Basel-Stadt (Basel)
September
Weather in Basel-Stadt for September 2025
Your guide to Basel-Stadt weather in September - trends and predictions
Until now, September 2025 in Basel-Stadt is cooler than usual, with temperatures averaging 20.2 °C, this is -3.9 °C below the typical seasonal average.
The forecast for the next days in Basel-Stadt predicts a temperature of 17.2 °C, which is cooler than the historical average.
In general, the average temperature in Basel-Stadt at the beginning of September is 25.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13 °C by the end of September.
Basel-Stadt experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 75.2 mm.
Temperatures
Rain 🌧️
6
Dry days
24
Rainy days
0
Snow days
22°/11°
Temperatures
11 km/h
Avg max wind
75 %
Avg humidity
Basel-Stadt Weather September
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Temperatures trend during September in Basel-Stadt
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September weather in Basel-Stadt day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Cloudy | 24° /12° | 2.1 mm | 6 | |
| 2 Sept. |  Sunny | 25° /12° | 1.8 mm | 6 | |
| 3 Sept. |  Overcast | 26° /13° | 1.9 mm | 6 | |
| 4 Sept. |  Light rain shower | 25° /13° | 5.9 mm | 6 | |
| 5 Sept. | Patchy rain possible | 25° /12° | 1.7 mm | 6 | |
| 6 Sept. | Sunny | 26° /12° | 0.8 mm | 6 | |
| 7 Sept. | Sunny | 28° /13° | 0.9 mm | 7 | |
| 8 Sept. | Sunny | 25° /14° | 2.7 mm | 6 | |
| 9 Sept. | Patchy rain possible | 23° /13° | 7.6 mm | 5 | |
| 10 Sept. |  Heavy rain at times | 23° /12° | 2.4 mm | 5 | |
| 11 Sept. | Patchy rain possible | 22° /12° | 3.7 mm | 5 | |
| 12 Sept. | Sunny | 23° /11° | 0.8 mm | 5 | |
| 13 Sept. | Light rain shower | 22° /11° | 2 mm | 5 | |
| 14 Sept. | Patchy rain possible | 21° /12° | 3.6 mm | 5 | |
| 15 Sept. |  Moderate or heavy rain shower | 22° /11° | 4.1 mm | 5 | |
| 16 Sept. | Patchy rain possible | 18° /11° | 0.1 mm | 0.9 | |
| 17 Sept. |  Partly cloudy | 18° /11° | 0 mm | 0.7 | |
| 18 Sept. | Sunny | 26° /12° | 0 mm | 1.3 | |
| 19 Sept. | Sunny | 29° /14° | 0 mm | 1.3 | |
| 20 Sept. | Patchy rain possible | 30° /17° | 0.4 mm | 1.3 | |
| 21 Sept. | Patchy rain possible | 24° /16° | 1.1 mm | 4 | |
| 22 Sept. |  Moderate rain | 12° /10° | 11.8 mm | 3 | |
| 23 Sept. | Moderate rain | 11° /10° | 10.4 mm | 3 | |
| 24 Sept. | Moderate rain | 10° /5° | 5.7 mm | 2 | |
| 25 Sept. | Patchy rain possible | 8° /5° | 1.4 mm | 2 | |
| 26 Sept. | Patchy rain possible | 10° /6° | 0.2 mm | 2 | |
| 27 Sept. |  Mist | 14° /5° | 0 mm | 2 | |
| 28 Sept. | Sunny | 15° /4° | 0 mm | 3 | |
| 29 Sept. | Sunny | 16° /5° | 0 mm | 3 | |
| 30 Sept. | Overcast | 18° /7° | 0.3 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Basel-Stadt in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Basel-Stadt forecast closer to your planned date for the most up-to-date weather information.
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Basel-Stadt in September - FAQ
What are the expected maximum and minimum temperatures in Basel-Stadt during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Basel-Stadt during September?
Moderate rainfall is anticipated in Basel-Stadt during September, with a total of 75.2 mm spread over approximately 24 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Basel-Stadt during September?
The average wind speed in Basel-Stadt during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Basel-Stadt
Explore the daily rainfall trends and prepare for Basel-Stadts September weather 💧
UV exposure in Basel-Stadt during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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