Basel-City (Basel)
September
Weather in Basel-City for September 2026
Your guide to Basel-City weather in September - trends and predictions
In general, the average temperature in Basel-City at the beginning of September is 25.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18 °C by the end of September.
Basel-City 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-City Weather September
Move between months or click on a day
Temperatures trend during September in Basel-City
See the weather trend as well as the moving average line
September weather in Basel-City day by day
Click on a date for more information
| 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. | Moderate rain at times | 19° /11° | 1.6 mm | 4 | |
| 17 Sept. |  Partly cloudy | 20° /11° | 0.9 mm | 5 | |
| 18 Sept. | Cloudy | 21° /10° | 1.8 mm | 5 | |
| 19 Sept. | Sunny | 20° /10° | 2.8 mm | 5 | |
| 20 Sept. | Patchy rain possible | 21° /10° | 0.7 mm | 5 | |
| 21 Sept. | Sunny | 22° /9° | 6.1 mm | 5 | |
| 22 Sept. | Light rain shower | 18° /9° | 4.2 mm | 4 | |
| 23 Sept. | Sunny | 17° /8° | 4.1 mm | 5 | |
| 24 Sept. | Sunny | 18° /8° | 1.7 mm | 5 | |
| 25 Sept. | Overcast | 19° /8° | 0.4 mm | 5 | |
| 26 Sept. | Moderate or heavy rain shower | 18° /10° | 12.2 mm | 4 | |
| 27 Sept. | Overcast | 18° /9° | 3.8 mm | 4 | |
| 28 Sept. | Cloudy | 17° /8° | 4.2 mm | 4 | |
| 29 Sept. | Moderate rain at times | 18° /8° | 2.6 mm | 4 | |
| 30 Sept. | Patchy rain possible | 18° /7° | 0.3 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Basel-City 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-City forecast closer to your planned date for the most up-to-date weather information.
Change Month
Basel-City in September - FAQ
What are the expected maximum and minimum temperatures in Basel-City 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-City during September?
Moderate rainfall is anticipated in Basel-City 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-City during September?
The average wind speed in Basel-City during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Basel-City
Explore the daily rainfall trends and prepare for Basel-Citys September weather 💧
UV exposure in Basel-City during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Provinces in Basel-City
Select a province for an accurate weather forecast
Top locations in Basel-City
Select a location for an accurate weather forecast
More Locations Quick links
More Basel-City weather pages
You are here
Where is Basel-City?Get accurate weather forecasts for Basel-City, located at latitude 47.558 and longitude 7.573. Stay updated with localized weather information tailored for Basel-City.
Found a mistake?
We appreciate your attention to details. Tell us here.