Perth weather in May
In May, Perth has an average high of 21 °C69 °F and an average low of 16 °C60 °F, with about 84 mm3.3 in of precipitation. It is the 7th warmest month of the year and ranks 4th for precipitation.
How May compares with other months
Compared with April, May is 1.9 °C3.5 °F cooler on average and wetter by 50 mm2.0 in. Compared with June, May is 1.7 °C3.1 °F warmer on average and drier by 29 mm1.2 in. Daylight lasts about 10.5 hours around the middle of the month. Average relative humidity is 69% and the average cloud amount 54%.
Is May a good time to visit Perth?
Yes — May is one of the most comfortable months to visit Perth by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in May
For Perth in May, pack light layers — T-shirts plus a light sweater or jacket.
May in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Perth | 2169 | 1660 | 843.3 |
| Mandurah | 2169 | 1660 | 973.8 |
| Augusta | 1966 | 1762 | 883.5 |
| Roebourne | 3189 | 1864 | 230.9 |
| Marble Bar | 3188 | 1661 | 160.6 |
Nearby places that are more than 1 °C1.8 °F warmer in May: Roebourne and Marble Bar.
Other months in Perth
- January26 °C79 °F / 19 °C66 °F
- February27 °C80 °F / 20 °C68 °F
- March26 °C78 °F / 19 °C66 °F
- April23 °C73 °F / 17 °C63 °F
- May21 °C69 °F / 16 °C60 °F
- June19 °C66 °F / 14 °C58 °F
- July18 °C64 °F / 14 °C56 °F
- August18 °C64 °F / 13 °C56 °F
- September18 °C64 °F / 13 °C56 °F
- October20 °C68 °F / 14 °C58 °F
- November22 °C72 °F / 16 °C61 °F
- December24 °C76 °F / 18 °C64 °F
Frequently asked questions
How warm is Perth in May?
In May the average high in Perth is 21 °C (69 °F) and the average low is 16 °C (60 °F).
Does it rain a lot in Perth in May?
On average about 84 mm (3.3 in) of precipitation falls in May; it ranks 4th of the 12 months.
Is May the warmest month in Perth?
No. The warmest month in Perth is February, with an average high of 27 °C (80 °F). The coldest month is September, with an average low of 13 °C (56 °F).
How long is the day in Perth in May?
In the middle of May the day in Perth lasts about 10.5 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Perth in May?
The average relative humidity in May is about 69%. This is a long-term average for the whole day.
How cloudy is Perth in May?
On average about 54% of the sky is covered by cloud in May. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.