Greater Melbourne in September 2021: warm days and nights, above average rainfall

Rainfall totals for September were above average at most sites in Greater Melbourne. Daytime and night-time temperatures were generally warmer than average, despite some cold days and nights.

Above average rainfall

  • Rainfall totals for September were above average at most sites in Greater Melbourne.
  • Most of the monthly rainfall was recorded on the 4th, 5th and 21st, associated with the cold fronts that crossed the city.
  • Coldstream, Cape Schanck and Viewbank had their highest September daily rainfall on record on the 4th.
  • The 60.4 mm recorded at Warburton on the 4th was the highest daily rainfall total in Greater Melbourne this month; it was also the second-highest daily rainfall total in September in over 100 years of records at the site, after 64.6  mm on 5 September 2010.
  • Rainfall totals ranged from 77% of average at Scoresby Research Institute to 167% of average at Viewbank.
  • Melbourne (Olympic Park) reported rainfall on 13 days, which was close to the city's September average of 15.

Warm days and nights

  • Mean daytime temperatures were warmer than average at all reporting sites in Greater Melbourne and ranged from 0.2 °C above average at Ferny Creek to 1.2 °C above average at Essendon Airport.
  • The warmest day for the month was on the 2nd when daily maximum temperatures above 25 °C were recorded in most suburbs.
  • The highest temperature recorded in Greater Melbourne was 26.6 °C at Melbourne (Olympic Park) and Cerberus on the 2nd.
  • Mean minimum temperatures were warmer than average in most suburbs.
  • The warmest night this month was on the 3rd, and several sites had their warmest September night (highest daily minimum temperature) on record.
  • The highest daily minimum temperature in Greater Melbourne this month, 21.7 °C, was recorded at Moorabbin Airport on the 3rd.
  • Melbourne (Olympic Park) had daily minimum temperature of 20.1 °C on the 3rd; this was the second highest daily minimum temperature recorded for September in the city, after 20.5 °C on the 29 September 1999.

Melbourne (Olympic Park)

  • Total rainfall for Melbourne (Olympic Park) was 68.6 mm.
  • The mean daily maximum temperature for Melbourne (Olympic Park) was 18.2 °C.
  • The warmest day was 26.6 °C on the 2nd, and the coolest day was on the 25th when the temperature reached 12.8 °C.
  • The mean daily minimum temperature for Melbourne (Olympic Park) was 9.6 °C.
  • The coldest morning was 4.5 °C on the 16th, and the warmest morning was on the 3rd when the minimum temperature was 20.1 °C.

Strong winds and hail

  • This month, the strongest wind gust of 113 km/h was recorded at Fawkner Beacon on the 3rd.
  • Small hail was observed on the 20th in several Melbourne suburbs as a cold front crossed the city and produced strong winds and rain.

Further information

Media
(03) 9669 4057

Extremes in September 2021
Hottest day 26.6 °C at Cerberus on the 2nd
26.6 °C at Melbourne (Olympic Park) on the 2nd
Warmest days on average 18.3 °C at Viewbank
Coolest days on average 13.9 °C at Wallan (Kilmore Gap)
Coldest day 9.0 °C at Wallan (Kilmore Gap) on the 21st
9.0 °C at Wallan (Kilmore Gap) on the 25th
Coldest night -0.2 °C at Coldstream on the 27th
Coolest nights on average 5.7 °C at Wallan (Kilmore Gap)
Warmest nights on average 9.6 °C at Melbourne (Olympic Park)
Warmest night 21.7 °C at Moorabbin Airport on the 3rd
Warmest on average overall 13.9 °C at Melbourne (Olympic Park)
Coolest on average overall 9.8 °C at Wallan (Kilmore Gap)
Wettest overall 172.2 mm at Toolangi (Mount St Leonard DPI)
Wettest day 60.4 mm at Warburton (O'Shannassy Reservoir) on the 4th
Strongest wind gust 113 km/h at Fawkner Beacon on the 3rd

