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Perth, Western Australia climate

Csa Hot-summer Mediterranean

Perth has a mildly seasonal warm-temperate climate (Hot-summer Mediterranean, Köppen Csa). The hottest month is February with an average daily high near 89°F, while the coldest is July averaging around 46°F at night. Precipitation totals about 29 inches a year and is strongly seasonal — July alone averages 5.6 inches while December barely receives 0.41 inches.

☀️ Summers

Hot

Highs near 89°F in February.

About 52 days a year above 90 °F

❄️ Winters

Cool

Lows near 46°F in July.

🌧️ Rain

Moderate rainfall

About 29 in of rain a year.

Wettest in July

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

+0.3 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Perth climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	88	89	85	79	72	67	65	66	69	74	80	85
Avg temp (°F)	76	77	74	68	61	57	56	57	59	64	69	73
Avg low (°F)	65	65	62	57	51	48	46	47	49	53	58	62
Precipitation (in)	0.8	0.5	0.8	1.4	3.5	5.0	5.6	4.9	3.3	1.5	1.0	0.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	88	89	85	79	72	67
Avg temp (°F)	76	77	74	68	61	57
Avg low (°F)	65	65	62	57	51	48
Precipitation (in)	0.8	0.5	0.8	1.4	3.5	5.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	65	66	69	74	80	85
Avg temp (°F)	56	57	59	64	69	73
Avg low (°F)	46	47	49	53	58	62
Precipitation (in)	5.6	4.9	3.3	1.5	1.0	0.4

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	3	2	5	7	11	15	17	16	15	9	6	4
Days with high ≥ 90°F (days)	13	13	9	2	0.1	—	—	—	0.1	1	5	9
Days with low ≤ 32°F (days)	—	—	—	—	—	0.1	0.3	—	—	—	—	—

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	3	2	5	7	11	15
Days with high ≥ 90°F (days)	13	13	9	2	0.1	—
Days with low ≤ 32°F (days)	—	—	—	—	—	0.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	17	16	15	9	6	4
Days with high ≥ 90°F (days)	—	—	0.1	1	5	9
Days with low ≤ 32°F (days)	0.3	—	—	—	—	—

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	34	36	40	50	54	58	59	57	54	46	44	36
Clear days (≤ 30% cloud)	16	15	15	10	8	5	5	7	7	11	12	15
Partly cloudy days (30–70%)	10	9	10	11	13	13	14	12	12	13	12	12
Cloudy days (≥ 70%)	4	4	6	9	10	12	12	12	10	8	7	4
Relative humidity (%)	64	64	66	68	69	72	73	74	74	73	70	65
Wind speed (mph)	12.5	12.1	11.6	10.6	11.0	11.9	11.9	11.5	11.4	11.4	12.1	12.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	34	36	40	50	54	58
Clear days (≤ 30% cloud)	16	15	15	10	8	5
Partly cloudy days (30–70%)	10	9	10	11	13	13
Cloudy days (≥ 70%)	4	4	6	9	10	12
Relative humidity (%)	64	64	66	68	69	72
Wind speed (mph)	12.5	12.1	11.6	10.6	11.0	11.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	59	57	54	46	44	36
Clear days (≤ 30% cloud)	5	7	7	11	12	15
Partly cloudy days (30–70%)	14	12	12	13	12	12
Cloudy days (≥ 70%)	12	12	10	8	7	4
Relative humidity (%)	73	74	74	73	70	65
Wind speed (mph)	11.9	11.5	11.4	11.4	12.1	12.5

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 27 years of daily observations at Perth Metro, a weather station, about 4 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →