Western Australia in August 2021: dry in the south

Rainfall was below average for most of the southern half of Western Australia, while eastern parts and the far west of the Pilbara recorded above average rainfall. Mean maximum temperatures were above average across most of the state. Areas of above mean minimum temperatures were in the north-west coastal areas and a large part of the state's south.

Dry in the south

  • Western Australia's August rainfall was 50% below average, which was the driest August since 2014.
  • Rainfall was below average in most of the southern half of WA, although rainfall was above average in the far west and eastern parts of the Pilbara.
  • Daily rainfall of 30–80 mm was recorded in the South West District on the 8th during the passage a cold front; Cowaramup, to the north of Margaret River, recorded 77.4 mm on the 8th, which was 10 mm more than its previous August daily rainfall record.
  • A trough over the west Pilbara produced 3 days of showers around the Exmouth between the 8th and 10th; Learmonth Airport recorded 30.8 mm in total, which was its highest total August rainfall for 23 years.

Above average daytime temperature across most of WA

  • Western Australia's mean temperature was 1.23 °C above average, and the equal eleventh-highest mean temperature for August on record.
  • Western Australia's mean maximum temperature was 1.76 °C above average, and the tenth-highest mean maximum temperature for August on record.
  • Broome Airport recorded 6 hot days in total with daily maximum temperatures of 35 °C, compared to August average of 1 hot day, and resulting in Broome had its highest August mean maximum temperature in 82 years of record.
  • Kulumburu in the north Kimberley recorded 4 very hot days with daily maximum temperature of 38 °C, which were 38.3 °C( 23rd), 38.5 °C(24th), 38.7 °C (30th) and 38.6 °C (31st), all equalling or exceeding its previous August temperature record.
  • Kulumburu's mean maximum temperature of 35.6 °C was its second-highest August mean maximum temperature on record, behind 35.9 °C in 2020.
  • Wyndham Aero recorded the state and the country's highest temperature of the month with 39.0 °C on 31 August.
  • In the state's south-west, the coldest days were the 1st and 10th, with daily maxima down to 10 °C or below, including a number of coldest August day records; Katanning in the Great Southern District recorded 9.5 °C on the 1st, which was a record, and also the lowest August maximum temperature since 1992 at Katanning when 9.5 °C was recorded on 28 August at the old Katanning site.
  • Western Australia's mean minimum temperature was 0.7 °C above average.
  • Karratha Aero and Roebourne Aero experienced a very warm night on the 16th with overnight temperatures remained above 23 °C, which was their warmest August night on record respectively.

Thunderstorms, damaging winds, hail and snow in the south-west WA

  • On the 1st, 9th and 10th: strong cold fronts produced thunderstorms and damaging winds in Perth and the south-west of WA. Wind gusts in excess of 90 km/h were reported at coastal sites and a number of inland locations in the Lower West and South West districts from Lancelin (north of Perth) down to Cape Luuewin.
  • Houses were damaged in Perth northern suburbs on the 1st, while hail was reported in southern suburbs on the 10th.
  • Bluff Knoll in the Stirling Range in the South Coastal District reported a dusting of snow on two occasions in August: from the last day of July till 1 August, and on 10 August.

Further information

Media
(03) 9669 4057

Extremes in August 2021
Hottest day 39.0 °C at Wyndham Aero on the 31st
Warmest days on average 35.6 °C at Kalumburu
Coolest days on average 15.6 °C at Katanning
Coldest day 8.7 °C at Rocky Gully on the 10th
Coldest night -4.9 °C at Eyre on the 13th
Coolest nights on average 3.1 °C at Eyre
Warmest nights on average 24.0 °C at Troughton Island
Warmest night 25.8 °C at Troughton Island on the 17th
Warmest on average overall 27.2 °C at Troughton Island
Coolest on average overall 10.5 °C at Newdegate Research Station
Wettest overall 225 mm at North Walpole
Wettest day 77.4 mm at Cowaramup on the 8th
Strongest wind gust 128 km/h at Cape Leeuwin on the 9th

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 August daily rainfall
New record
(mm)
Old
record
Years of
record
Cowaramup 77.4 on the 8th 67.3 on the 16th in 1958 83
Thevenard Island 15.4 on the 16th 14.4 on the 7th in 2016 25
Acton Park 70.6 on the 8th 56.4 on the 12th in 2010 21



