Climate averages 1991–2020

Perth weather
in July.

A mild, wet month: the coolest and the wettest of the year.

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

Average high 16.7°C Daytime mean, July

Average low 9.5°C Night-time mean, July

Rainfall 102 mm 13 days with ≥1 mm

Daylight 10 h Sunrise to sunset, per day

July is a mild month in Perth: daytime highs average 16.7°C and nights cool to about 9.5°C. By daytime temperature it is the coolest month of the year.

Expect about 102 mm of rain on roughly 13 days, which makes July a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 10 h 16 min on an average July day.

The nearest other city in this atlas is Mandurah (65 km away). In July its highs average 16.4°C, about as warm as Perth, with 111 mm of rain.

Among the 32 cities listed in Australia, Perth ranks 13th of 32 for the warmest July highs and 30th of 32 for the driest July (rainfall, lowest first). The mean July high of those 32 cities is 16.5°C; Perth is 0.2°C warmer than that mean.

From July to August, average highs rise by 0.5°C to 17.2°C, and monthly rainfall falls from 102 mm to 89 mm.

The annual picture

July 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, selected	16.7°C9.5°C	9.5°C	102	12.5	10.310 h
August	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

July 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.