Perth, Australia Climate & Monthly Averages
The climate of Perth
Perth runs on a dry-summer rhythm: the warmest months are also the driest. December averages 9 mm (0.3 in) while the wet season peaks in July at 4.6 inches (117 mm). Highs range from 64°F (18°C) to 86°F (30°C).
Climate quick facts
- Hottest month: February - highs near 86°F (30°C)
- Coldest month: August - highs near 64°F (18°C)
- Decade extremes (2015-2024): 112°F (44°C) high · 38°F (3°C) low
- Wettest month: July (15 rainy days) · Sunniest: December (13.4 h sun/day)
- Climate type: Mediterranean
- Annual swing: 11°C between the average warmest and coolest month · day to night: 9°C
- Months averaging 30°C or hotter: 1
- Average humidity: 65%
Temperatures through the year
August sits at the other end of the year: 64°F (18°C) by day, 50°F (10°C) at night. At its warmest, in February, Perth runs to 86°F (30°C) in the afternoon and back to 67°F (19°C) by dawn. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 112°F (44°C) and the lowest daily minimum 38°F (3°C). December is the brightest month at 13.4 hours of sun a day, against an annual average of 10.8 - sunnier than 91% of the 3496 cities in our dataset.
Rain, sun and snow
Five of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is September through November. July is the wettest month at 4.6 inches (117 mm) over 15 days; December is the driest. Relative humidity averages 65% across the year, drier than about 79% of the cities we track.
How Perth compares
- Perth sits close to the middle of our dataset on most measures: 65°F (19°C) as an annual average, 25.3 inches (642 mm) of precipitation and 10.8 hours of sun a day.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 86° | 66° | 2 | 0.9 in | 12.8 h/day | 14.0 h | 5% | 53% |
| February | 86° | 67° | 2 | 0.8 in | 12.3 h/day | 13.3 h | 7% | 56% |
| March | 83° | 65° | 5 | 1.6 in | 10.9 h/day | 12.4 h | 15% | 60% |
| April | 76° | 59° | 6 | 1.6 in | 10.0 h/day | 11.3 h | 19% | 65% |
| May | 70° | 54° | 8 | 3.1 in | 9.0 h/day | 10.5 h | 25% | 69% |
| June | 65° | 51° | 12 | 4.1 in | 8.5 h/day | 10.1 h | 41% | 75% |
| July | 63° | 51° | 15 | 4.6 in | 8.4 h/day | 10.2 h | 49% | 76% |
| August | 64° | 50° | 13 | 4.2 in | 9.5 h/day | 11.0 h | 42% | 75% |
| September | 67° | 51° | 7 | 1.7 in | 10.8 h/day | 11.9 h | 25% | 72% |
| October | 71° | 55° | 6 | 1.5 in | 11.4 h/day | 12.9 h | 21% | 68% |
| November | 78° | 59° | 4 | 0.9 in | 12.9 h/day | 13.8 h | 12% | 61% |
| December | 83° | 64° | 2 | 0.3 in | 13.4 h/day | 14.2 h | 6% | 54% |
Perth month by month
Average high and low for each month, with the bar showing where it sits in Perth's year (left is the coldest night, right is the warmest afternoon).
January
- Rain
- 2 days
- Sunshine
- 12.8 h
- Daylight
- 14.0 h
February
- Rain
- 2 days
- Sunshine
- 12.3 h
- Daylight
- 13.3 h
March
- Rain
- 5 days
- Sunshine
- 10.9 h
- Daylight
- 12.4 h
April
- Rain
- 6 days
- Sunshine
- 10.0 h
- Daylight
- 11.3 h
May
- Rain
- 8 days
- Sunshine
- 9.0 h
- Daylight
- 10.5 h
June
- Rain
- 12 days
- Sunshine
- 8.5 h
- Daylight
- 10.1 h
July
- Rain
- 15 days
- Sunshine
- 8.4 h
- Daylight
- 10.2 h
August
- Rain
- 13 days
- Sunshine
- 9.5 h
- Daylight
- 11.0 h
September
- Rain
- 7 days
- Sunshine
- 10.8 h
- Daylight
- 11.9 h
October
- Rain
- 6 days
- Sunshine
- 11.4 h
- Daylight
- 12.9 h
November
- Rain
- 4 days
- Sunshine
- 12.9 h
- Daylight
- 13.8 h
December
- Rain
- 2 days
- Sunshine
- 13.4 h
- Daylight
- 14.2 h
Warmer places to go, by month: January · February · March · April · May · June · July · August · September · October · November · December
Seasons in Perth
Spring (September through November)
Spring settles into easy warmth here - highs near 72°F (22°C), nights near 55°F (13°C), and rain comes on about 18 days over the three months. Daylight is generous - around 11.7 hours of sun a day.
Summer (December through February)
Summer runs hot here - highs near 85°F (30°C), nights near 65°F (19°C), and precipitation is sparse, near 2.1 inches (53 mm) for the season. Daylight is generous - around 12.8 hours of sun a day.
Fall (March through May)
Through fall, Perth is pleasantly warm: 76°F (25°C) by day, 59°F (15°C) after dark, and expect showers on roughly 18 days across the season.
Winter (June through August)
Through winter, Perth stays on the cool side of mild: 64°F (18°C) by day, 51°F (10°C) after dark, and rain falls on around 41 of the 90 days.
Climate questions, answered
Is Perth hot in summer?
What should I pack for Perth?
Is Perth humid?
How sunny is Perth?
How warm is Perth on average?
Is Perth cold in winter?
Best time to visit Perth
The best time to visit Perth is generally March to May and September to November, when the dry season is running but the afternoons are still bearable. Daytime temperatures in that window sit near 74°F (23°C), with rain on about 6 days a month. For the same question asked the other way round, see where else is warm in March.
Pack for Perth with light clothing for the warm months and rain gear if you travel around July. Note the gap between afternoon and night: February pairs 86°F (30°C) with 67°F (19°C).
Perth temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need the precipitation in other units? The mm-to-inches rainfall converter handles it.