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Weather in Basel for September 2025

Your guide to Basel weather in September - trends and predictions
  • 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.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
24
Dry days
Average rainy days
6
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/13°
Temperatures
Average wind speed
10 km/h
Avg max wind
Average humidity
66 %
Avg humidity

Basel in September average weather

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Temperatures trend during September in Basel

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Cloudy
Cloudy
28° /15° 1.1 mm 7
2 Sept. Sunny
Sunny
28° /15° 0.5 mm 7
3 Sept. Sunny
Sunny
27° /15° 3.9 mm 7
4 Sept. Overcast
Overcast
26° /14° 1.9 mm 6
5 Sept. Sunny
Sunny
26° /13° 2.1 mm 6
6 Sept. Sunny
Sunny
26° /12° 0 mm 6
7 Sept. Sunny
Sunny
29° /14° 0 mm 8
8 Sept. Sunny
Sunny
27° /15° 1.5 mm 7
9 Sept. Sunny
Sunny
25° /14° 3.2 mm 6
10 Sept. Sunny
Sunny
26° /13° 0.1 mm 6
11 Sept. Sunny
Sunny
24° /13° 8.9 mm 6
12 Sept. Thundery outbreaks possible
Thundery outbreaks possible
22° /11° 1.7 mm 5
13 Sept. Mist
Mist
17° /10° 1.3 mm 4
14 Sept. Fog
Fog
17° /10° 0.2 mm 4
15 Sept. Partly cloudy
Partly cloudy
21° /8° 0 mm 6
16 Sept. Light rain shower
Light rain shower
19° /10° 1.3 mm 5
17 Sept. Sunny
Sunny
22° /13° 0.8 mm 6
18 Sept. Light rain shower
Light rain shower
20° /11° 4.4 mm 5
19 Sept. Light drizzle
Light drizzle
20° /12° 0.6 mm 5
20 Sept. Sunny
Sunny
24° /10° 0 mm 6
21 Sept. Light rain
Light rain
24° /12° 3 mm 6
22 Sept. Patchy light rain with thunder
Patchy light rain with thunder
20° /12° 7.4 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
16° /10° 3.8 mm 4
24 Sept. Sunny
Sunny
20° /8° 0.1 mm 5
25 Sept. Sunny
Sunny
21° /7° 0.3 mm 6
26 Sept. Sunny
Sunny
20° /10° 23.8 mm 5
27 Sept. Overcast
Overcast
20° /9° 2.2 mm 5
28 Sept. Partly cloudy
Partly cloudy
19° /9° 3.9 mm 5
29 Sept. Partly cloudy
Partly cloudy
21° /8° 0 mm 6
30 Sept. Sunny
Sunny
21° /9° 0.6 mm 5
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Important Notice
Our weather forecast for Basel 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 forecast closer to your planned date for the most up-to-date weather information.

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

Is September a good time to visit Basel?
Yes, September is a good time to traveling to Basel, read more about the best time to visit Basel.
What are the expected maximum and minimum temperatures in Basel 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 during September?
In September, Basel 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 during September?
The average wind speed in Basel during September is 10 km/h, suggesting breezy to windy conditions, depending on your activities.

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

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Location coordinates Where is Basel?

Get accurate weather forecasts for Basel, located at latitude 47.558 and longitude 7.573. Stay updated with localized weather information tailored for Basel.

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