarie AWS) - - 1.6 - - - - - 1.4 - - - - - - - - - - - 1.4 0.2 - 37.8 22.0 - - - - 0.4 -
Darkes Forest (Kintyre) - - 2.0 - - - - 2.0 1.0 - - - - - - - - - - - - - - 24.0 35.0 - - - - - -
Dover Heights (Portland St) - - 4.0 - - - - 1.6 0.4 - - - - - - - - - - - 0.2 - - 29.2 48.8 - - - - 0.2 -
Erskine Park Reservoir - - 2.0 - - - - - - - - - - - - - - - - - - - - 28.0 20.0 - - - - - -
Faulconbridge (Great Western Hwy) - - 3.0 - - - - - 5.0 - - - - - - - - - - - - - - 24.0 13.0 - - - - - -
Faulconbridge (St Georges Crescent) - 0.2 3.2 - - - - - 6.8 - - 0.2 - - - - - - - - - - - 25.8 14.8 0.2 - - - - -
Gears (Wyong River) -


- - - - 1.0 - - - - - - - - -
- - -
1.0 - - - -
- -
Gosford AWS - - 0.8 - - - - - 4.4 - - - - - - - - - - - 0.4 - - 43.6 23.0 - - - - - -
Holsworthy Aerodrome AWS - - 1.0 0.2 - - - - 0.4 - 0.2 - - - - - - - - - - - - 26.6 37.4 - - - - 0.2 -
Holsworthy Defence AWS - - 1.4 - - - - 0.2 0.4 - - - - - - - - - - - - - - 26.0 42.0 - - - 0.2 - -
Horsley Park Equestrian Centre AWS -
1.8 - - - - - 0.2 - - - - - - - - - - - - -
29.2 28.8 - - - - - -
Katoomba (Farnells Rd) - 1.6 3.2 0.6 - - - - - - - 9.2 - - - - -
- - - 32.4 23.0 0.4 - - - 0.2 -
Kurrajong Heights (Bells Line of Road) - - 5.2 - - - - - 6.2 - - - - - - - - - - - - - - 34.0 19.0





Lower Portland (Hawkesbury River) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Lucas Heights (ANSTO) - - 1.4 - - - - 1.0 1.0 - - - - - - - - - - - - - - - 41.0 - - - -

Mangrove Mountain AWS - - 2.6 - - - - - 6.0 - - - - - - - - - - - 2.4 0.2 - 35.0 48.8 - - - - 0.2 -
Marrickville Golf Club - - 3.0 - - - - 1.0 - - - - - - - - - - - - - - - 32.0 43.0 - - - - 1.0 -
Menangle Bridge (Nepean River) - - 1.0 - - - - - - - - - - - - - - - - - - - - 21.0 24.0 - - - - - -
Mona Vale Golf Club - - 2.6 - - - - 1.8 5.0 0.2 - - - - 0.2 - - - 0.2 - 0.6 - - 33.8 22.2 - - - 0.2 - -
Mount Boyce AWS - 0.8 5.4 0.4 - - 0.2 - 9.2 - 0.2 5.8 - 0.2 - 0.2 - - - - - - - 31.0 13.2 5.6 - - - - 0.2
Mount Wilson (Clarine) - 1.0 5.8 0.6 - - - - 12.6 - - 2.6 - - - - - - - - - - - 24.6 24.0 - - - - - -
Norah Head AWS - - 1.4 - - - - 1.4 3.6 - -


