Victoria in September 2021: warm days, above average rainfall in the east

September rainfall was above average for the state as a whole. Daytime temperatures were warmer than average across much of Victoria, while night-time temperatures were warmer than average in most of Victoria's east and south.

Above average rainfall

  • Averaged across the state, rainfall was 11% above the long-term (1961-1990) mean.
  • September was wetter than average in most of eastern Victoria, with some parts very much wetter than average.
  • It was drier than average in the state's south-west.
  • A strong cold front crossed Victoria on the 3rd and 4th, bringing widespread moderate rainfall; many sites recorded daily totals above 30 mm, with locally much higher totals up to 80 mm in Gippsland.
  • A series of cold fronts and low pressure troughs crossed the state between the 17th and 20th and brought showers, thunderstorms, strong winds, hail and low-level snow.
  • Towards the end of month, a complex low pressure system and an associated low pressure trough that extended well into the tropics resulted in widespread rainfall across Victoria.
  • The highest daily rainfall in Victoria this September was 123.2 mm, recorded at Lorne (Mount Cowley) on the 30th.
  • Many sites had their highest September daily rainfall on record between the 4th and 6th and on the 30th.
  • Some sites had their highest total September rainfall on record, or their highest total September rainfall for at least 20 years
  • Victoria's January to September rainfall totals were around 3% above the long-term average.

Warm days

  • Daytime temperatures were warmer than average across much of Victoria.
  • Night-time temperatures were warmer than average in most of the state's east and south, with parts of Gippsland experiencing much warmer than average nights.
  • Averaged across the state, mean maximum and minimum temperatures were 1.30 °C and 0.60 °C above average respectively.
  • On the 2nd, daytime temperatures were up to 10 degrees above average across Victoria, with many sites recording their early season maximum temperature records.
  • The highest daily maximum temperature in the state this September was 33.0 °C, recorded at Mildura Airport on the 2nd.
  • Victoria's highest daily minimum temperature this month, 21.7 °C, was recorded at Moorabbin Airport on the 3rd; this was the equal fifth highest daily minimum temperature on record for Victoria, and the highest this early in September.
  • Some sites had their warmest September night (highest daily minimum temperature) on record on the 3rd.
  • Despite generally mild night-time temperatures, there were some cold nights, notably between the 13th and 15th, on the 21st and the 26th.
  • The lowest daily minimum temperature this September was −7.7 °C, recorded at Mount Hotham on the 26th.
  • For the year-to-date, Victoria's mean temperature was 0.37 °C above average.

Strong winds and snow

  • Rised dust was observed in the north-west of the state on the 2nd, associated with the passage of a cold front.
  • Minor to moderate flood warnings were issued for a number of rivers in eastern Victoria after heavy rainfall between the 4t and 6th.
  • Cold fronts that crossed Victoria between the 17th and 20th generated strong and gusty winds and were followed by polar air in their wake; snow fell to low levels with reports of snow in the Macedon and Yarra Ranges and at Mount Baw Baw, and snow flurries were reported around Ballarat and in the Dandenong Ranges.
  • This month the strongest wind gust of 141 km/h was recorded at Wilsons Promontory Lighthouse on the 18th.

Further information

Media
(03) 9669 4057

Extremes in September 2021
Hottest day 33.0 °C at Mildura Airport on the 2nd
Warmest days on average 22.5 °C at Mildura Airport
Coolest days on average 3.8 °C at Mount Hotham
Coldest day -2.4 °C at Mount Hotham on the 13th
Coldest night -7.7 °C at Mount Hotham on the 26th
Coolest nights on average -1.4 °C at Mount Hotham
Warmest nights on average 10.4 °C at Gabo Island Lighthouse
Warmest night 21.7 °C at Moorabbin Airport on the 3rd
Warmest on average overall 15.0 °C at Mildura Airport
Coolest on average overall 1.2 °C at Mount Hotham
Wettest overall 268.6 mm at Mount Baw Baw
Wettest day 123.2 mm at Lorne (Mount Cowley) on the 30th
Strongest wind gust 141 km/h at Wilsons Promontory Lighthouse on the 18th

