Victoria in September 2017: Dry in the north, wet in the south; mild temperatures

September rainfall in Victoria was below average across most of the State, particularly across the northern districts. Coastal areas saw average to above average rainfall. Mean maximum and mean minimum temperatures were near average across the State as a whole, though clear skies saw cooler than average nights across northern parts. A warm spell in the third week saw several locations report their warmest September day on record.

Below average rainfall in the north and above average in some southern coastal regions

  • The succession of cold fronts that passed through Victoria in the first two weeks of September brought some good rainfalls to coastal regions that saw several locations report their wettest September for at least 20 years
  • The rainfall associated with the fronts didn't extend to the interior of the state, resulting in several stations recording their driest September for at least 20 years

Warmer days in the northwest cooler nights in across the north

  • Average maximum temperatures were recorded through most of the central regions of Victoria, below average temperatures in the Western Plains and West Coast, while the Mallee and North Wimmera recorded above average September maximum temperatures
  • A warm spell in the third week of the month saw several locations report their highest September temperature on record. In particular, Mildura set a new State record for Victoria on the 23rd with 37.7 °C; the previous record was 37.4 °C also at Mildura on 22 September 2003. The warm temperatures were the result of a high pressure cell located in the Tasman that brought warm air from the interior of the continent
  • The warm spell saw Combienbar and Mount Baw Baw, both Alpine sites, recorded their warmest September night (highest daily minimum temperature) on record
  • The cold fronts at the beginning of the month resulted in several stations (Dartmouth Reservoir, Port Fairy and Cape Nelson Lighthouse) recording their coldest September day (lowest maximum temperature) on record
  • Cold nights during the month saw Avalon Airport and Swan Hill aerodrome report their coldest September temperature on record

Wind and Snow

  • During the first week of September, a strong cold front crossing south of Australia extended a pool of cold air over Victoria bringing showers, thunder and small hail. Strong winds during 3rd to 9am on 4th included 115 km/h at Mt Buller and 107 km/h at Mt Hotham 103 km/hr at Port Fairy
  • Snow was reported down to low levels with reports of snow settling at Lorne, Beech Forest and other towns in the Otways
  • The passage of a fast moving cold front on the morning of the 30th, across southern Victoria, produced a wind gust of 141 km/h at Wilsons Promontory Lighthouse
  • A cold front on the 18 September resulted in strong winds. Mt William recorded 117 km/h, Wilson Promontory and Melbourne airport 94 km/h, Cape Otway 87 km/h and Mt Hotham 85 km/h

Further information

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Extremes in September 2017
Hottest day 37.7 °C at Mildura Airport on the 23rd
Warmest days on average 22.8 °C at Mildura Airport
Coolest days on average 2.7 °C at Mount Hotham
Coldest day -3.9 °C at Mount Hotham on the 4th
Coldest night -7.5 °C at Mount Hotham on the 5th
Coolest nights on average -2.8 °C at Mount Hotham
Warmest nights on average 9.7 °C at Gabo Island Lighthouse
Warmest night 17.9 °C at Combienbar AWS on the 23rd
Warmest on average overall 15.2 °C at Mildura Airport
Coolest on average overall 0.0 °C at Mount Hotham
Wettest overall 234.6 mm at Balook
Driest overall 0 mm at Lima South (Lake Nillahcootie)
Wettest day 41.4 mm at Ferny Creek on the 16th
Strongest wind gust 141 km/h at Wilsons Promontory Lighthouse on the 30th

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 total rainfall
New record
(mm)
Old
record
Years of
record
Average for
September
Apollo Bay 223.0 199.6 in 1952 117 110.1
Simpson South 200.6 179.2 in 1974 50 102.2
Port Fairy AWS 96.2 94.0 in 2016 24 70.1

Highest September total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
September
Terang 139.4 157.4 in 1983* 80.8
Hawkesdale (Post Office) 114.2 116.8 in 1992* 73.0
Mount Best (Upper Toora) 172.4 299.4 in 1993* 112.2
Cobden (Post Office) 158.0 159.4 in 1996 87.8
Rhyll 112.0 129.0 in 1996 68.9
Ventnor (Oaklands) 117.2 146.8 in 1996 71.2
Durdidwarrah 103.6 105.0 in 1996* 68.0

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




Record lowest September total rainfall
New record
(mm)
Old
record
Years of
record
Average for
September
Kyabram 6.2 8.8 in 2007 54 42.2
Swan Hill Aerodrome 6.8 7.8 in 2008 21 28.1