- - - - - - 0.8 - - 40.4 18.4 - - - - - -
North Parramatta (Burnside Homes) - - 3.0 - - - - - 0.5 - - - - - - - - - - - - - - 33.0 28.0 - - - - - -
North Rocks (Muirfield Golf Club) - - 3.5 - - - - 0.5 0.5 - - - - - - - - - - - - - - 28.5 24.5 - - - - - -
North Ryde Golf Club - - 3.0 - - - - - 1.0 - - - - - - - - - - - - - - 35.0 30.0 - - - - - -
Palm Grove (Lyrebird Lane) - - 2.0 - - - - - 5.0 - - - - - - - - - - - 1.0 - - 29.0 39.0 - - - - - -
Parramatta North (Masons Drive) - - 4.0 - - - - 0.4 1.0 - - - - - - - - - - - - - - 34.0 37.0 - - - - 0.4 -
Peakhurst Golf Club - - 1.0 - - - - 2.0 1.0 - - - - - - - - - - - - - - 29.0 49.0 - - - - - -
Penrith Lakes AWS - - 3.2 - - - - - 0.4 0.2 - - - - - - - - - - - - - 24.2 17.4 - 0.2 - - - -
Prospect Reservoir - - 3.0 - - - - - - - - - - - - - - - - - - - - 35.0 23.0 - - - - - -
Putty (The Gibba) - - 4.0 - - - - - 2.0 - - - - - - - - - - - - - - 34.0 24.0 - - - - - -
Randwick (Randwick St) - - 3.6 - - - - 1.2 2.2 - - - - - - - - - - - 0.2 - - 36.6 54.2 - - - - 0.2
Richmond RAAF - - 4.2 - - - - - 0.4 - - - - - - - - - - - - - - 27.2 19.6 - - - - - -
Rose Bay (Royal Sydney Golf Club) - - 3.6 - - - - 1.8 - - - - - - - - - - - - 0.2 - - 33.0 45.8 0.1 - - - 0.2 -
Sans Souci (Public School) - - 1.0 - - - - 3.0 - - - - - - - - - - - - - - - 22.0 56.0 - - - - - -
Seven Hills (Radio FM 103.2) - - 3.0 - - - - - - - - - - - - - - - - - - - - 31.0 25.5 - - - - - -
Shanes Park (South Creek Road) - - 4.0 - - - - - 1.4 - 0.2 - - - - - - - - - - - - 31.2 23.0 - - 0.2 - - -
Sydney (Observatory Hill) - - 3.4 - - - - 0.8 4.6 - 0.2 - - - - - - - - - - - - 32.6 39.8 - - - - - -
Sydney Airport AMO - - 2.8 - - - - 1.6 1.0 0.2 - - - - - - - - - - - 0.2 - 27.0 52.6 - - - - - -
Sydney Botanic Gardens - - 4.0 - - - - 1.0 4.8 - - - - - - - - - - - - - - 32.4 45.5 0.1 - - - - -
Sydney Olympic Park AWS (Archery Centre) - - 3.2 - - - - - 0.6 - - - - - - - - - - - - - - 35.0 29.8 - - - - - -
Terrey Hills AWS - - 3.0 - - - - 1.4 1.4 - - - - - - - - - - - 0.4 - - 31.0 30.0 - - - - - -
Wahroonga (Ada Avenue) - - 4.8 - - - - 0.4 2.2 - - 0.2 - - - - - - - - 0.6 - - 40.0 35.0 - - - - 0.4 -
Warragamba - - 1.0 1.0 - - - - 1.0 - - - - - - - - - - - - - - 26.0 15.0 - - - - - -
Wedderburn (Booalbyn) - - 2.0 - - - - - - - - - - - - - - - - - - - - 23.0 25.0 - - - - - -
Wyong (Kulnura (Jeavons)) - - 2.0 - - - - - 4.0 - - - - - - - - - - - 4.0 - - 37.0 40.0 - - - - - -
Wyong (Mount Elliot) - - 1.0 - - - - 1.0 11.0 - - - - - - - - - - - - - - 46.0 18.0 - - - - - -
Wyong (Olney Forest) - - 3.0 - - - - - 5.0 - - - - - - - - - - - 3.0 - - 33.0 31.0 - - - - - -
Yarramalong (Lewensbrook) - 0.6 2.0 - - - - - 3.4 - - - - - - - - - - - 4.0 - - 37.0 34.0 - - - - - -
Most values are the precipitation in the 24 hours to 9 am on the day indicated. Days marked with → are part of a longer accumulation, which is shown on the final day.
Values over 100 mm have been rounded to the nearest whole millimetre.
Days marked with - have a rainfall report of zero; days left blank have no rainfall report (which often indicates no rain fell).
Rainfalls coloured
according to the amount
0 1.0 5.0 10.0 15.0 25.0 50.0 100 150 200 300 400 600 millimetres

Notes

The Monthly climate summary, generally published on the first working day of each month, lists the main features of the weather in Greater Sydney using the most timely and accurate information available on the date of publication; it will generally not be updated. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

This summary includes data from observing sites in or near the Greater Sydney “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to “include the population within the urban area of the city, as well as people who regularly socialise, shop or work within the city, and live in small towns and rural areas surrounding the city. It is important to note that GCCSAs do not define the built up edge of the city. They provide a stable definition for these cities and are designed for the output of a range of social and economic survey data.

This statement has been prepared based on information available at 10 am on Wednesday 1 September 2021. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

Averages for individual sites are long-term means based on observations from all available years of record, which vary widely from site to site. They are not shown for sites with less than 10 years of record, as they cannot then be calculated reliably.
The median is sometimes more representative than the mean of long-term average rain.

The Rank indicates how rainfall this time compares with the climate record for the site, based on the decile ranking (very low rainfall is in decile 1, low in decile 2 or 3, average in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of average shows how much rain has fallen this time as a percentage of the long-term mean.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Further information

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