Weather in Basel for September 2025
In general, the average temperature in Basel 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 sees moderate rainfall in September, averaging 6 rainy days.
Is September a good time to visit Basel? check out the best time to travel to Basel page.
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Basel in September average weather
| 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
September weather day by day
| 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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Guide for Basel in September
In September, Basel, Switzerland experiences a transition from the lingering warmth of summer to the crisp coolness of autumn. At the beginning of the month, the weather in Basel is typically pleasant, with average temperatures around 18° and occasional sunny days.
However, as the month progresses, the temperatures gradually begin to drop. By the end of September, the city experiences cooler weather, with average temperatures around 14°.
The beginning of September in Basel often sees mild and comfortable conditions, making it an ideal time to explore the city's outdoor attractions and enjoy al fresco dining along the Rhine River. As the month progresses, the weather becomes cooler, and occasional rain showers become more frequent.
Visitors to Basel towards the end of September should be prepared for cooler temperatures and the possibility of rain, making it advisable to pack layers and a waterproof jacket.
Overall, September in Basel offers a mix of late summer warmth and early autumn coolness, providing a diverse experience for travelers.
Whether enjoying the last days of outdoor activities or embracing the onset of fall, visitors to Basel can appreciate the changing weather and the unique atmosphere it brings to the city.
Basel in September - FAQ
What to pack to Basel in September?
As you prepare for your trip to Basel 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, 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
UV exposure in Basel during September
Quick links
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