Trollhättan Weather in September
What's the weather like in Trollhättan (Västra Götaland) in September 2025?
The climate in Trollhättan during September can be summarized as mild and a little damp.
September is in the fall / autumn in Trollhättan and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 16°C (60°F), whilst at night 8°C (46°F) is normal.
| Daytime temperature | 15.5°C 59.8°F |
|---|---|
| Nightly temperature | 7.8°C 46°F |
| Average temperature | 11.6°C 52.9°F |
| Daily sunshine | 5 hrs |
| Avg rainfall | 84 mm 3.3 ins |
| Rainy days | 14 days |
| Sea temperature | 15°C 59.1°F |
| Humidity | 81% |
| Windspeed | 18.4kph 11 mph |
On average September is the 3rd wettest month of the year in Trollhättan with around 84mm 3.3 inches of rain making it a a little damp 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 5 hours of sunshine per day.
September temperatures in Trollhättan
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 Trollhättan in September 2025.
Other monthly averages
Best places to visit in September
Trollhättan weather stats
| Hottest month: | July | 20.6°C 69.1°F |
|---|---|---|
| Driest month: | February | 42mm 1.7ins |
| Sunniest month: | June | 9.5hrs |
| Coldest month: | January | -0.4°C 31.3°F |
| Wettest month: | November | 87mm 3.4ins |
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