Greater Melbourne in September 2020: warm days and nights; mostly dry

Rainfall totals for September were mostly below average across Greater Melbourne. Daytime and night-time temperatures were warmer than average at all reporting sites despite some cold days and nights.

Rainfall mostly below average

  • Rainfall totals in September were below average in most Melbourne suburbs.
  • Most of the rainfall was recorded on the 12th, 13th, and between the 23rd and 26th.
  • Cerberus and Cape Schanck had their highest September daily rainfall on record on the 13th.
  • The 42.4 mm recorded at Cerberus on the 13th was also the highest daily rainfall total in Greater Melbourne this month.
  • Rainfall totals for September ranged from 58% of average at Essendon Airport to 131% of average at Cerberus.
  • Melbourne city (Olympic Park) reported rainfall on 11 days, which is fewer than the September average for the city.

Warm days and nights

  • Mean daytime temperatures were warmer than average across Greater Melbourne during September.
  • Melbourne's warmest day for the month was on the 19th, when maximum daily temperatures above 25 °C were recorded in most suburbs.
  • The highest temperature recorded in Greater Melbourne was 26.6 °C at Moorabbin Airport on the 19th.
  • Despite the generally mild weather, there were some cold days this September; particularly cold and windy conditions were experienced on the 25th with daily maximum temperatures below 12 °C at most reporting sites.
  • The lowest daytime temperature recorded in Greater Melbourne during the month was 7.1 °C at Ferny Creek on the 25th.
  • Melbourne (Olympic Park) reached 11.9 °C on the 25th, the coldest late September day since 11.9 °C was recorded on 28 September 2002.
  • Mean minimum temperatures were much warmer than average in most suburbs, and ranged from 0.6 °C above average at Wallan (Kilmore Gap) to 2.3 °C above average at Essendon Airport.

Melbourne (Olympic Park)

  • Total rainfall for Melbourne (Olympic Park) was 33.6 mm.
  • The mean daily maximum temperature for Melbourne (Olympic Park) was 18.1 °C.
  • The warmest day was 26.3 °C on the 19th, and the coolest day was on the 25th when the temperature reached 11.9 °C.
  • The mean daily minimum temperature for Melbourne (Olympic Park) was 9.8 °C.
  • The coldest morning was 4.3 °C on the 29th, and the warmest morning was on the 20th when the minimum temperature was 17.1 °C.

Strong winds

  • Melbourne experienced strong northerly winds on the 7th and 8th, associated with a vigorous cold front; the strongest wind gust this month, 96 km/h, was recorded at Melbourne Airport on the 7th. State Emergency Services received more than 400 calls, for fallen trees and building damage, mostly in Dandenong Ranges, Pakenham and Upper Yarra, while thousands of homes were left without power.

Further information

Media
(03) 9669 4057

Extremes in September 2020
Hottest day 26.6 °C at Moorabbin Airport on the 19th
Warmest days on average 18.2 °C at Viewbank
Coolest days on average 13.8 °C at Wallan (Kilmore Gap)
Coldest day 7.1 °C at Ferny Creek on the 25th
Coldest night -0.3 °C at Coldstream on the 1st
Coolest nights on average 6.2 °C at Wallan (Kilmore Gap)
Warmest nights on average 9.8 °C at Melbourne (Olympic Park)
Warmest night 17.1 °C at Melbourne (Olympic Park) on the 20th
Warmest on average overall 13.9 °C at Melbourne (Olympic Park)
Coolest on average overall 10.0 °C at Wallan (Kilmore Gap)
Wettest overall 120.4 mm at Main Ridge
Wettest day 42.4 mm at Cerberus on the 13th
Strongest wind gust 96 km/h at Melbourne Airport on the 7th

Record highest September daily rainfall
New record
(mm)
Old
record
Years of
record
Cerberus 42.4 on the 13th 27.6 on the 12th in 2004 31
Cape Schanck 32.0 on the 13th 22.6 on the 26th in 2009 21



