Perth weather in May
May in Perth: nice, a little rain, with clean air — an excellent time to visit.
#8 of 12 months in Perth · #181 of 604 destinations to visit in May · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Perth climate normals — May
| Daytime high | 21°C / 70°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 53°F | |
| Feels like (high) | 19°C / 66°F | |
| Rainfall | 57 mm / 2.3 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 68% | 💧 humid |
| Dew point | 9°C / 49°F | |
| Sunshine | 8.7 h/day | |
| Daylight | 10.5 h | |
| Wind | 23 km/h / 14 mph | |
| Air quality (US AQI) | 25 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Perth in May — FAQ
- Is May a good time to visit Perth?
- May in Perth: nice, a little rain, with clean air — an excellent time to visit. It ranks #8 of 12 months for Perth on SeasonMap's comfort score (86/100).
- What is the weather like in Perth in May?
- In May, Perth averages a daily high of 20.9°C and a low of 11.7°C, with about 57.3 mm of rain over roughly 8 rainy days.
- What is the air quality in Perth in May?
- Perth has a mean US Air Quality Index of about 25 in May.