Record highest August total rainfall
New record
(mm)
Old
record
Years of
record
Average for
August
Thevenard Island 16.4 = 16.4 in 2016 25 3.4

Highest August total rainfall for at least 20 years
Observed
(mm)
Most recent
higher
Average for
August
Learmonth Airport 30.8 46.8 in 1998 11.6
Onslow Airport 12.0 33.6 in 1998 8.2
Exmouth Gulf 25.4 37.8 in 1998* 11.9

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




Record highest August temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Kalumburu 38.7 on the 30th 38.1 on the 27th in 2020 23 33.8
Witchcliffe 22.8 on the 16th 22.7 on the 16th in 2015 23 16.7



Record lowest August daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Lake Grace 11.0 on the 10th = 11.0 on the 3rd in 2020 25 16.8
Busselton Aero 11.9 on the 10th 12.0 on the 27th in 2004 24 17.3
Katanning 9.6 on the 1st 9.8 on the 4th in 2018 23 15.4



Record highest August mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Broome Airport 32.2 32.1 in 2017 82 30.4
Troughton Island 30.4 = 30.4 in 1998 41 28.9



Record highest August daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Pearce RAAF 16.8 on the 17th 16.3 on the 7th in 2013 62 8.2
Cygnet Bay 23.3 on the 4th = 23.3 on the 9th in 1988 36 14.8
Karratha Aero 23.3 on the 16th 21.4 on the 28th in 2000 29 14.3
Roebourne Aero 23.3 on the 16th 21.1 on the 28th in 2016 21 12.5



Record highest August mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Kalumburu 17.6 16.7 in 2005 22 14.6

Highest August mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
August
Curtin Aero 17.5 =17.5 in 1998 15.7
Troughton Island 24.0 24.2 in 1998 22.6



Record highest August mean temperature
New record
(°C)
Old
record
Years of
record
Average for
August
Thevenard Island 22.8 22.7 in 2020 23 21.7
Kalumburu 26.6 25.8 in 2020 22 24.2
Wyndham Aero 26.8 = 26.8 in 2020 20 25.1

Highest August mean temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
August
Broome Airport 23.8 23.9 in 1998 22.6
Curtin Aero 25.9 26.2 in 1998 24.4
Mandora 23.4 24.2 in 1998 22.1
Troughton Island 27.2 27.3 in 1998 25.8