Summary statistics for September 2020
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
September
2020
Diff
from
average
Highest for
September
2020
Mean for
September
2020
Diff
from
average
Lowest for
September
2020
Total for
September
2020
Average
for
September
Rank of
September
2020
Fraction of
September
average
Cerberus 17.4 +1.0 24.4 19th 8.3 +0.7 0.2 29th 88.2 67.4 high 131%
Coldstream 18.1 +0.9 25.6 19th 6.4 +0.9 -0.3 1st 65.0 69.3 average 94%
Essendon Airport 18.1 +1.3 26.0 19th 9.1 +2.3 2.6 29th 29.2 50.5 low 58%
Ferny Creek 14.4   21.9 19th 7.0   1.4 26th 74.0
Frankston (Ballam Park) 17.4   24.6 19th 9.0   3.8 29th 71.6
Laverton RAAF 18.0 +0.9 26.4 19th 8.5 +1.8 1.4 29th 38.4 48.2 average 80%
Melbourne (Olympic Park) 18.1   26.3 19th 9.8   4.3 29th 33.6
Melbourne Airport 17.7 +1.0 25.2 19th 8.1 +1.0 2.2 29th 27.8 46.1 low 60%
Moorabbin Airport 18.0 +1.1 26.6 19th 9.2 +1.1 2.4 29th 51.4 63.8 average 81%
Scoresby Research Institute 17.9 +1.3 25.2 19th 8.4 +0.8 1.5 29th 57.0 82.2 low 69%
Viewbank 18.2 +0.5 25.3 19th 8.5 +0.8 1.6 29th 42.6 54.1 average 79%
Wallan (Kilmore Gap) 13.8 +0.6 20.7 19th 6.2 +0.6 0.2 26th 49.4 58.9 average 84%

Daily maximum temperatures for September 2020
123456789101112131415161718192021222324252627282930
Cerberus15.922.219.115.815.519.323.420.214.819.619.813.616.216.414.721.914.219.124.422.119.318.314.414.511.713.213.113.218.618.6
Coldstream15.321.719.917.116.818.322.120.716.021.519.516.417.517.118.721.715.918.725.622.218.818.314.813.711.513.814.416.520.217.9
Essendon Airport15.020.819.716.716.418.922.519.215.021.319.815.317.717.116.922.215.620.826.021.819.418.316.414.711.414.014.014.620.719.4
Ferny Creek12.117.415.212.712.715.218.818.413.417.516.013.313.513.815.018.412.417.921.918.314.813.711.39.97.19.210.012.216.313.8
Frankston (Ballam Park)15.521.818.715.916.118.822.621.014.619.519.614.515.715.715.621.014.019.824.621.818.817.013.813.911.813.713.614.120.117.3
Laverton RAAF15.420.719.616.617.319.422.719.914.221.320.515.017.717.316.123.214.120.026.421.820.118.815.914.611.514.413.413.620.2
Melbourne (Olympic Park)15.722.019.917.316.619.222.919.915.621.419.416.017.216.615.822.815.518.726.322.019.818.915.115.011.913.413.413.621.019.4
Melbourne Airport14.819.419.016.517.218.921.718.714.820.719.814.817.316.916.921.215.020.325.221.819.018.316.114.211.513.513.814.420.219.0
Moorabbin Airport16.022.619.717.215.719.023.221.215.520.620.015.615.816.615.522.915.917.526.622.619.518.714.714.411.214.013.613.420.919.2
Scoresby Research Institute15.121.119.116.616.918.722.221.415.721.120.016.217.116.917.121.414.920.425.222.218.317.915.513.611.813.313.815.319.618.5
Viewbank15.621.819.617.016.618.522.621.115.821.220.215.717.317.118.121.716.218.925.322.018.618.416.014.412.913.914.215.120.719.6
Wallan (Kilmore Gap)10.015.114.812.914.113.916.915.511.316.015.213.214.113.015.117.212.216.520.716.813.813.812.99.38.69.610.412.515.013.8
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 2020
123456789101112131415161718192021222324252627282930
Cerberus2.06.88.79.09.72.56.816.05.75.68.012.510.89.66.04.09.69.511.015.513.712.510.37.56.86.97.83.80.29.7
Coldstream-0.35.87.42.14.92.23.115.64.61.75.212.211.75.43.32.58.45.39.615.416.210.17.96.95.92.24.60.41.39.3
Essendon Airport7.59.512.07.28.35.28.715.36.34.510.712.411.39.47.86.211.29.211.516.216.110.89.56.86.94.77.55.32.612.1
Ferny Creek2.76.49.24.86.26.49.813.16.13.59.29.88.96.65.77.58.66.312.212.912.78.36.33.83.31.43.53.03.89.0
Frankston (Ballam Park)5.48.99.78.69.95.38.115.95.75.39.912.311.110.66.36.711.210.011.516.713.912.010.38.06.76.24.35.53.810.3
Laverton RAAF6.49.711.66.76.64.09.015.64.95.111.212.211.18.35.74.810.78.810.616.414.711.09.45.66.95.07.73.41.411.5
Melbourne (Olympic Park)6.68.612.99.09.76.98.816.68.15.410.413.311.911.17.47.111.88.411.317.116.612.310.68.27.26.28.86.54.310.7
Melbourne Airport3.89.210.15.66.75.48.815.06.24.29.811.710.57.66.26.010.69.110.615.415.09.97.85.06.13.36.93.62.210.7
Moorabbin Airport8.010.110.68.69.74.511.216.85.93.19.212.811.510.45.65.111.87.710.316.914.612.111.08.17.16.77.26.12.411.5
Scoresby Research Institute3.67.711.26.96.35.610.715.84.89.812.611.47.35.25.110.75.610.416.116.512.09.97.46.13.94.52.61.511.8
Viewbank3.57.312.57.68.94.38.616.27.73.08.911.811.89.56.44.811.28.211.316.716.411.49.47.26.35.47.43.41.67.5
Wallan (Kilmore Gap)3.36.08.13.32.95.17.410.95.64.16.18.69.37.45.76.58.67.48.712.011.86.74.52.83.30.24.52.53.98.3
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 2020
123456789101112131415161718192021222324252627282930
Bonbeach (Carrum (Patterson River Countr - - - - 2.0 - 1.5 - - 25.0 - - 2.5 - 2.0 - - - 4.0 24.4 - -
Bullengarook East - - - 1.4 0.6 - - - 2.4 - - - 9.8 - - - 0.4 0.6 0.8 2.0 3.2 2.4 1.0 - 15.4 9.6 4.6 0.2 - 2.4
Burnside - - - - 1.0 - - - 1.0 - - 3.0 13.6 - - - 1.0 - - - - - 1.2 1.2 3.1 7.2 1.0 - - 1.2
Cape Schanck - - 2.4 - - - - - 3.0 - - 11.6 32.0 - - - 6.0 - - 0.8 7.2 - 7.2 2.0 4.2 20.0