Record highest September daily rainfall
New record
(mm)
Old
record
Years of
record
Coldstream 32.6 on the 4th 31.4 on the 29th in 2011 27
Cape Schanck 38.0 on the 4th 32.0 on the 13th in 2020 22
Viewbank 43.0 on the 4th 36.4 on the 29th in 2011 22



Record highest September daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Scoresby Research Institute 20.7 on the 3rd 20.3 on the 21st in 2019 56 7.6
Essendon Airport 18.6 on the 3rd 18.3 on the 21st in 2019 52 6.8
Moorabbin Airport 21.7 on the 3rd 20.1 on the 29th in 1999 51 8.1
Viewbank 20.7 on the 3rd 20.2 on the 21st in 2019 22 7.8



Summary statistics for September 2021
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
September
2021
Diff
from
average
Highest for
September
2021
Mean for
September
2021
Diff
from
average
Lowest for
September
2021
Total for
September
2021
Average
for
September
Rank of
September
2021
Fraction of
September
average
Cerberus 17.3 +0.8 26.6 2nd 7.9 +0.3 1.6 14th 72.0 67.6 average 107%
Coldstream 17.8 +0.5 24.7 2nd 6.5 +1.0 -0.2 27th 83.2 69.8 average 119%
Essendon Airport 18.1 +1.2 25.1 2nd 8.2 +1.4 2.6 27th 71.0 50.8 high 140%
Ferny Creek 14.1 +0.2 21.2 2nd 6.8 +0.1 1.3 21st 119.8 100.5 high 119%
Frankston (Ballam Park) 17.2   25.7 2nd 8.5   4.1 27th 85.0
Laverton RAAF 18.1 +1.0 25.4 2nd 7.6 +0.9 1.9 27th 60.8 48.3 high 126%
Melbourne (Olympic Park) 18.2   26.6 2nd 9.6   4.5 16th 68.6
Melbourne Airport 17.9 +1.1 24.5 2nd 7.3 +0.2 1.8 26th 67.0 46.5 high 144%
Moorabbin Airport 18.0 +1.0 26.3 2nd 8.8 +0.7 2.9 16th 79.8 64.1 high 124%
Scoresby Research Institute 17.7 +1.1 25.2 2nd 7.8 +0.2 1.0 15th 63.0 81.9 average 77%
Viewbank 18.3 +0.6 25.7 2nd 8.1 +0.3 1.9 16th 93.4 55.9 high 167%
Wallan (Kilmore Gap) 13.9 +0.7 20.3 11th 5.7 0.0 1.7 21st 95.0 60.2 high 158%

