Basel-Stadt (Basel)
September
Weather in Basel-Stadt for September 2026
Your guide to Basel-Stadt weather in September - trends and predictions
So far, September 2026 in Basel-Stadt is slightly warmer than the historical average by 0.9 °C.
An exceptional deviation from the historical average is forecasted for next days of September 2026 in Basel-Stadt with the forecasted temperature being 21.3 °C, much lower than usual.
In general, the average temperature in Basel-Stadt at the beginning of September is 25.7 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 23.7 °C by the end of September.
The climate of Basel-Stadt in September is notably wet, with an average of 12 rainy days, and a total of 89.4 mm of precipitation.
Temperatures
Rain 🌧️
18
Dry days
12
Rainy days
0
Snow days
21°/11°
Temperatures
11 km/h
Avg max wind
76 %
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° | 1.8 mm | 6 | |
| 2 Sept. |  Sunny | 25° /12° | 1.5 mm | 6 | |
| 3 Sept. | Sunny | 26° /13° | 1.6 mm | 6 | |
| 4 Sept. | Sunny | 26° /14° | 4.9 mm | 6 | |
| 5 Sept. |  Patchy rain possible | 25° /13° | 2.1 mm | 5 | |
| 6 Sept. | Sunny | 26° /12° | 0.6 mm | 6 | |
| 7 Sept. | Sunny | 28° /14° | 0.8 mm | 6 | |
| 8 Sept. | Sunny | 26° /15° | 2.6 mm | 6 | |
| 9 Sept. | Patchy rain possible | 22° /13° | 6.7 mm | 5 | |
| 10 Sept. |  Heavy rain at times | 22° /12° | 2 mm | 5 | |
| 11 Sept. |  Overcast | 22° /12° | 3.1 mm | 5 | |
| 12 Sept. | Sunny | 23° /11° | 0.7 mm | 5 | |
| 13 Sept. | Light rain shower | 23° /11° | 2.3 mm | 5 | |
| 14 Sept. | Patchy rain possible | 21° /12° | 3.3 mm | 5 | |
| 15 Sept. |  Moderate or heavy rain shower | 23° /12° | 3.5 mm | 5 | |
| 16 Sept. | Moderate rain at times | 19° /11° | 1.6 mm | 4 | |
| 17 Sept. |  Partly cloudy | 20° /10° | 0.8 mm | 5 | |
| 18 Sept. | Overcast | 21° /10° | 1.5 mm | 5 | |
| 19 Sept. | Sunny | 21° /10° | 2.4 mm | 5 | |
| 20 Sept. | Patchy rain possible | 22° /10° | 0.6 mm | 4 | |
| 21 Sept. | Sunny | 21° /10° | 5.1 mm | 5 | |
| 22 Sept. | Sunny | 18° /9° | 3.5 mm | 4 | |
| 23 Sept. | Sunny | 18° /8° | 3.4 mm | 5 | |
| 24 Sept. | Sunny | 19° /9° | 1.5 mm | 4 | |
| 25 Sept. | Overcast | 20° /8° | 0.3 mm | 4 | |
| 26 Sept. | Sunny | 19° /10° | 10.1 mm | 4 | |
| 27 Sept. | Sunny | 28° /14° | 0 mm | 4.2 | |
| 28 Sept. | Overcast | 27° /17° | 0 mm | 3.8 | |
| 29 Sept. | Overcast | 26° /17° | 0 mm | 3.5 | |
| 30 Sept. | Sunny | 27° /16° | 0 mm | 3.4 | |
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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.
Change Month
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 21° 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 89.4 mm spread over approximately 12 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 💧
Typically, Basel-Stadt has 12 rainy days in September with a total of 89.4 mm of rainfall.
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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Where is Basel-Stadt?Get accurate weather forecasts for Basel-Stadt, located at latitude 47.558 and longitude 7.573. Stay updated with localized weather information tailored for Basel-Stadt.
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