Oyonnax Weather in September
What's the weather like in Oyonnax (Rhône-Alpes) in September 2025?
The climate in Oyonnax during September can be summarized as mild and a little damp.
September is in the fall / autumn in Oyonnax and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 20°C (68°F), whilst at night 9°C (49°F) is normal.
| Daytime temperature | 19.8°C 67.6°F |
|---|---|
| Nightly temperature | 9.4°C 48.9°F |
| Average temperature | 14.6°C 58.3°F |
| Daily sunshine | 7 hrs |
| Avg rainfall | 91 mm 3.6 ins |
| Rainy days | 12 days |
| Sea temperature | 20.5°C 68.9°F |
| Humidity | 73% |
| Windspeed | 9.4kph 6 mph |
On average September is the 4th wettest month of the year in Oyonnax with around 91mm 3.6 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 7 hours of sunshine per day.
September temperatures in Oyonnax
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 Oyonnax in September 2025.
Other monthly averages
Best places to visit in September
Oyonnax weather stats
| Hottest month: | July | 23.6°C 74.5°F |
|---|---|---|
| Driest month: | July | 74mm 2.9ins |
| Sunniest month: | July | 9.4hrs |
| Coldest month: | January | 2.9°C 37.2°F |
| Wettest month: | May | 96mm 3.8ins |
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