Cerberus - - 2.8 1.8 1.0 0.2 - - 0.6 - 0.4 5.0 42.4 - - 0.2 3.8 0.2 - 0.4 2.4 - 2.2 1.4 4.4 10.6 7.4 - - 1.0
Cheltenham Kingston Centre - - 0.2 - - - - - 0.3 - - 0.6 11.0 - - - 2.0 - - - - - 0.8 0.4 1.6 14.0 5.0 - - 0.2
Coldstream - - - - 0.8 - - - 2.4 - - 1.0 11.8 - - - - - - 0.4 - 0.2 0.8 5.0 6.2 27.6 7.4 0.2 - 1.2
Essendon Airport - - - - 0.2 - - - 0.8 - - 0.8 12.0 - - - 0.2 - 0.2 - - - 1.6 0.2 2.8 8.0 1.6 - - 0.8
Ferny Creek 0.6 - 0.2 - 2.0 - 0.2 - 3.4 0.2 - 2.0 15.2 1.0 - - 0.8 0.2 - 0.6 - 0.4 1.2 7.6 7.0 19.2 8.4 - 0.2 3.6
Frankston (Ballam Park)
- 1.0 0.2 0.8 - -
1.2 - - 5.6 23.4 0.2 - - 3.4 0.2 - 0.6 0.2 - 1.6 1.2 3.2 19.2 8.0 - - 1.6
Kinglake West - - - 0.8 - - - - 1.8 - - 0.4 11.2 0.4 - - - - 0.8 4.4 - 1.4 3.2 7.2 6.2 27.0 7.8 - - 0.8
Kinglake West (Wallaby Creek)





