Wednesday, 1 September 2021 - Monthly Climate Summary for Western Australia - Product code IDCKGC11R0

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.

Extremes Maps Records Summaries Important notes the top

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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

Extremes Maps Records Summaries Important notes the top

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Maps
	Observed	Anomaly	Decile rank
Total rainfall
Mean daily maximum temperatures
Mean daily minimum temperatures

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

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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

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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

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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

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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

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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

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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

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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

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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

Extremes Maps Records Summaries Important notes the top

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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%

Extremes Maps Records Summaries Important notes the top

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