Perth Weather in September
What's the weather like in Perth (Ontario) in September 2025?
The climate in Perth during September can be summarized as mild and a little damp.
September is in the fall / autumn in Perth and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 20°C (68°F), whilst at night 9°C (48°F) is normal.
| Daytime temperature | 19.9°C 67.7°F |
|---|---|
| Nightly temperature | 8.8°C 47.8°F |
| Average temperature | 14.3°C 57.7°F |
| Daily sunshine | 6.2 hrs |
| Avg rainfall | 81 mm 3.2 ins |
| Rainy days | 9 days |
| Sea temperature | 18.5°C 65.4°F |
| Humidity | 77% |
| Windspeed | 12.6kph 8 mph |
On average September is the wettest month of the year in Perth with around 81mm 3.2 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.2 hours of sunshine per day.
September temperatures in Perth
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Perth in September 2025.
Other monthly averages
Best places to visit in September
Perth weather stats
| Hottest month: | July | 26.3°C 79.3°F |
|---|---|---|
| Driest month: | January | 57mm 2.2ins |
| Sunniest month: | July | 9.8hrs |
| Coldest month: | January | -5.7°C 21.7°F |
| Wettest month: | September | 81mm 3.2ins |
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