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Switzerland weather

Weather in Biel/Bienne for September 2025

Your guide to Biel/Bienne weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Biel/Bienne is cooler than usual, with temperatures averaging 18.8 °C, this is -3.3 °C below the typical seasonal average.

  • The forecast for the next days in Biel/Bienne predicts temperatures to be around 21 °C, close to the historical average.

  • In general, the average temperature in Biel/Bienne at the beginning of September is 23.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.6 °C by the end of September.

    • Rain 🌧️

  • Biel/Bienne in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 112.1 mm.

Average dry days
12
Dry days
Average rainy days
18
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/9°
Temperatures
Average wind speed
10 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Biel/Bienne Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Partly cloudy
23°
2
Sunny
24°
3
Partly cloudy
24°
4
Mist
23°
5
Light rain shower
22°
6
Mist
24°
7
Sunny
27°
8
Sunny
24°
9
Sunny
19°
10
Sunny
22°
11
Partly cloudy
20°
12
Thundery outbreaks possible
20°
13
Light rain shower
16°
14
Moderate rain
15°
15
Patchy rain possible
24°
16
Partly cloudy
16°
17
Partly cloudy
20°
18
Sunny
24°
19
Sunny
25°
20
Sunny
25°
21
Sunny
21°
22
Patchy rain possible
21°
23
Patchy rain possible
17°
24
Partly cloudy
21°
25
Patchy rain possible
21°
26
Moderate rain
15°
27
Partly cloudy
19°
28
Overcast
16°
29
Sunny
19°
30
Sunny
19°

Temperatures trend during September in Biel/Bienne

See the weather trend as well as the moving average line

September weather in Biel/Bienne day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 23° /12° 7.4 mm 5
2 Sept. Sunny
Sunny
 24° /11° 4.7 mm 6
3 Sept. Partly cloudy
Partly cloudy
 24° /12° 3.6 mm 6
4 Sept. Mist
Mist
 23° /13° 9.7 mm 5
5 Sept. Light rain shower
Light rain shower
 22° /11° 4.4 mm 5
6 Sept. Mist
Mist
 24° /10° 0 mm 6
7 Sept. Sunny
Sunny
 27° /11° 0 mm 6
8 Sept. Sunny
Sunny
 24° /13° 3.4 mm 5
9 Sept. Sunny
Sunny
 19° /11° 11.7 mm 5
10 Sept. Sunny
Sunny
 22° /10° 1.5 mm 5
11 Sept. Partly cloudy
Partly cloudy
 20° /11° 6.6 mm 5
12 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 20° /9° 1.5 mm 4
13 Sept. Light rain shower
Light rain shower
 16° /8° 4.7 mm 4
14 Sept. Moderate rain
Moderate rain
 15° /7° 3.8 mm 4
15 Sept. Patchy rain possible
Patchy rain possible
 24° /12° 1.9 mm 1.3
16 Sept. Partly cloudy
Partly cloudy
 16° /9° 0 mm 1
17 Sept. Partly cloudy
Partly cloudy
 20° /9° 0 mm 0.7
18 Sept. Sunny
Sunny
 24° /12° 0 mm 1.4
19 Sept. Sunny
Sunny
 25° /11° 0 mm 4
20 Sept. Sunny
Sunny
 25° /11° 0 mm 5
21 Sept. Sunny
Sunny
 21° /13° 0 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 21° /15° 1.3 mm 4
23 Sept. Patchy rain possible
Patchy rain possible
 17° /13° 2.9 mm 4
24 Sept. Partly cloudy
Partly cloudy
 21° /12° 0 mm 5
25 Sept. Patchy rain possible
Patchy rain possible
 21° /11° 1.8 mm 3
26 Sept. Moderate rain
Moderate rain
 15° /7° 5.5 mm 3
27 Sept. Partly cloudy
Partly cloudy
 19° /6° 0 mm 4
28 Sept. Overcast
Overcast
 16° /5° 2.8 mm 4
29 Sept. Sunny
Sunny
 19° /6° 0 mm 5
30 Sept. Sunny
Sunny
 19° /8° 0.6 mm 5
Next
Important Notice
Our weather forecast for Biel/Bienne 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 Biel/Bienne forecast closer to your planned date for the most up-to-date weather information.
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Biel/Bienne in September - FAQ

What are the expected maximum and minimum temperatures in Biel/Bienne during September?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Biel/Bienne during September?
Significant rainfall exceeding 112.1 mm is expected in Biel/Bienne during September, occurring over more than 18 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Biel/Bienne during September?
The average wind speed in Biel/Bienne during September is 10 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Biel/Bienne

Explore the daily rainfall trends and prepare for Biel/Biennes September weather 💧

UV exposure in Biel/Bienne during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Biel/Bienne?

Get accurate weather forecasts for Biel/Bienne, located at latitude 47.137 and longitude 7.246. Stay updated with localized weather information tailored for Biel/Bienne.

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