Basel-City (Basel)
September
Weather in Basel-City for September 2025
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 26.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.9 °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.
Is September a good time to visit Basel-City? check out the best time to travel to Basel-City page.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
6
Dry days
24
Rainy days
0
Snow days
22°/11°
Temperatures
11 km/h
Avg max wind
75 %
Avg humidity
Basel-City in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  26° | 2  27° | 3  26° | 4 26° | 5  27° | 6 27° | 7 28° |
| 8 26° | 9 24° | 10  24° | 11 23° | 12 24° | 13 22° | 14 21° |
| 15  21° | 16 19° | 17  20° | 18 20° | 19 18° | 20 20° | 21 21° |
| 22 19° | 23 19° | 24 20° | 25 21° | 26 19° | 27 19° | 28 17° |
| 29 18° | 30 18° |
You can click on date
Access Basel-City weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Basel-City
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Cloudy | 26° /12° | 0.5 mm | 6 | |
| 2 Sept. | Sunny | 27° /12° | 0.6 mm | 6 | |
| 3 Sept. | Overcast | 26° /13° | 2.4 mm | 6 | |
| 4 Sept. | Sunny | 26° /13° | 1 mm | 6 | |
| 5 Sept. | Patchy rain possible | 27° /13° | 1.1 mm | 6 | |
| 6 Sept. | Sunny | 27° /13° | 1 mm | 6 | |
| 7 Sept. | Sunny | 28° /14° | 1.1 mm | 7 | |
| 8 Sept. | Sunny | 26° /14° | 3.3 mm | 6 | |
| 9 Sept. | Patchy rain possible | 24° /14° | 2.1 mm | 6 | |
| 10 Sept. | Heavy rain at times | 24° /13° | 2.5 mm | 6 | |
| 11 Sept. | Overcast | 23° /12° | 4.5 mm | 6 | |
| 12 Sept. | Sunny | 24° /11° | 0.9 mm | 6 | |
| 13 Sept. | Sunny | 22° /11° | 1 mm | 6 | |
| 14 Sept. | Cloudy | 21° /12° | 3.2 mm | 5 | |
| 15 Sept. | Moderate or heavy rain shower | 21° /11° | 5 mm | 6 | |
| 16 Sept. | Moderate rain at times | 19° /11° | 2.1 mm | 5 | |
| 17 Sept. | Partly cloudy | 20° /11° | 1.1 mm | 5 | |
| 18 Sept. | Cloudy | 20° /10° | 2.2 mm | 5 | |
| 19 Sept. | Moderate or heavy rain shower | 18° /10° | 3.5 mm | 5 | |
| 20 Sept. | Patchy rain possible | 20° /9° | 0 mm | 5 | |
| 21 Sept. | Sunny | 21° /9° | 1.5 mm | 5 | |
| 22 Sept. | Sunny | 19° /9° | 3.7 mm | 5 | |
| 23 Sept. | Sunny | 19° /8° | 2.2 mm | 5 | |
| 24 Sept. | Sunny | 20° /9° | 1.4 mm | 5 | |
| 25 Sept. | Overcast | 21° /8° | 0.5 mm | 5 | |
| 26 Sept. | Moderate or heavy rain shower | 19° /10° | 13.8 mm | 5 | |
| 27 Sept. | Overcast | 19° /9° | 4.1 mm | 5 | |
| 28 Sept. | Cloudy | 17° /9° | 5.3 mm | 4 | |
| 29 Sept. | Moderate rain at times | 18° /8° | 3.2 mm | 5 | |
| 30 Sept. | Overcast | 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.
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.
What to pack to Basel-City in September?
As you prepare for your trip to Basel-City in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Basel-City, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
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
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.