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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.

  • 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-City in September average weather

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Temperatures trend during September in Basel-City

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-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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Location coordinates 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.

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