Maps
ObservedAnomalyDecile rank
Total
rainfall
Map of Rainfall totals Map of Percentage of normal rainfall Map of Rainfall deciles
Mean
daily
maximum
temperatures
Map of Mean maximum temperature Map of Anomaly in mean maximum temperature Map of Decile rank of mean maximum temperature
Mean
daily
minimum
temperatures
Map of Mean minimum temperature Map of Anomaly in mean minimum temperature Map of Decile rank of mean minimum temperature

Click on a map to show it full size in a pop-up window


Record highest September daily rainfall
New record
(mm)
Old
record
Years of
record
Cobram (Goulburn Murray) 40.0 on the 4th 38.4 on the 15th in 1993 63
Erica (Parkers Corner) 77.4 on the 6th 69.2 on the 15th in 1993 60
Beulah West 36.6 on the 30th 34.0 on the 4th in 2010 53
Morwell (Latrobe Valley Airport) 35.0 on the 4th 33.4 on the 15th in 1993 38
Wangaratta Aero 43.2 on the 4th 43.0 on the 25th in 1992 35
Combienbar AWS 42.8 on the 30th 41.0 on the 1st in 1996 28
Mount Moornapa 66.0 on the 5th 57.2 on the 3rd in 2016 28
Yarrawonga 42.0 on the 4th 35.2 on the 20th in 1997 28
Coldstream 32.6 on the 4th 31.4 on the 29th in 2011 27
Mount Tamboritha 41.0 on the 4th 37.2 on the 29th in 2011 27
Maffra 63.2 on the 6th 34.0 on the 29th in 2011 26
Mount Nowa Nowa 72.8 on the 5th 54.2 on the 3rd in 2016 26
Balook 56.6 on the 30th 42.4 on the 27th in 2009 22
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
Avon River @ The Channel 59.0 on the 5th 51.0 on the 3rd in 2016 21
Benwerrin 103.8 on the 30th 53.4 on the 14th in 2016 21
Haines Junction (Mount Sabine) 96.0 on the 30th 54.0 on the 7th in 2015 21
Hurdle Ck at Bobinawarrah 42.6 on the 4th 40.0 on the 17th in 2013 21
Lorne (Mount Cowley) 123.2 on the 30th 65.4 on the 14th in 2016 21
Merton (Enderlee) 54.2 on the 4th 43.6 on the 5th in 2010 21
Orbost 63.0 on the 5th 59.6 on the 3rd in 2016 21
Traralgon EPA 31.2 on the 4th 25.8 on the 29th in 2011 21
Wonnangatta River @ Waterford 58.6 on the 4th 32.4 on the 26th in 2009 21



Record highest September total rainfall
New record
(mm)
Old
record
Years of
record
Average for
September
Mount Moornapa 152.8 133.4 in 2016 28 55.1
Maffra 95.8 89.2 in 2000 24 41.2
Haines Junction (Mount Sabine) 223.8 182.0 in 2002 21 115.5
Lorne (Mount Cowley) 236.6 207.2 in 2016 21 124.6
Traralgon EPA 104.4 90.4 in 2019 21 55.6
Wonnangatta River @ Waterford 121.0 78.2 in 2016 21 48.6
Mitchell River @ Glenaladale 104.0 91.0 in 2019 20 47.7
Myrrhee (Boggy Ck at Angleside) 125.4 107.8 in 2016 20 56.6

Highest September total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
September
Marlo 136.2 145.7 in 1916* 65.2
Briagolong 108.0 183.4 in 1993 50.7
East Sale 75.6 204.6 in 1993 50.0
Ensay 109.4 113.0 in 1993 56.9
Dargo 94.8 97.0 in 1995 61.5
Murderers Hill 150.6 283.6 in 1993* 81.6
Falls Creek 215.6 363.8 in 1998* 120.5
Mount Tamboritha 142.4 =142.4 in 1996* 80.0
Glenmaggie Weir 90.2 101.0 in 2000 49.9
Morwell (Latrobe Valley Airport) 122.0 143.8 in 2000 74.9

* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported




Record highest September daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Ouyen (Post Office) 21.4 on the 3rd 20.2 on the 24th in 2001 65 6.7
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
North Mallee (district 76)
Mildura Airport 22.5 +1.9 33.0 2nd 7.6 +0.2 2.1 15th 14.8 26.4 average 56%
Ouyen (Post Office) 21.9 +1.6 32.8 2nd 7.1 +0.4 1.0 22nd 34.5 32.6 average 106%
Walpeup Research 21.4 +1.7 32.2 2nd 6.4 -0.5 0.3 21st 28.8 31.1 average 93%
South Mallee (district 77)
Hopetoun Airport 20.7 +0.4 32.5 2nd 5.8 +1.0 -0.3 15th 33.4 26.9 high 124%
Swan Hill Aerodrome 21.1 +0.7 31.5 2nd 6.0 +0.2 0.0 26th 37.6 26.2 high 144%
North Wimmera (district 78)
Kellalac (Warracknabeal Airport) 18.9   30.2 2nd 5.0   0.1 14th 43.6
Nhill Aerodrome 18.3 -0.1 30.9 2nd 5.9 +0.1 0.2 14th 36.8 31.2 average 118%
South Wimmera (district 79)
Edenhope Airport 16.7 -0.3 29.4 2nd 6.8 +0.3 1.9 26th 35.0 49.4 average 71%
Grampians (Mount William) 9.2 +0.3 19.1 2nd 2.4 +0.2 -2.4 21st 120.0 117.3 average 102%
Horsham Aerodrome 17.9 -0.1 29.6 2nd 4.4 0.0 -1.2 26th 42.0 37.4 average 112%
Kanagulk 16.7 +0.1 28.6 2nd 5.7 +0.2 0.1 26th 38.8 43.9 average 88%
Longerenong 17.7 +0.3 26.1 9th 4.5 -0.5 -1.4 26th 44.8 40.4 average 111%
Pyrenees (Ben Nevis) 12.2 +0.3 20.4 2nd 4.2 +0.1 -1.2 21st 62.0 68.6 average 90%
Stawell Aerodrome 16.7 +0.1 27.1 2nd 6.3 +0.3 0.9 26th 35.8 49.3 average 73%
Lower North (district 80)
Charlton 19.0 0.0 29.0 2nd 5.9 +0.7 0.0 26th 52.4 35.4 high 148%
Echuca Aerodrome 19.6 +1.2 28.2 11th 6.0 -0.3 1.0 15th 24.7 38.5 average 64%
Kerang 20.9 +1.7 30.5 2nd 7.0 +0.4 2.3 26th 50.4 35.4 high 142%
Kyabram 18.6 +0.9 27.3 11th 5.9 +0.6 0.6 14th 29.8 41.1 average 73%
Upper North (district 81)
Bendigo Airport 17.7 +0.7 24.2 2nd 5.4 +0.9 -0.2 26th 71.6 50.9 high 141%
Shepparton Airport 18.3 +0.1 26.7 11th 5.4 0.0 0.9 15th 52.8 36.4 high 145%
Tatura Inst Sustainable Ag 18.0 +0.5 26.1 11th 5.7 +0.3 1.3 27th 63.2 42.5 high 149%
Yarrawonga 18.5 -0.1 26.5 11th 5.2 +0.1 -0.4 26th 61.4 42.6 high 144%
Lower Northeast (district 82)
Benalla Airport 17.5 -0.3 24.8 11th 5.7 +1.3 1.1 19th 82.0 43.0 high 191%
Corryong Airport 18.1 +0.2 24.0 2nd 4.4 +1.3 -1.5 14th 157.9 70.7 high 223%
Dartmouth Reservoir 16.9 +0.3 23.4 2nd 4.6 +0.1 1.0 21st 87.0 101.5 average 86%
