Perth weather in August

In August, Perth sees average daytime highs of 18°C and overnight lows near 11°C, with 89 mm of rain across 11.1 wet days and about 10.8 hours of daylight. It is the 11th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 18°C through the month. The sky is clear or mostly clear about 35% of the time in August, and the air most often feels dry.

Daylight stretches from about 10 h 24 min at the start of August to 11 h 18 min by month's end. Set against the rest of the year, August is Perth's 11th-clearest and 9th-windiest month. For the whole year in context, see Perth's year-round climate.

Daytime high
18°
11th warmest
Overnight low
11°
2nd coldest
Rainfall
89 mm
11.1 wet days
Daylight
10 h 48 min
6:56 AM – 5:45 PM
Cloud cover
48%
11th clearest
Wind
17 km/h
9th windiest
Solar energy
3.55 kWh/m²
Travel score
5.8
out of 10

Perth is capital city of Western Australia, Australia.

Air quality
Good
PM2.5 6.8 µg/m³ · 2019
Density
372/km²
people per km²
Founded
1829

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 18°C through the month.

A typical August day in Perth reaches about 18°C in the afternoon and slips back to 11°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 20°C. Set against its neighbours, August runs on par with July and about 1°C cooler than September.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11711
21711
31711
41711
51711
61711
71811
81811
91811
101811
111811
121811
131811
141811
151811
161811
171811
181811
191811
201811
211811
221811
231811
241811
251811
261811
271811
281811
291811
301811
311811

Perth weather by month

How August compares with the rest of the year at a glance. August is the 11th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 19°171.813.97.4
Feb29° / 20°171.513.27.2
Mar27° / 19°182.312.27.8
Apr24° / 16°244.111.28.1
May21° / 14°677.810.47.1
Jun18° / 12°9810.7106.1
Jul17° / 11°10212.510.15.5
Aug18° / 11°8911.110.85.8
Sep19° / 12°558.511.86.5
Oct21° / 13°274.712.87.6
Nov24° / 16°193.713.68.4
Dec27° / 18°91.614.18.4

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 30% of August, with mostly cloudy or overcast conditions the remaining 35%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16337
26337
36337
46238
56238
66238
76337
86337
96238
106337
116436
126436
136535
146535
156535
166634
176634
186733
196832
206733
216733
226733
236733
246733
256733
266634
276733
286733
296634
306634
316634

Chance of precipitation in August

Any precipitation

Perth gets around 89 mm of rain over 11.1 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
140
240
340
440
540
640
739
839
939
1038
1138
1237
1337
1436
1535
1634
1734
1833
1933
2032
2132
2232
2332
2432
2533
2633
2733
2834
2934
3035
3135

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the dry band about 92% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19271
29271
39271
49271
59271
69271
79271
89271
99370
109370
119370
129280
139280
149280
159280
169280
179280
189280
199370
209370
219370
229370
239280
249280
259280
269280
279370
289370
299370
309370
319370

Wind in August

Winds average 17 km/h in August.

Across August, daily wind ranges from about 17 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze
3117light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 10 h 24 min at the start of August to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over August. Sunrise moves from 7:10 AM to 6:38 AM, and sunset from 5:35 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.47:105:35
210.47:095:36
310.57:085:37
410.57:085:37
510.57:075:38
610.57:065:39
710.67:055:39
810.67:045:40
910.67:035:41
1010.77:025:41
1110.77:015:42
1210.77:005:43
1310.76:595:43
1410.86:585:44
1510.86:575:45
1610.86:565:45
1710.86:555:46
1810.96:545:47
1910.96:535:47
2010.96:525:48
2111.06:505:49
2211.06:495:49
2311.06:485:50
2411.16:475:51
2511.16:465:51
2611.16:445:52
2711.26:435:52
2811.26:425:53
2911.26:415:54
3011.26:395:54
3111.36:385:55

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 3.55 kWh/m².

For context, solar energy here swings from a low near 2.58 kWh/m² to a high of 8.43 kWh/m² in December across the year — August's 3.55 kWh/m² falls in the middle.

012345151015202531
Solar energy (kWh/m²)Level
13.0Moderate
23.0Moderate
33.1Moderate
43.1Moderate
53.1Moderate
63.1Moderate
73.2Moderate
83.2Moderate
93.3Moderate
103.3Moderate
113.3Moderate
123.4Moderate
133.4Moderate
143.5Moderate
153.5Moderate
163.5Moderate
173.6Moderate
183.6Moderate
193.7Moderate
203.7Moderate
213.8Moderate
223.8Moderate
233.8Moderate
243.9Moderate
253.9Moderate
264.0Moderate
274.0Moderate
284.0Bright
294.0Bright
304.1Bright
314.1Bright
Planning a trip in August

Hazard calendar for Perth

In seasonPeak

In August, Perth sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Perth sits in the South Indian Ocean cyclone belt; the season peaks January–March.

Perth's rainy season runs May–September, when most of the year's rain falls.

Cyclone
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Perth?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.8
Sightseeing
11th-best month of the year
1.7
Beach & pool
11th-best month of the year

August is a reasonable time to visit Perth for sightseeing.

What to pack for Perth in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Perth sees daytime highs around 18°C and nights near 11°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Perth in August

The nearest coast averages about 19°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 24 km away) is warmest in February at about 22°C and coldest in September near 19°C.

It's comfortable for a long swim from Nov 22 to Jul 12 — about 7.7 months when the water holds above 20°C.

18°20°22°24°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb22Refreshing
Mar22Refreshing
Apr22Refreshing
May22Refreshing
Jun21Refreshing
Jul20Cool
Aug19Cool
Sep19Cool
Oct19Cool
Nov20Cool
Dec21Refreshing

UV index in Perth in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Perth peaks around December 23 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeModerateVery highExtremeDec 23UV 13Jun 21UV 3
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar11Extreme
Apr6High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug5Moderate
Sep8Very high
Oct9Very high
Nov10Extreme
Dec13Extreme
Location & terrain

Where is Perth?

Perth sits at 32.0°S, 115.9°E, 34 m above sea level, in Australia. The nearest listed city is Dianella, 7.0 km away.

Topography around Perth

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Perth.

Within 3 km, the terrain around Perth has only modest variations in elevation — a maximum elevation change of 73 m around an average of 18 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 139 m; within 80 km, significant variations in elevation — a maximum elevation change of 564 m.

The land around Perth is covered by artificial surfaces (55%) and water (20%) within 3 km, artificial surfaces (56%) within 16 km, and trees (41%) and water (32%) within 80 km.

3 km
73 m
16 km
139 m
80 km
564 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Dianella 7.0 km · Morley 8.0 km · Scarborough 11 km · Willetton 11 km · Ballajura 13 km · Canning Vale 13 km · Thornlie 15 km · Duncraig 16 km

Australia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type I
230 V · 50 Hz
Prices
≈ 90% of US
price level, 2025
GDP per capita
$65,130
2025
Happiness
6.9 / 10
World Happiness, 2025
Homicide rate
0.9
per 100k, 2023
Road deaths
4.9
per 100k/yr, 2019
Income group
High
World Bank
Religion
none 38%Roman Catholic 20%Protestant 18%other Christian 4%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Perth (-31.9522°, 115.8614°, elevation 34 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).