Daily maximum temperatures for September 2021
123456789101112131415161718192021222324252627282930
Cerberus23.526.622.314.413.614.714.619.223.019.519.314.914.014.815.316.820.715.316.512.813.715.218.917.213.414.419.620.418.417.3
Coldstream23.024.724.013.414.115.415.418.022.118.321.715.815.216.416.617.820.016.916.213.313.617.219.118.113.116.119.122.419.617.1
Essendon Airport22.725.123.013.914.115.616.220.124.618.822.915.714.214.915.516.922.017.318.113.713.318.920.818.713.714.919.022.718.618.3
Ferny Creek19.921.220.411.010.312.111.315.419.416.717.212.511.512.012.013.316.112.211.910.610.012.615.913.39.411.815.418.116.014.5
Frankston (Ballam Park)23.125.722.214.114.214.615.618.222.419.418.814.414.815.015.416.020.214.916.412.913.415.818.816.313.314.618.721.117.718.7
Laverton RAAF22.825.423.314.014.316.316.421.525.018.122.416.313.714.214.816.120.916.618.913.614.018.121.518.613.213.920.021.817.918.0
Melbourne (Olympic Park)23.526.623.014.113.615.516.220.825.818.822.816.214.314.115.916.022.216.218.013.813.217.821.518.812.815.419.423.019.318.1
Melbourne Airport22.324.523.313.313.915.515.620.424.319.723.315.413.914.714.816.920.516.517.714.013.219.120.618.213.514.518.822.617.918.0
Moorabbin Airport23.926.324.514.314.015.115.120.225.119.221.514.613.914.415.715.721.415.417.713.816.219.617.312.915.320.221.919.318.8
Scoresby Research Institute23.425.223.814.015.215.419.323.420.521.715.714.815.615.617.219.915.616.213.512.517.419.817.612.915.5
Viewbank23.725.724.214.213.515.915.618.524.619.022.716.414.715.915.918.221.217.117.213.413.218.420.218.713.316.119.523.719.118.6
Wallan (Kilmore Gap)17.419.318.09.69.711.511.614.019.014.720.312.310.111.712.013.616.013.313.111.59.015.415.014.99.011.914.418.614.115.4
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 September 2021
123456789101112131415161718192021222324252627282930
Cerberus5.59.517.510.09.19.66.16.811.48.69.59.55.41.62.72.05.811.58.210.16.310.110.711.35.34.71.85.37.812.7
Coldstream5.27.719.410.17.66.37.38.512.16.212.55.74.80.41.2-0.11.811.43.39.54.58.15.26.43.70.3-0.21.411.312.5
Essendon Airport8.614.618.69.36.17.18.17.011.29.612.18.35.75.13.94.54.410.96.69.55.17.79.19.95.24.72.64.811.912.6
Ferny Creek10.315.117.76.94.65.16.26.18.87.48.74.53.33.53.63.37.28.44.25.61.35.97.87.52.43.05.38.311.410.9
Frankston (Ballam Park)8.614.217.29.86.76.06.69.811.37.911.99.65.55.56.64.96.710.38.19.65.69.910.88.04.44.54.17.111.512.5
Laverton RAAF6.714.818.48.96.66.88.15.611.37.612.16.65.13.93.32.65.19.66.89.15.48.56.98.24.63.21.96.610.912.5
Melbourne (Olympic Park)9.815.020.110.18.39.110.59.712.211.413.210.37.15.55.34.57.112.18.710.76.37.910.011.07.15.05.17.712.613.1
Melbourne Airport10.513.317.18.55.66.56.95.69.87.011.86.34.83.92.72.95.08.65.18.24.88.68.110.13.61.81.96.610.812.3
Moorabbin Airport7.216.121.710.59.08.98.810.012.08.712.49.86.33.83.82.93.911.57.710.36.69.810.610.57.03.33.14.910.312.9
Scoresby Research Institute6.516.020.79.85.77.49.811.97.312.48.95.52.11.01.15.611.97.19.74.68.27.810.94.91.53.9
Viewbank7.712.720.79.87.98.28.58.711.69.612.68.85.94.12.11.94.111.37.39.55.37.57.911.14.81.92.34.511.312.6
Wallan (Kilmore Gap)6.711.114.26.33.84.75.25.15.87.08.35.53.23.63.53.65.47.33.74.61.74.26.56.42.41.94.36.69.59.4
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 September 2021
123456789101112131415161718192021222324252627282930
Bonbeach (Carrum (Patterson River Countr - - - 40.2 - - - - 7.6 - - - - - - 8.2 8.5 - - - 4.2 - - 4.5
Bullengarook East - - 0.8 40.2 3.0 0.8 - - - - - - 12.5 2.8 0.2 0.2 - 5.8 1.6 7.0 0.4 - 0.2 - 1.6 2.8 - - 0.2 7.8
Burnside - - - 32.2 - 4.0 - - - - - - 5.0 10.0 - - - - 1.0 - 7.0 0.3 - - - - - - - 4.8
Cape Schanck - - 7.2 38.0 - - 8.6 - - - - - 3.2 - - - - 2.8 1.4 - 5.2 - - - 3.2 0.6 - - - 14.6
Cerberus - - - 32.4 3.4 3.6 0.2 1.0 - - - - 3.0 - - - - 5.2 0.4 2.4 5.2 2.4 - - 5.6 0.4 - - - 6.8
Cheltenham Kingston Centre - - - 30.0 3.0 3.2 - - - - - - 9.0 0.4 - - - 2.0 0.8 2.0 8.0 0.2 - - 0.2 0.1 - - - 1.8
Coldstream - - - 32.6 7.6 4.0 0.2 - - - - - 3.6 0.2 - - - - 0.2 9.6 13.6 4.0 0.2 - 1.2 0.8 - - - 5.4
Eltham - - - 34.4 14.0 2.2 0.2 0.2 - - - - 3.4 0.4 - - - 0.4 1.4 4.2 13.6 2.6 - - 1.0 - - - 0.4 5.6
Essendon Airport - - - 33.2 11.8 1.6 0.2 0.6 - - - - 4.6 0.2 - - - 0.2 0.8 1.0 10.0 0.6 0.2 - 0.2 0.4 - - - 5.4
Ferny Creek - - - 36.0 14.8 5.2 0.4 -
- - 0.2 4.4 0.4 - - - 2.2 2.2 13.2 18.8 4.2 0.2 0.2 6.6 2.0 - - - 8.8
Frankston (Ballam Park) - - - 37.4 4.6 2.2 - - - - - - 6.8 - - - - 8.2 2.6 1.2 12.8 2.8 0.2 - 5.8 0.4 - - - -
Greenvale Reservoir - - - 31.4 18.0 0.6 - - - - - - 8.4 -