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
North Kimberley (district 01)
Doongan 32.5 +0.9 35.5 31st 13.7 +1.5 7.5 9th 0 0.8 lowest 0%
Kalumburu 35.6 +1.8 38.7 30th 17.6 +3.0 12.3 9th 0 0.3 lowest 0%
Troughton Island 30.4 +1.5 31.9 4th 24.0 +1.4 22.2 10th 0.4 0.5 average 80%
Truscott 33.4 +1.6 36.3 31st 20.0 +1.1 16.5 10th 0.6 0.4 high 150%
Wyndham Aero 35.4 +1.4 39.0 31st 18.1 +2.0 10.8 9th 0 0 lowest
East Kimberley (district 02)
Argyle Aerodrome 33.4 +1.2 37.6 31st 18.9 +1.5 12.4 7th 0 0.3 lowest 0%
Halls Creek Airport 30.9   35.4 31st 13.1   6.9 9th 0
Kununurra Aero 34.1 +1.3 38.4 31st 16.2 +0.7 9.6 8th 0 0.1 lowest 0%
Warmun 33.0 +0.7 37.5 31st 16.6 +1.8 10.0 9th 0 1.3 lowest 0%
West Kimberley (district 03)
Bidyadanga 33.3 +2.2 37.0 23rd 14.7 -0.2 9.0 10th 1.2 2.3 high 52%
Broome Airport 32.2 +1.8 36.4 23rd 15.5 +0.6 9.6 10th 0.2 2.1 low 10%
Curtin Aero 34.3 +1.1 37.7 31st 17.5 +1.8 12.8 22nd 0 2.1 lowest 0%
Cygnet Bay 30.5 +0.8 34.4 31st 17.2 +2.4 12.2 19th 0 0.9 lowest 0%
Derby Aero 34.4 +1.7 37.7 31st 15.9 +0.1 9.2 9th 0.4 1.1 high 36%
Fitzroy Crossing Aero 34.3 +0.9 38.3 31st 14.3 +0.7 6.6 18th 0 2.6 lowest 0%
Yampi Sound (Defence) 35.3   38.4 30th 12.6   6.0 18th 0
De Grey (district 04)
Bedout Island 26.6 +0.2 31.1 15th 20.6 +0.4 18.6 12th
Karratha Aero 29.5 +1.2 34.3 16th 15.6 +1.3 11.4 4th 0 4.0 lowest 0%
Legendre Island 26.1 -0.1 29.7 16th 19.5 +0.9 16.5 1st
Mandora 32.8 +1.9 36.5 23rd 14.0 +0.9 7.0 9th 3.4 2.5 high 136%
Marble Bar 31.5 +1.2 36.1 31st 13.7 +0.6 9.6 7th 0 0.7 lowest 0%
Port Hedland Airport 30.9 +1.6 34.4 15th 14.5 +1.3 10.0 3rd 1.8 4.6 average 39%
Roebourne Aero 31.0 +0.7 35.1 16th 13.5 +1.0 9.5 1st 0.2 0.8 average 25%
Fortescue (district 05)
Barrow Island Airport 25.5 +0.3 28.5 29th 18.5 +0.7 14.2 3rd 0.8 2.6 low 31%
Karijini North 28.8   33.3 31st 13.9   4.2 3rd 0
Learmonth Airport 27.1 +0.6 31.8 29th 12.4 +0.3 5.6 4th 30.8 11.6 high 266%
Mardie 31.3 +1.7 36.1 16th 13.8 +1.3 8.8 3rd 0.2 7.0 average 3%
Onslow Airport 29.0 +1.6 34.1 22nd 15.4 +1.8 10.4 4th 12.0 8.2 high 146%
Thevenard Island 27.0 +0.9 31.2 22nd 18.5 +1.0 15.5 11th 16.4 3.4 highest 482%
West Gascoyne (district 06)
Carnarvon Airport 24.3 +1.1 29.5 24th 10.9 -0.7 4.4 13th 0.8 17.1 v low 5%
Denham 23.0 +0.4 28.5 24th 14.9 +1.6 11.0 4th 8.4 21.8 low 39%
Emu Creek Station 28.7 +1.1 35.0 17th 12.6 +0.3 6.0 3rd 9.9 10.7 high 93%
Murchison 24.4 +1.3 31.5 17th 6.5 -0.7 -0.8 13th 3.1 18.2 low 17%
Shark Bay Airport 24.5 +0.4 29.4 24th 11.1 0.0 5.4 13th 10.0 20.0 average 50%
East Gascoyne (district 07)
Newman Aero 26.8 +0.6 32.3 31st 8.7 +0.7 -0.1 12th 0 6.3 lowest 0%
Murchison (district 07A)
Meekatharra Airport 23.0 +1.4 29.2 18th 9.6 +1.0 2.5 2nd 2.8 10.7 low 26%
Mount Magnet Aero 21.7 +0.4 29.2 17th 8.1 0.0 2.1 2nd 2.4 15.8 low 15%
Paynes Find 20.2 0.0 27.7 17th 5.6 -0.4 0.2 2nd 2.2 26.8 v low 8%
