Sissach Weather in September
What's the weather like in Sissach (Basel-Landschaft) in September 2025?
The climate in Sissach during September can be summarized as mild and a little damp.
September is in the fall / autumn in Sissach and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 18°C (65°F), whilst at night 9°C (49°F) is normal.
| Daytime temperature | 18.2°C 64.8°F |
|---|---|
| Nightly temperature | 9.2°C 48.6°F |
| Average temperature | 13.7°C 56.7°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 81 mm 3.2 ins |
| Rainy days | 13 days |
| Sea temperature | 20.5°C 68.9°F |
| Humidity | 78% |
| Windspeed | 6.8kph 4 mph |
On average September is the 6th wettest month of the year in Sissach with around 81mm 3.2 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 13 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 Sissach
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 Sissach in September 2025.
Other monthly averages
Best places to visit in September
Sissach weather stats
| Hottest month: | July | 21.9°C 71.4°F |
|---|---|---|
| Driest month: | October | 59mm 2.3ins |
| Sunniest month: | July | 7.9hrs |
| Coldest month: | January | 1.5°C 34.7°F |
| Wettest month: | August | 130mm 5.1ins |
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