0.2
1.4 0.8 6.6 1.8 0.2 0.2 0.2 0.8 - 0.2 0.2 5.2
Hesket (Straws Lane) - - - 40.6 6.8 0.2 - - - - - 4.6 5.4 - - - 4.6 - 5.6 3.4 0.6 0.2 0.2 0.8 1.6 - - - 5.8
Kinglake West - - - 34.4 51.0 8.4 0.8 0.4 - - - - 8.4 3.0 - - - 9.2 0.6 7.0 14.2 7.6 - - 1.6 - - - 0.8 6.6
Kinglake West (Wallaby Creek) - - - 30.4 47.0 4.4 0.2 - - - - 0.2 8.2 0.6

0.2
2.4 7.4 9.2 6.0 1.0 0.2 2.0 - 0.2 0.2 0.2 7.6
Lancefield - - - 38.2 3.0 - - - - - - - 1.2 3.0 - - - 9.2 0.4 6.4 3.4 - -






Laverton RAAF - - - 32.4 4.2 0.4 - - - - - - 8.8 1.8 - - - 0.2 0.4 0.2 7.4 0.4 0.2 - 0.4 - - - - 4.0
Melbourne (Olympic Park) - - - 38.2 9.6 1.0 - - - - - - 5.6 0.2 0.2 - - 0.8 0.8 0.4 8.0 0.2 - - - 0.2 - - - 3.4
Melbourne Airport - - - 31.2 14.2 0.2 0.2 - - - - - 4.8 1.2 0.2 - 0.2 0.2 1.6 0.6 6.4 0.4 - - 0.2 - 0.2 - - 5.2
Melbourne Botanical Gardens - - - 38.0 10.8 1.6 - 0.2 - - - - 5.8 - - - - 1.2 1.0 0.6 9.0 - - - 0.2 0.4 0.2 - - 3.6
Mitcham - - - 24.0 7.6 4.6 - - - - - - 3.2 1.2

-
0.8 3.8 16.2 2.2 0.2 - 0.2 0.2 - - - 4.6
Monbulk (Spring Road) - - - 25.0 16.0 6.6 - - - - - 0.5 2.8 - - - - 4.0 2.6 16.6 29.6 2.8 - - 6.0 - - - - 9.0
Moorabbin Airport - - - 41.4 8.4 1.0 - - - - - - 11.8 0.8 - - - 3.6 0.6 0.6 5.8 0.4 - - 0.8 0.6 - - - 4.0
Mount Waverley (Riversdale Golf Club) - - - 33.5 6.5 4.0 - - - - - - 5.0 2.4 - - - - 2.0 2.0 12.0 5.2 0.1






