Brig Weather in September
What's the weather like in Brig (Valais) in September 2025?
The climate in Brig during September can be summarized as cool and wet.
September is in the fall / autumn in Brig and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 13°C (54°F), whilst at night 6°C (43°F) is normal.
| Daytime temperature | 12.5°C 54.4°F |
|---|---|
| Nightly temperature | 6°C 42.7°F |
| Average temperature | 9.2°C 48.6°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 121 mm 4.8 ins |
| Rainy days | 14 days |
| Sea temperature | 21.1°C 70.1°F |
| Humidity | 77% |
| Windspeed | 10.8kph 7 mph |
On average September is the 5th wettest month of the year in Brig with around 121mm 4.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 14 days, although this may vary considerably.
On the flip side this corresponds to an average of 6 hours of sunshine per day.
September temperatures in Brig
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 Brig in September 2025.
Other monthly averages
Best places to visit in September
Brig weather stats
| Hottest month: | July | 15.7°C 60.3°F |
|---|---|---|
| Driest month: | February | 88mm 3.5ins |
| Sunniest month: | July | 7.6hrs |
| Coldest month: | January | -1.6°C 29.1°F |
| Wettest month: | August | 156mm 6.1ins |
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