Slemmestad Weather in September
What's the weather like in Slemmestad (Buskerud county) in September 2025?
The climate in Slemmestad during September can be summarized as mild and a little damp.
September is in the fall / autumn in Slemmestad and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 14°C (58°F), whilst at night 7°C (44°F) is normal.
| Daytime temperature | 14.3°C 57.7°F |
|---|---|
| Nightly temperature | 6.7°C 44.1°F |
| Average temperature | 10.5°C 50.9°F |
| Daily sunshine | 5 hrs |
| Avg rainfall | 97 mm 3.8 ins |
| Rainy days | 16 days |
| Sea temperature | 15.2°C 59.3°F |
| Humidity | 77% |
| Windspeed | 16.6kph 10 mph |
On average September is the wettest month of the year in Slemmestad with around 97mm 3.8 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 16 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 Slemmestad
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 Slemmestad in September 2025.
Other monthly averages
Best places to visit in September
Slemmestad weather stats
| Hottest month: | July | 20.4°C 68.7°F |
|---|---|---|
| Driest month: | February | 40mm 1.6ins |
| Sunniest month: | June | 9.5hrs |
| Coldest month: | January | -2.5°C 27.5°F |
| Wettest month: | September | 97mm 3.8ins |
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