-



-



0.4 3.6 12.0 6.6
0.8 30.8 9.8 12.4 0.4



Lancefield - - - 1.0 0.8 - - - 1.8 - - - 9.2 - - - - - 0.4 8.4 - - 3.2 2.8 15.4 8.0 2.4 - - 4.4
Laverton RAAF 0.2 - - 0.2 - 0.2 -
1.0 - - 3.6 15.8 0.2 - - 1.4 0.2 - - - 0.2 0.2 1.2 3.0 7.0 2.4 - - 1.6
Main Ridge - - 2.0 - - - - - - 3.2 22.0 30.0 - - - 6.0 - - - 8.2 - 2.4 - - 36.2 10.0 - - 0.4
Melbourne (Olympic Park) - - - - 0.2 0.2 - - 1.0 - - 1.6 11.8 - - - 0.8 - - - - - 0.2 1.6 3.2 9.4 3.0 - - 0.6
Melbourne Airport - - - - 0.2 - - - 0.6 - - 1.0 11.6 0.2 - - - - - - - - 0.4 1.4 3.2 8.2 0.4 - - 0.6
Melbourne Botanical Gardens - - - - 1.0 - - - - - - 4.2 13.2 - - - - 1.0 - - 0.2 - - 1.8 3.6




Moorabbin Airport 0.4 - 0.2 0.2 1.2 - - - 1.4 - - 4.0 18.0 - - - 1.8 - - 0.6 0.8 - 2.2 0.6 4.8 10.0 4.0 - - 1.2
Mount Waverley (Riversdale Golf Club) 0.4 - - - 0.8 - - - 2.0 - - 3.0 12.0 - - - 1.4 - - - 0.6 - - 2.6





Newham (Cobaw) - - - - 1.0 - - - 2.4 - - 9.8 - - - - - 0.4 11.4 - - 2.4 4.0 23.6 4.6 1.0 - - 7.4
Oakleigh (Metropolitan Golf Club) - - - - - - - - 2.2 - - 2.2 17.0 - - - 2.6 - - - - - - - 6.6 15.4



Rosebud (Country Club) - - 1.6 - 1.0 - - - - - - 33.8 - - - 6.0 - 7.8 - 1.0 - 21.0 11.4


Scoresby Research Institute 0.6 - 0.2 0.2 1.4 - - - 1.8 - 0.2 2.4 12.2 - - - 0.6 - 0.2 - - - 0.4 2.2 6.0 20.6 5.0 - - 3.0
Springvale (Sandown) - - 0.4 - 0.6 - - 1.4 - - - 3.2 16.0 - - - - - 1.2 0.2 0.4 1.2 0.4 10.2 21.0 2.0 - - 8.0
Springvale Necropolis - - - - - - - - - - - 23.0 - - - - - - - - - 1.0 - 5.8 29.0 - -
Toolangi (Mount St Leonard DPI) - - - - - - - 4.0 - - - 13.4 - - - - - - - - - - 26.8 49.6

Toorourrong Reservoir (Toorourrong)





-



-



- 0.6 6.8 4.4
0.2 23.4 5.2 8.6 -



Upper Plenty - - - 1.6 - - - - 1.4 - - - 10.8 - - - 0.2 - - 5.4 - 0.4 0.2 3.4 13.2 13.8 3.0 0.2
1.8
Viewbank - - - 0.2 0.4 - - - 1.6 - - 1.8 9.8 - - - 0.8 - - - - 0.2 0.4 0.8 5.4 17.6 3.0 - - 0.6
Wallan - - - - - - - - - - - - - 8.9 - - 0.8 - 2.0 3.0 - - 1.2 1.4 13.2 15.2 1.2 - - 0.4
Wallan (Kilmore Gap) - - - - 0.2 - - - 1.2 - - - 10.8 - - 0.4 0.2 0.2 2.2 8.0 - 0.4 1.0 1.4 12.0 9.0 1.2 0.2 - 1.0
Warburton (O'Shannassy Reservoir (Quarte





-



-



11.4 4.4 17.8 18.8

35.4 - 12.0 0.2



Willowmavin (Avalon Station) - - 0.2 0.2 1.4 0.2 - - 1.4 - 0.2 - 8.6 0.2 - - - - - 10.8 0.2 - 1.8 3.8 18.8 10.2 2.0 - - 3.4
Woodend - 0.2 0.2 0.2 1.4 - - - 3.0 - - 0.4 11.8 - - - 0.6 0.2 0.4










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 10 am on Thursday 1 October 2020. 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

Climate