Hunters Hill 12.2 -0.1 18.8 2nd 4.7 +0.2 -1.2 21st 213.0 117.4 high 181%
Rutherglen Research 17.9 +0.7 25.3 11th 3.9 -0.2 -2.0 14th 61.2 53.6 average 114%
Strathbogie 14.7 +0.4 22.0 11th 3.6 -0.1 -1.5 27th 88.0 93.7 average 94%
Wangaratta Aero 17.8 +0.2 25.1 11th 5.0 +0.5 -0.1 26th 92.8 53.6 high 173%
Upper Northeast (district 83)
Falls Creek 4.8 -0.1 9.2 2nd -0.7 +0.1 -6.6 21st 215.6 120.5 v high 179%
Mount Buller 5.8 +0.8 11.1 11th -0.4 +0.3 -5.9 26th 0 141.8 lowest 0%
Mount Hotham 3.8 +0.2 8.4 28th -1.4 +0.2 -7.7 26th 198.2 129.7 high 153%
Omeo 15.1 -0.3 21.4 2nd 3.7 +0.6 -2.4 27th 134.6 54.0 v high 249%
East Gippsland (district 84)
Combienbar AWS 15.9 +0.1 24.2 3rd 7.1 +0.6 1.8 26th 136.6 71.1 v high 192%
Gabo Island Lighthouse 17.0 +1.0 28.5 11th 10.4 +0.7 6.7 26th 77.8 71.4 average 109%
Gelantipy 14.0 +0.1 21.1 2nd 5.0 +0.6 -0.4 15th 101.6 58.3 high 174%
Lakes Entrance (Eastern Beach Road) 17.8 -0.3 28.2 11th 7.7 0.0 2.2 27th 102.3 51.1 high 200%
Mallacoota 17.7 +0.2 28.8 11th 9.0 +0.7 3.8 27th 88.8 77.6 average 114%
Mount Nowa Nowa 16.5 -0.5 25.3 11th 7.8 0.0 3.6 26th 142.0 63.2 v high 225%
Orbost 18.3 +0.1 27.6 2nd 8.0 +0.4 2.6 16th 131.0 59.8 v high 219%
West Gippsland (district 85)
Bairnsdale Airport 17.9 +0.1 27.5 2nd 6.6 +0.8 1.4 27th 89.2 51.1 high 175%
Corner Inlet (Yanakie) 16.4   25.7 2nd 8.0   2.1 26th 112.8
East Sale 17.7 +0.6 27.1 2nd 6.7 +1.1 1.6 27th 75.6 50.0 v high 151%
East Sale Airport 17.9   27.3 2nd 6.7   2.4 27th 73.4
Morwell (Latrobe Valley Airport) 17.6 +0.6 27.0 2nd 6.2 +0.3 -0.3 15th 122.0 74.9 v high 163%
Mount Baw Baw 6.1 +0.4 12.8 2nd -0.1 +0.1 -5.1 26th 268.6 160.8 v high 167%
Mount Moornapa 16.4 0.0 26.4 11th 7.2 +0.3 2.3 26th 152.8 55.1 highest 277%
Nilma North (Warragul) 16.9   25.0 2nd 6.8   0.8 14th 122.4
Pound Creek 16.9 +0.2 25.8 2nd 7.5 0.0 0.4 16th 113.4 82.0 high 138%
Wilsons Promontory Lighthouse 15.4 +1.1 25.1 2nd 10.0 +1.0 6.1 25th 134.4 98.6 high 136%
Yarram Airport 17.3 0.0 27.0 2nd 7.0 +1.0 0.1 27th 68.0 50.3 high 135%
East Central (district 86)
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
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%
Rhyll 16.9 +0.8 23.8 2nd 9.7 +0.2 5.7 21st 78.4 68.8 average 114%
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%