Newham (Cobaw) - - - 40.2 - - - - - - - - 0.6 1.0 - - - 7.2 - 9.6 2.6 - - - - - - - - 8.4
Oakleigh (Metropolitan Golf Club) - - - 38.9 9.8 2.9 - - - - - - 9.4 - - - - 5.4 2.4 14.8 - - - 0.4 - - 5.8
Preston Reservoir - - - 34.2 11.2 3.0 0.2 0.4 - - - - 9.2 0.6

-
0.8 2.4 13.4 1.6 - - 1.2 0.4 - - 0.2 4.2
Romsey - - - 34.4

























Rosebud (Country Club) - - 2.2 36.6 1.8 0.4 - - - - - - 4.6 - - - - 5.4 6.0 5.2 - - 8.8 2.0 - - - 6.0
Scoresby Research Institute - - - 28.6 5.8 3.0 - - - - - - 4.4 0.6 - - - 1.8 1.4 4.2 9.6 0.8 0.2 - 2.0 0.6 -


Springvale (Sandown) - - 36.6 3.0 2.2 1.2 - - - - - 10.0 4.0 - - - 3.0 2.6 1.6 5.4 3.4 - - - 1.2




Springvale Necropolis - - - 45.0 - - - 13.0 - - - - - - - 18.0








Toolangi (Mount St Leonard DPI) - - - 115 - 1.0 - - 7.8 - - - - 16.6 18.4 4.6 - - 6.2 - 0.8 2.0
Toorourrong Reservoir (Toorourrong) - - - 26.8 38.2 2.0 - - - - - - 5.2 1.2

-
0.4 6.2 6.6 4.6 0.2 0.2 1.0 - - 0.2 - 6.8
Upper Plenty - - - 32.0 30.4 2.4 0.2 - - - - - 5.2 0.8 - - - 4.2 0.6 - 6.2 5.0 0.4 - 0.8 0.2 - - - 5.0
Viewbank - - - 43.0 16.4 1.6 - - - - - - 6.4 0.6 0.2 - - 0.2 1.2 3.0 12.2 2.8 - - - - 0.2 - 0.2 5.4
Wallan - - - 35.0 23.4 2.0 - - - - - - 5.0 2.2 - - - - 2.6 1.4 6.2 3.6 - - 1.0 1.2 - - 0.8 6.2
Wallan (Kilmore Gap) - - - 37.0 25.2 2.0 - - 0.2 - - - 3.8 1.4 0.2 - 0.2 3.6 0.6 0.6 5.4 5.0 0.2 - 1.8 0.6 0.2 - - 7.0
Warburton (O'Shannassy Reservoir (Quarte - - 1.0 60.4 5.0 7.0 - - - - - - 7.4 - 60.0


7.0 3.6 - - - -
Willowmavin (Avalon Station) - - - 31.6 9.2 0.6 0.2 - 0.2 - - - 0.2 1.0 - 0.2 0.2 11.0 - 3.2 3.8 0.4 - 0.2 0.2 0.4 - 0.2 - 18.6
Woodend - - - 41.4 0.6 1.4 0.2 - - - - 0.2 3.0 5.6 - 0.2 0.2 4.4 - 7.6 1.8 - 0.2 0.2 0.2 1.2 - - - 4.4
Yan Yean - - - 24.0 27.4 3.2 - - - - - - 15.6 0.6

-
6.0 0.8 6.2 4.4 - - 0.4 0.2 - - 0.2 5.6
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 Melbourne 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 Melbourne “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 4 pm on Friday 1 October 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

Media
(03) 9669 4057

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