Climate averages 1991–2020

Perth weather
in August.

A mild, moderately wet month: the 11th warmest and the 10th driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 17.2°C Daytime mean, August

Average low 9.6°C Night-time mean, August

Rainfall 89 mm 11 days with ≥1 mm

Daylight 11 h Sunrise to sunset, per day

August is a mild month in Perth: daytime highs average 17.2°C and nights cool to about 9.6°C. By daytime temperature it is the 11th warmest of the 12 months.

Expect about 89 mm of rain on roughly 11 days, which makes August a moderately wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 57 min on an average August day.

The nearest other city in this atlas is Mandurah (65 km away). In August its highs average 16.8°C, about as warm as Perth, with 96 mm of rain.

Among the 32 cities listed in Australia, Perth ranks 17th of 32 for the warmest August highs and 30th of 32 for the driest August (rainfall, lowest first). The mean August high of those 32 cities is 17.6°C; Perth is 0.4°C cooler than that mean.

From August to September, average highs rise by 1.3°C to 18.5°C, and monthly rainfall falls from 89 mm to 55 mm.

The annual picture

August in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Perth climate table

1991–2020

Monthly climate averages for Perth, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	31.2°C18.8°C	18.8°C	17	1.8	14.014 h
February	31.2°C19.2°C	19.2°C	16	1.5	13.213 h
March	28.9°C17.8°C	17.8°C	17	2.3	12.312 h
April	24.8°C15.3°C	15.3°C	24	4.1	11.311 h
May	20.9°C12.4°C	12.4°C	67	7.8	10.511 h
June	17.9°C10.5°C	10.5°C	98	10.7	10.110 h
July	16.7°C9.5°C	9.5°C	102	12.5	10.310 h
August, selected	17.2°C9.6°C	9.6°C	89	11.0	11.011 h
September	18.5°C10.4°C	10.4°C	55	8.5	11.912 h
October	22.0°C12.2°C	12.2°C	27	4.7	12.913 h
November	25.7°C14.9°C	14.9°C	19	3.7	13.714 h
December	29.0°C17.1°C	17.1°C	9.3	1.6	14.214 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

August in nearby cities

Distance from Perth

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Perth) is explained once on the Perth year overview and on the Sources, method and limits page.