Lowest September total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
September
Birchip (Woodlands) 5.2 4.8 in 1951 35.6
Rutherglen Research 9.0 =9.0 in 1972 54.3
Ouyen (Post Office) 7.0 4.6 in 1980 33.1
Ultima (Post Office) 11.0 7.2 in 1982* 34.5

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




Record highest September temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Gabo Island Lighthouse 31.2 on the 23rd 31.0 on the 30th in 1973 107 15.9
Kerang 36.6 on the 23rd 34.9 on the 28th in 1928 104 19.1
Laverton RAAF 31.3 on the 23rd 31.2 on the 12th in 2009 74 17.0
East Sale 33.9 on the 23rd 33.0 on the 30th in 1980 73 17.1
Mildura Airport 37.7 on the 23rd 37.4 on the 22nd in 2003 72 20.5
Echuca Aerodrome 36.0 on the 23rd 34.0 on the 30th in 2001 61 18.3
Ouyen (Post Office) 36.6 on the 23rd 35.6 on the 22nd in 2003 61 20.3
Mangalore Airport 31.8 on the 23rd 29.7 on the 27th in 2008 59 16.8
Tatura Inst Sustainable Ag 33.7 on the 23rd 31.7 on the 27th in 2008 53 17.5
Scoresby Research Institute 30.8 on the 23rd 30.0 on the 26th in 1987 52 16.5
Kyabram 33.9 on the 23rd 32.2 on the 12th in 2009 51 17.6
Point Hicks (Lighthouse) 36.4 on the 23rd 31.1 on the 18th in 1981 49 16.6
Lake Eildon 28.5 on the 23rd 28.2 on the 26th in 1987 48 16.6
Melbourne Airport 30.2 on the 23rd = 30.2 on the 12th in 2009 48 16.7
Bairnsdale Airport 35.4 on the 23rd 32.6 on the 26th in 1987 37 17.7
Bundoora (Latrobe University) 30.5 on the 23rd 29.2 on the 12th in 2009 35 17.0
Morwell (Latrobe Valley Airport) 31.4 on the 23rd 31.0 on the 27th in 1987 34 17.0
Edi Upper 27.0 on the 23rd 26.5 on the 27th in 2008 30 16.3
Cranbourne Botanic Gardens 30.0 on the 23rd 28.4 on the 19th in 2006 27 16.6
Bendigo Airport 32.8 on the 23rd 30.4 on the 12th in 2009 26 17.0
Gelantipy 27.4 on the 23rd 23.8 on the 22nd in 2003 25 13.8
Hunters Hill 24.5 on the 23rd 21.5 on the 19th in 2006 25 12.3
Mallacoota 35.2 on the 23rd 31.1 on the 16th in 1996 25 17.5
Redesdale 29.1 on the 23rd 28.5 on the 12th in 2009 25 16.3
Combienbar AWS 31.8 on the 23rd 30.2 on the 18th in 1995 24 15.7
Mount Moornapa 33.0 on the 23rd 29.1 on the 30th in 2013 24 16.2
Yarrawonga 34.0 on the 23rd 31.4 on the 27th in 2008 24 18.5
Coldstream 29.7 on the 23rd 28.3 on the 19th in 2006 23 17.2
Mount Nowa Nowa 32.7 on the 23rd 28.2 on the 19th in 2011 22 16.9
Shepparton Airport 34.1 on the 23rd 31.8 on the 27th in 2008 22 18.2
Swan Hill Aerodrome 36.3 on the 23rd 34.1 on the 27th in 2008 21 20.3
Mount Baw Baw 16.6 on the 23rd 15.7 on the 27th in 2008 20 5.7



Record lowest September daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Dartmouth Reservoir 7.6 on the 5th 8.0 on the 14th in 2003 39 16.6
Port Fairy AWS 9.7 on the 4th 10.2 on the 11th in 2004 26 16.6
Cape Nelson Lighthouse 10.1 on the 4th 10.2 on the 11th in 2004 22 15.9



Record highest September daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Combienbar AWS 17.9 on the 23rd 17.7 on the 28th in 2012 24 6.5
Mount Baw Baw 8.8 on the 23rd 8.7 on the 4th in 2013 20 -0.1



Record lowest September temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Avalon Airport -1.7 on the 1st -1.0 on the 23rd in 2007 23 6.8
Swan Hill Aerodrome -1.7 on the 17th -1.6 on the 12th in 2011 21 5.9



Record lowest September mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
September
Cape Nelson Lighthouse 8.7 = 8.7 in 2012 21 9.5

Lowest September mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
September
Rhyll 8.5 8.3 in 1995 9.5