North Coast (district 08)
Dalwallinu 17.9 -0.4 24.2 25th 6.0 -0.1 1.1 24th 25.8 39.9 low 65%
Geraldton Airport 21.0 -0.2 26.7 16th 8.8 -0.2 4.0 13th 39.6 59.8 low 66%
Kalbarri 23.5 +1.0 29.6 24th 10.9 +0.9 6.0 2nd 19.9 47.6 low 42%
Morawa Airport 19.9 -0.4 27.8 25th     1.3 5th 12.6 34.0 v low 37%
Mullewa 21.2 +0.9 29.4 25th 7.7 +0.5 3.1 11th 16.4 42.2 low 39%
North Island 21.7 +0.1 24.5 25th 15.8 +0.5 13.5 20th 18.8 35.3 low 53%
Wongan Hills 18.6 +0.6 25.5 17th 7.0 +0.3 1.8 2nd 36.6 51.9 low 71%
Central Coast (district 09)
Badgingarra Research Stn 18.4 +0.1 24.4 25th 8.1 +1.0 4.2 28th 56.4 83.9 low 67%
Bickley 16.0 0.0 22.8 17th 8.1 +0.5 4.5 24th 110.4 174.9 low 63%
Garden Island HSF 18.5 +0.4 24.4 16th 11.4 +0.2 6.0 2nd 67.0 94.3 v low 71%
Gingin Aero 19.5 +0.4 26.1 16th 7.7 +1.1 1.3 6th 64.4 106.8 low 60%
Jandakot Aero 19.2 +0.5 25.3 16th 8.6 +1.4 2.1 2nd 79.8 127.3 low 63%
Jurien Bay 20.9 +0.9 28.1 16th 9.8 +0.4 4.3 6th 42.8 79.6 low 54%
Karnet 16.4 +0.4 22.9 17th 7.2 +0.9 2.4 4th 135.0 183.3 low 74%
Millendon (Swan Valley) 19.4   25.6 17th 8.7   2.7 2nd 66.2
Pearce RAAF 19.3 +0.9 25.5 17th 9.6 +1.4 3.9 2nd 86.0 105.6 low 81%
Perth Airport 19.5 +0.9 26.1 17th 9.2 +1.1 2.9 2nd 50.8 117.8 v low 43%
Perth Metro 19.6 +0.5 25.1 17th 9.3 +1.0 3.6 6th 56.6 122.0 v low 46%
Rottnest Island 18.6 +0.7 23.7 16th 12.6 +0.2 7.2 2nd 31.8 86.5 lowest 37%
Swanbourne 19.0 +0.1 25.3 16th 10.9 +0.8 6.0 5th 61.2 115.7 v low 53%
South Coast (district 09A)
Albany 17.2 +0.8 22.6 17th 9.5 +1.1 6.1 11th        
Albany Airport 17.5   23.0 17th 7.6   2.7 7th 97.4
Bridgetown 16.8 +0.4 22.6 17th 5.5 +0.5 0.6 6th 100.8 120.0 low 84%
Bunbury 17.9 +0.2 23.7 16th 8.6 +1.0 4.1 6th 108.2 117.7 average 92%
Busselton Aero 17.3 0.0 22.9 16th 7.5 +0.3 2.9 6th 99.0 106.7 average 93%
Cape Leeuwin 17.6 +1.1 23.0 16th 11.9 +0.6 7.9 2nd 89.4 135.0 low 66%
Cape Naturaliste 17.9 +1.4 22.3 17th 10.6 +0.5 6.9 23rd 98.4 112.4 average 88%
Collie East 17.5 +0.3 23.7 17th 4.9 +0.2 -0.7 6th 91.4 113.8 average 80%
Donnybrook 18.3 +1.0 24.0 17th       107.3 148.0 low 73%
Dwellingup 16.7 +1.0 22.8 16th 6.5 +1.0 0.6 5th 163.6 193.4 average 85%
Esperance 18.6 +0.6 23.9 7th 8.9 +0.2 4.9 14th 76.0 85.7 average 89%
Esperance Aero 17.7 +0.3 23.1 17th 7.9 +0.2 3.9 11th 59.6 72.0 average 83%
Hopetoun North 19.0 +0.3 25.8 17th 8.4 +0.6 3.5 16th 36.8 57.3 low 64%
Jarrahwood 17.4 +0.5 23.5 16th 5.5 +0.3 -0.5 6th 121.6 145.3 average 84%
Mandurah 18.2 +0.1 25.0 16th 11.5 +0.5 6.5 2nd 48.6 93.1 v low 52%
Manjimup 16.2 +1.1 23.8 17th 7.2 +0.7 4.1 11th 121.6 144.5 average 84%
North Walpole 16.9 +0.3 22.4 17th 8.9 -0.2 5.7 11th 225.0 163.8 high 137%
Rocky Gully 16.0 +0.6 22.3 17th 6.8 0.0 1.7 23rd 104.4 93.6 average 112%
Shannon 15.6 +0.1 21.5 17th 7.1 +0.2 2.4 23rd 157.8 137.0 average 115%
Windy Harbour 17.6 +0.7 23.0 16th 8.4 -0.6 4.1 16th 218.2 164.4 v high 133%
