Perth weather in September
September in Perth: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Perth · #99 of 604 destinations to visit in September · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Perth climate normals — September
| Daytime high | 20°C / 68°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 53°F | |
| Feels like (high) | 18°C / 64°F | |
| Rainfall | 38 mm / 1.5 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 10°C / 50°F | |
| Sunshine | 10.4 h/day | |
| Daylight | 11.9 h | |
| Wind | 25 km/h / 16 mph | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Perth in September — FAQ
- Is September a good time to visit Perth?
- September in Perth: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Perth on SeasonMap's comfort score (89/100).
- What is the weather like in Perth in September?
- In September, Perth averages a daily high of 19.9°C and a low of 11.6°C, with about 38.1 mm of rain over roughly 7.8 rainy days.
- What is the air quality in Perth in September?
- Perth has a mean US Air Quality Index of about 34 in September.