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 27.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.3 °C by the end of September.
Basel-City sees moderate rainfall in September, averaging 6 rainy days.
Is September a good time to visit Basel-City? check out the best time to travel to Basel-City page.
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24
Dry days
6
Rainy days
0
Snow days
26°/13°
Temperatures
10 km/h
Avg max wind
66 %
Avg humidity
Basel-City in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2  28° | 3 27° | 4  26° | 5 26° | 6 26° | 7 29° |
| 8 27° | 9 25° | 10 26° | 11 24° | 12  22° | 13  17° | 14 17° |
| 15  21° | 16  19° | 17 22° | 18 20° | 19  20° | 20 24° | 21 24° |
| 22  20° | 23 16° | 24 20° | 25 21° | 26 20° | 27 20° | 28 19° |
| 29 21° | 30 21° |
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Temperatures trend during September in Basel-City
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Cloudy | 28° /15° | 1.1 mm | 7 | |
| 2 Sept. | Sunny | 28° /15° | 0.5 mm | 7 | |
| 3 Sept. | Sunny | 27° /15° | 3.9 mm | 7 | |
| 4 Sept. | Overcast | 26° /14° | 1.9 mm | 6 | |
| 5 Sept. | Sunny | 26° /13° | 2.1 mm | 6 | |
| 6 Sept. | Sunny | 26° /12° | 0 mm | 6 | |
| 7 Sept. | Sunny | 29° /14° | 0 mm | 8 | |
| 8 Sept. | Sunny | 27° /15° | 1.5 mm | 7 | |
| 9 Sept. | Sunny | 25° /14° | 3.2 mm | 6 | |
| 10 Sept. | Sunny | 26° /13° | 0.1 mm | 6 | |
| 11 Sept. | Sunny | 24° /13° | 8.9 mm | 6 | |
| 12 Sept. | Thundery outbreaks possible | 22° /11° | 1.7 mm | 5 | |
| 13 Sept. | Mist | 17° /10° | 1.3 mm | 4 | |
| 14 Sept. | Fog | 17° /10° | 0.2 mm | 4 | |
| 15 Sept. | Partly cloudy | 21° /8° | 0 mm | 6 | |
| 16 Sept. | Light rain shower | 19° /10° | 1.3 mm | 5 | |
| 17 Sept. | Sunny | 22° /13° | 0.8 mm | 6 | |
| 18 Sept. | Light rain shower | 20° /11° | 4.4 mm | 5 | |
| 19 Sept. | Light drizzle | 20° /12° | 0.6 mm | 5 | |
| 20 Sept. | Sunny | 24° /10° | 0 mm | 6 | |
| 21 Sept. | Light rain | 24° /12° | 3 mm | 6 | |
| 22 Sept. | Patchy light rain with thunder | 20° /12° | 7.4 mm | 5 | |
| 23 Sept. | Patchy rain possible | 16° /10° | 3.8 mm | 4 | |
| 24 Sept. | Sunny | 20° /8° | 0.1 mm | 5 | |
| 25 Sept. | Sunny | 21° /7° | 0.3 mm | 6 | |
| 26 Sept. | Sunny | 20° /10° | 23.8 mm | 5 | |
| 27 Sept. | Overcast | 20° /9° | 2.2 mm | 5 | |
| 28 Sept. | Partly cloudy | 19° /9° | 3.9 mm | 5 | |
| 29 Sept. | Partly cloudy | 21° /8° | 0 mm | 6 | |
| 30 Sept. | Sunny | 21° /9° | 0.6 mm | 5 | |
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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 26° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Basel-City during September?
In September, Basel-City can expect light to moderate rainfall, totaling 32.9 mm across approximately 6 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Basel-City during September?
The average wind speed in Basel-City during September is 10 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
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- 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
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
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 ☀️
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