Witchcliffe 17.2 +0.5 22.8 16th 8.2 0.0 3.0 6th 153.6 157.7 average 97%
North Central (district 10)
Bencubbin 18.0 +0.3 25.3 17th 6.8 +0.8 1.5 2nd 11.8 37.3 v low 32%
Cunderdin Airfield 18.1 +0.1 24.7 17th 5.5 +1.0 0.9 5th 44.8 41.5 average 108%
Merredin 18.2 +0.7 25.5 17th 6.5 +0.9 0.0 2nd 23.6 39.2 low 60%
Northam 18.4 +0.4 25.6 17th 6.8 +1.2 1.4 2nd 70.4 60.9 average 116%
York 18.1 +0.1 24.5 17th 4.7 +0.8 0.4 2nd 44.2 57.9 low 76%
South Central (district 10A)
Beverley 18.5 +0.7 24.6 17th 5.7 +0.6 1.4 2nd 39.8 58.7 low 68%
Brookton 17.3 +0.5 23.5 17th 4.9 +0.3 0.0 2nd 41.5 62.1 low 67%
Hyden 18.6 +1.0 24.0 16th     -1.5 11th 21.7 40.8 low 53%
Jacup 17.3 +0.5 24.2 17th 5.6 -0.1 2.5 15th 24.0 51.5 low 47%
Katanning 15.6 +0.2 21.3 17th 5.8 -0.1 1.6 23rd 36.4 59.7 v low 61%
Lake Grace 16.9 +0.1 21.0 16th 6.0 +0.4 1.3 14th 41.6 36.9 average 113%
Narrogin 16.7 +1.3 23.0 17th 5.8 +0.6 1.0 5th 64.4 67.7 average 95%
Newdegate Research Station 16.2 -0.1 20.3 17th 4.7 +0.4 -0.4 14th 54.0 44.6 high 121%
Pingelly 17.0 +0.8 22.9 17th 6.2 +0.5 1.0 11th 41.4 62.1 low 67%
Ravensthorpe 17.9 +0.6 23.5 17th 7.0 +0.3 3.2 14th 27.7 45.4 low 61%
Wagin 16.4 +0.3 22.7 17th 5.6 -0.1 1.8 6th 50.3 56.6 average 89%
Wandering 16.7 +0.2 24.0 17th 4.6 +0.5 -0.8 6th 65.4 92.2 low 71%
Eucla (district 11)
Balladonia 20.8 +1.5 27.6 18th 4.9 -0.4 -2.0 24th 12.8 21.0 average 61%
Eucla 20.5 +1.3 30.2 9th 7.9 +0.4 3.2 1st 8.4 26.3 low 32%
Eyre 20.9 +1.4 28.8 8th 3.1 -2.9 -4.9 13th 11.1 30.1 low 37%
Forrest 21.4 +0.4 29.2 9th 6.0 +0.1 2.0 6th 9.2 13.0 average 71%
South East (district 12)
Bulga Downs 22.2 +0.1 29.8 17th 6.1 -0.1 -1.0 2nd 2.3 15.2 low 15%
Kalgoorlie-Boulder Airport 19.8 +1.1 27.6 18th 6.4 +0.7 0.8 4th 4.8 21.0 low 23%
Laverton Aero 21.6 +0.7 30.1 18th 7.7 +0.4 1.9 12th 1.6 9.5 low 17%
Leinster Aero 22.2 +0.5 29.8 18th 7.6 -0.1 0.6 3rd 1.0 8.6 low 12%
Leonora Aero 21.5 -0.2 30.1 18th 7.6 +0.1 1.3 12th 8.2 10.9 average 75%
Norseman Aero 19.8 +0.6 25.2 17th 5.0 +0.5 -1.6 23rd 12.4 23.0 low 54%
Salmon Gums Res.Stn. 18.2 +0.8 24.5 17th 4.5 -0.2 -3.1 24th 19.2 34.2 low 56%
Southern Cross Airfield 18.9 +0.4 26.1 17th 4.8 +0.9 -0.7 14th 16.0 30.1 low 53%
North East (district 13)
Carnegie 26.3 +2.1 33.0 19th 8.4 +1.0 1.8 12th 0 6.5 lowest 0%
Giles Meteorological Office 24.1 +1.3 31.1 22nd 8.8 +0.1 1.2 3rd 0 9.8 lowest 0%
Telfer Aero 29.4 +0.9 34.4 31st 13.0 +0.4 7.1 6th 0 4.6 lowest 0%
Warburton Airfield 24.5 +1.1 31.3 20th 8.5 +1.2 1.8 1st 0 8.6 lowest 0%
Wiluna Aero 23.9   31.8 18th 7.6   1.6 12th 0.4
Offshore Islands (district 200)
Adele Island 29.2   31.7 30th 24.2   22.1 7th
Rowley Shoals 26.4   27.7 28th 24.1   22.4 3rd
Varanus Island 25.6 +0.2 28.1 28th     17.8 1st 0 1.0 lowest 0%

Notes

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

Media
(03) 9669 4057

Climate