Perth, Australia Weather
Perth hourly forecast: next 24 hours
Today's high of 78°F (26°C) is about 11°F (6°C) above the typical September high of 67°F (19°C).
Current conditions in detail
Perth weather tomorrow (Thursday, September 17)
Tomorrow in Perth looks sunny, with a high of 73° and an overnight low of 64°. Rain is unlikely (9% chance). Winds top out near 18 mph, and the UV index reaches 8 (very high).
Perth 14-day forecast
About the weather in 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).
Perth weather: 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.
Season by season
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.
Average temperatures in Perth by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 86° | 66° | 2 | 0.9 in | 12.8 h/day | 53% |
| February | 86° | 67° | 2 | 0.8 in | 12.3 h/day | 56% |
| March | 83° | 65° | 5 | 1.6 in | 10.9 h/day | 60% |
| April | 76° | 59° | 6 | 1.6 in | 10.0 h/day | 65% |
| May | 70° | 54° | 8 | 3.1 in | 9.0 h/day | 69% |
| June | 65° | 51° | 12 | 4.1 in | 8.5 h/day | 75% |
| July | 63° | 51° | 15 | 4.6 in | 8.4 h/day | 76% |
| August | 64° | 50° | 13 | 4.2 in | 9.5 h/day | 75% |
| September | 67° | 51° | 7 | 1.7 in | 10.8 h/day | 72% |
| October | 71° | 55° | 6 | 1.5 in | 11.4 h/day | 68% |
| November | 78° | 59° | 4 | 0.9 in | 12.9 h/day | 61% |
| December | 83° | 64° | 2 | 0.3 in | 13.4 h/day | 54% |