Lowest September mean temperature for at least 20 years
Observed
(°C)
Most recent
lower
Average for
September
Dartmouth Reservoir 9.8 8.5 in 1994 10.6
Edi Upper 9.3 8.9 in 1994 10.8



Summary statistics for September 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
September
2017
Diff
from
average
Highest for
September
2017
Mean for
September
2017
Diff
from
average
Lowest for
September
2017
Total for
September
2017
Average
for
September
Rank of
September
2017
Fraction of
September
average
North Mallee (district 76)
Mildura Airport 22.8 +2.3 37.7 23rd 7.5 +0.1 1.1 9th 4.0 27.1 v low 15%
Ouyen (Post Office) 22.4 +2.1 36.6 23rd 7.0 +0.3 0.9 10th 7.0 33.1 v low 21%
Walpeup Research 21.5 +1.8 35.3 23rd 6.8 -0.1 1.6 9th 9.6 31.8 low 30%
South Mallee (district 77)
Hopetoun Airport 20.7 +0.5 34.6 23rd 4.6 -0.4 -1.0 10th 17.0 28.9 low 59%
Swan Hill Aerodrome 20.6 +0.3 36.3 23rd 5.0 -0.9 -1.7 17th 6.8 28.1 lowest 24%
North Wimmera (district 78)
Kellalac (Warracknabeal Airport) 19.1   30.6 23rd 4.9   -1.1 17th 19.4
Nhill Aerodrome 18.0 -0.5 28.3 23rd 6.3 +0.4 -0.2 26th 29.0 31.8 average 91%
Warracknabeal Museum 19.1 +0.9 31.5 23rd 6.0 +0.1 -1.0 26th 21.6 42.0 low 51%
South Wimmera (district 79)
Edenhope Airport 16.8 -0.4 25.5 22nd 7.0 +0.3 1.3 26th 63.8 52.1 high 122%
Grampians (Mount William) 8.1 -0.8 19.0 23rd 1.5 -0.8 -2.4 5th 111.4 122.2 average 91%
Horsham Aerodrome 17.5 -0.6 28.0 23rd 4.5 0.0 -2.7 26th 27.8 39.2 average 71%
Kanagulk 16.3 -0.3 24.6 22nd 6.2 +0.5 0.5 26th 59.6 43.4 high 137%
Longerenong 17.5 +0.2 27.8 23rd 4.9 -0.2 -1.9 26th 29.2 40.8 average 72%
Pyrenees (Ben Nevis) 11.7   22.6 23rd 3.6   -0.7 5th 62.8 74.8 average 84%
Stawell Aerodrome 16.2 -0.5 27.3 23rd 6.2 +0.1 -0.6 17th 31.8 52.8 low 60%
Lower North (district 80)
Charlton 19.2 +0.3 33.9 23rd 4.9 -0.5 -1.8 17th 16.0 38.5 low 42%
Echuca Aerodrome 19.1 +0.8 36.0 23rd 5.1 -1.2 -1.4 1st 7.3 39.1 v low 19%
Kerang 20.3 +1.2 36.6 23rd 6.2 -0.4 0.2 17th 9.2 35.7 v low 26%
Kyabram 18.4 +0.8 33.9 23rd 4.7 -0.6 -1.8 1st 6.2 42.2 lowest 15%
Upper North (district 81)
Bendigo Airport 17.7 +0.7 32.8 23rd 4.6 +0.1 -1.6 17th 13.6 52.5 v low 26%
Shepparton Airport 18.0 -0.2 34.1 23rd 5.0 -0.5 -1.7 1st 6.6 38.2 v low 17%
Tatura Inst Sustainable Ag 17.8 +0.3 33.7 23rd 4.7 -0.7 -2.2 1st 10.4 43.1 v low 24%
Yarrawonga 18.4 -0.1 34.0 23rd 4.7 -0.5 -1.3 17th 6.4 44.5 v low 14%
Lower Northeast (district 82)
Benalla Airport 17.1 -0.7 28.3 23rd 3.8 -0.9 -2.2 17th 23.5 45.1 average 52%
Corryong Airport 16.3 -1.7 27.0 23rd 3.1 0.0 -3.0 17th 33.6 67.4 low 50%
Dartmouth Reservoir 15.9 -0.7 27.0 23rd 3.7 -0.9 -1.5 18th 70.8 103.8 low 68%
Hunters Hill 11.5 -0.8 24.5 23rd 3.6 -1.0 -1.2 5th 79.8 119.9 average 67%
Rutherglen Research 17.3 +0.1 28.6 23rd 2.9 -1.3 -4.0 17th 9.0 54.3 v low 17%
Strathbogie 13.8 -0.5 25.5 23rd 3.2 -0.6 -3.5 1st 40.6 94.8 low 43%
Wangaratta Aero 17.1 -0.5 28.3 23rd 4.1 -0.5 -1.9 1st 17.6 55.4 low 32%
Upper Northeast (district 83)
Edi Upper 15.1 -1.2 27.0 23rd 4.2 -1.1 -1.0 17th 39.9 100.2 low 40%
Falls Creek 3.6 -1.3 13.9 23rd -1.8 -1.0 -6.8 5th 129.8 119.7 average 108%
Mount Buller 3.7 -1.3 15.0 23rd -1.9 -1.2 -6.4 5th 212.6 148.8 high 143%
Mount Hotham 2.7 -0.8 12.6 23rd -2.8 -1.2 -7.5 5th
Omeo 15.7 +0.4 27.0 23rd 2.4 -0.9 -5.0 1st 27.8 53.8 v low 52%
East Gippsland (district 84)
Combienbar AWS 16.9 +1.2 31.8 23rd 6.2 -0.3 1.2 6th 1.2 72.7 lowest 2%
Gabo Island Lighthouse 17.5 +1.6 31.2 23rd 9.7 0.0 6.7 6th 26.6 72.2 low 37%
Gelantipy 14.5 +0.7 27.4 23rd 4.0 -0.5 -2.1 1st 43.2 59.7 average 72%
Lakes Entrance (Eastern Beach Road) 19.1 +1.0 35.7 23rd 7.3 -0.6 1.9 2nd 37.2 52.9 low 70%
Mallacoota 18.4 +0.9 35.2 23rd 7.7 -0.6 3.0 11th 41.0 80.4 low 51%
Mount Nowa Nowa 17.7 +0.8 32.7 23rd 7.1 -0.8 2.6 6th 42.8 64.2 average 67%
Orbost 18.9 +0.7 34.6 23rd 6.8 -0.9 1.9 1st 33.2 59.0 low 56%
Point Hicks (Lighthouse) 17.5 +0.9 36.4 23rd 8.6 -1.0 4.8 6th 63.5 76.6 average 83%
West Gippsland (district 85)
Bairnsdale Airport 19.4 +1.7 35.4 23rd 5.3 -0.6 -1.7 1st 30.6 52.4 low 58%
Corner Inlet (Yanakie) 15.5   22.2 23rd 7.2   2.4 5th 155.6
East Sale 18.0 +0.9 33.9 23rd 5.5 -0.1 -2.2 1st 31.2 50.7 low 62%
Morwell (Latrobe Valley Airport) 17.1 +0.1 31.4 23rd 5.8 -0.1 -0.7 1st 100.4 74.5 high 135%
Mount Baw Baw 4.6 -1.1 16.6 23rd -1.2 -1.1 -5.7 5th 234.2 154.5 high 152%
Mount Moornapa 18.1 +1.9 33.0 23rd 6.3 -0.6 1.8 1st 31.4 54.3 low 58%
Nilma North (Warragul) 16.2   29.8 23rd 6.3   1.6 1st 140.2
Pound Creek 16.2 -0.5 23.4 23rd 7.5 -0.1 3.3 1st 131.4 80.5 v high 163%
Wilsons Promontory Lighthouse 15.0 +0.8 25.9 22nd 8.6 -0.4 4.0 5th 186.2 99.0 v high 188%
Yarram Airport 16.7   26.7 23rd 6.2   1.7 1st 82.4 49.4 v high 167%
East Central (district 86)
Bundoora (Latrobe University) 17.6 +0.6 30.5 23rd 7.2 -0.1 0.0 1st 43.8 59.4 low 74%
Cerberus 16.5 0.0 24.7 23rd 7.5 -0.1 3.4 20th 92.2 67.5 high 137%
Coldstream 17.0 -0.2 29.7 23rd 5.1 -0.5 -2.6 1st 65.8 70.2 average 94%
Cranbourne Botanic Gardens 17.0 +0.4 30.0 23rd 7.2 -0.6 1.3 1st 110.3 85.8 high 129%
Essendon Airport 17.8 +1.0 29.3 23rd 7.7 +0.9 1.2 1st 33.6 51.4 low 65%
Ferny Creek 13.3   26.8 23rd 5.8   1.5 14th 109.0
Frankston AWS 15.0 -0.6 25.6 23rd 8.9 -0.6 4.8 1st