West Central (district 87)
Avalon Airport 18.3 +0.5 27.4 2nd 6.6 -0.1 0.1 27th 44.2 44.8 average 99%
Breakwater (Geelong Racecourse) 17.8 +0.1 26.7 2nd 7.5 -0.3 1.8 27th 52.8 52.2 average 101%
Laverton RAAF 18.1 +1.0 25.4 2nd 7.6 +0.9 1.9 27th 60.8 48.3 high 126%
Sheoaks 16.0 +0.5 24.8 2nd 6.0 -0.2 -0.3 26th 39.8 47.9 average 83%
North Central (district 88)
Castlemaine Prison 17.1 +1.4 23.0 9th 6.4 +1.3 -0.1 25th 52.9 59.8 average 88%
Eildon Fire Tower 13.9 +0.3 20.6 11th 6.1 +0.4 0.0 21st 87.0 64.2 high 136%
Lake Eildon 17.5 +0.9 24.2 11th 6.3 +0.7 0.9 26th 98.8 81.7 high 121%
Mangalore Airport 17.7 +0.8 24.8 11th 5.5 +0.2 -0.9 26th 76.8 54.3 high 141%
Maryborough 17.4 +0.6 24.4 2nd 5.6 +0.2 1.6 26th 58.2 51.6 average 113%
Puckapunyal Lyon Hill (Defence) 17.4   24.2 11th 7.1   1.8 21st 61.2
Puckapunyal West (Defence) 16.6   22.9 11th 6.4   2.1 19th 72.0
Redesdale 17.6 +1.2 23.3 11th 4.6 +0.4 -1.2 26th 59.8 52.9 average 113%
Wallan (Kilmore Gap) 13.9 +0.7 20.3 11th 5.7 0.0 1.7 21st 95.0 60.2 high 158%
Western Plains (district 89)
Ballarat Aerodrome 14.6 +0.7 21.7 2nd 4.9 +0.1 -0.7 26th 67.6 71.0 average 95%
Westmere 15.4 -0.3 23.2 2nd 5.0 +0.2 -0.6 26th 56.6 50.1 average 113%
West Coast (district 90)
Aireys Inlet 16.4 +0.2 26.6 2nd 8.6 +0.4 4.4 25th 57.4 58.3 average 98%
Cape Nelson Lighthouse 15.7 -0.3 27.4 2nd 9.7 +0.3 5.5 21st 59.0 72.9 low 81%
Cape Otway Lighthouse 15.5 +0.3 25.6 2nd 9.3 +0.8 6.0 21st 110.6 90.2 high 123%
Casterton 16.5 +0.3 28.2 2nd 6.4 +0.3 0.5 26th 45.0 66.4 low 68%
Colac (Mount Gellibrand) 15.1 +0.5 23.6 2nd 6.8 +0.3 3.3 21st 31.8 53.5 low 59%
Dartmoor 16.6 +0.2 29.3 2nd 7.1 +0.4 2.4 27th 46.4 69.1 low 67%
Hamilton Airport 15.7 +0.4 25.4 2nd 5.9 +0.1 1.3 26th 49.2 67.3 low 73%
Mortlake Racecourse 16.6 +0.8 25.2 2nd 6.1 +0.5 0.7 16th 69.0 58.5 high 118%
Port Fairy AWS 16.9 +0.3 27.7 2nd 9.1 +0.8 5.2 27th 54.0 68.6 low 79%
Portland (Cashmore Airport) 15.9 +0.6 27.1 2nd 8.0 +0.5 4.1 27th 61.8 87.4 low 71%
Warrnambool Airport NDB 16.2 +0.2 24.3 2nd 7.4 +0.7 2.5 15th 64.0 74.5 average 86%

Notes

The Monthly climate summary, generally published on the first working day of each month, lists the main features of the weather in Victoria 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 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

Climate