Melbourne (Olympic Park) 17.8   30.6 23rd 9.0   3.7 1st 39.6
Melbourne Airport 17.7 +1.0 30.2 23rd 7.0 -0.1 1.1 1st 26.0 47.2 low 55%
Moorabbin Airport 17.0 +0.1 29.9 23rd 8.3 +0.2 0.8 1st 38.6 64.6 low 60%
Rhyll 15.6 -0.5 23.7 23rd 8.5 -1.0 4.3 5th 112.0 68.9 v high 163%
Scoresby Research Institute 17.0 +0.5 30.8 23rd 7.5 -0.1 0.0 1st 77.6 83.1 average 93%
Viewbank 17.6 -0.2 31.0 23rd 7.6 -0.3 0.8 1st 47.2 56.2 average 84%
Wonthaggi 16.3 +0.2 24.4 23rd 7.8 0.0 3.6 1st 145.0 89.9 v high 161%
West Central (district 87)
Avalon Airport 18.0 +0.3 25.2 21st 6.5 -0.3 -1.7 1st 23.6 45.5 low 52%
Breakwater (Geelong Racecourse) 17.1   23.2 21st 7.1   0.7 1st 68.2
Laverton RAAF 18.1 +1.1 31.3 23rd 7.3 +0.6 -0.5 1st 20.8 49.0 v low 42%
Sheoaks 15.3 -0.2 23.8 22nd 5.7 -0.6 -1.5 1st 51.2 49.1 average 104%
North Central (district 88)
Castlemaine Prison 16.4 +0.7 28.6 23rd 5.9 +0.9 -1.0 1st 26.7 61.6 low 43%
Eildon Fire Tower 13.0 -0.6 25.0 23rd 4.9 -0.9 0.8 5th 48.4 65.2 average 74%
Lake Eildon 16.7 +0.1 28.5 23rd 5.7 +0.1 -0.2 17th 59.6 81.9 average 73%
Mangalore Airport 17.3 +0.5 31.8 23rd 3.5 -1.8 -2.3 17th 9.8 55.0 v low 18%
Maryborough 17.0 +0.3 30.1 23rd 5.3 -0.1 -1.0 1st 30.7 52.2 average 59%
Redesdale 17.0 +0.7 29.1 23rd 3.5 -0.7 -2.8 1st 21.2 53.5 low 40%
Wallan (Kilmore Gap) 13.4 +0.2 24.2 23rd 5.2 -0.5 1.1 5th 38.2 62.5 low 61%
Western Plains (district 89)
Ararat Prison 16.0 +0.8 26.5 23rd 5.6 +0.5 -1.2 17th 49.4 61.8 average 80%
Ballarat Aerodrome 14.3 +0.4 25.6 23rd 4.1 -0.7 -2.2 17th 50.4 71.8 low 70%
Westmere 15.1 -0.7 24.0 23rd 5.1 +0.1 -0.8 17th 56.6 50.7 high 112%
West Coast (district 90)
Aireys Inlet 16.1 -0.1 22.2 21st 7.5 -0.7 2.8 5th 73.2 60.1 high 122%
Cape Nelson Lighthouse 15.5 -0.4 20.1 27th 8.7 -0.8 3.7 17th 93.2 74.6 high 125%
Cape Otway Lighthouse 15.0 -0.2 21.9 22nd 8.5 0.0 4.3 5th 150.0 90.3 v high 166%
Casterton 15.6 -0.8 23.5 22nd 6.3 +0.1 0.3 17th 105.8 68.3 high 155%
Colac (Mount Gellibrand) 14.1 -0.5 22.0 22nd 5.8 -0.7 0.9 5th 102.8 56.5 high 182%
Dartmoor 15.7   24.4 22nd 6.6   -0.1 17th 109.8
Hamilton Airport 15.0 -0.3 22.8 22nd 5.9 +0.1 -0.7 17th 72.0 68.3 average 105%
Mortlake Racecourse 15.9 +0.1 23.2 22nd 5.9 +0.2 0.7 17th 69.6 58.1 high 120%
Port Fairy AWS 16.1 -0.5 23.1 22nd 8.1 -0.2 2.9 17th 96.2 70.1 highest 137%
Portland (Cashmore Airport) 15.2 -0.1 22.5 22nd 7.6 +0.1 2.5 17th 124.8 87.6 high 142%
Warrnambool Airport NDB 15.5 -0.6 22.4 22nd 6.7 -0.1 0.6 17th 141.6 75.4 v high 188%

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 9 am on Monday 2 October 2017. 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
Enquiries