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Switzerland weather

Weather in Biel/Bienne for September 2026

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

    Temperatures

  • Until now, September 2026 in Biel/Bienne is slightly cooler than the historical average by 1 °C.

  • Expect cooler weather in the next days in Biel/Bienne with the forecast suggesting a temperature of 19.7 °C, lower than the historical average.

  • In general, the average temperature in Biel/Bienne at the beginning of September is 23.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.1 °C by the end of September.

    • Rain 🌧️

  • The climate of Biel/Bienne in September is notably wet, with an average of 14 rainy days, and a total of 128.8 mm of precipitation.

Average dry days
16
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/9°
Temperatures
Average wind speed
10 km/h
Avg max wind
Average humidity
80 %
Avg humidity

Biel/Bienne Weather September

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

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
 22° /12° 5.5 mm 6
2 Sept. Sunny
Sunny
 23° /11° 3.5 mm 5
3 Sept. Partly cloudy
Partly cloudy
 24° /12° 2.7 mm 6
4 Sept. Mist
Mist
 24° /13° 7.2 mm 6
5 Sept. Light rain shower
Light rain shower
 22° /12° 4.2 mm 5
6 Sept. Sunny
Sunny
 24° /11° 0 mm 6
7 Sept. Sunny
Sunny
 27° /12° 0.1 mm 6
8 Sept. Sunny
Sunny
 25° /14° 3.1 mm 5
9 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 19° /11° 11.5 mm 4
10 Sept. Sunny
Sunny
 21° /9° 1.2 mm 5
11 Sept. Partly cloudy
Partly cloudy
 20° /10° 5 mm 5
12 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 20° /9° 1.5 mm 4
13 Sept. Overcast
Overcast
 21° /13° 0.7 mm 5.2
14 Sept. Overcast
Overcast
 21° /15° 0.2 mm 5.4
15 Sept. Overcast
Overcast
 23° /14° 0 mm 5.5
16 Sept. Patchy rain possible
Patchy rain possible
 18° /11° 1.8 mm 5
17 Sept. Overcast
Overcast
 17° /10° 1 mm 4.8
18 Sept. Overcast
Overcast
 15° /11° 0 mm 4
19 Sept. Sunny
Sunny
 19° /10° 0 mm 5
20 Sept. Overcast
Overcast
 19° /13° 0 mm 5
21 Sept. Sunny
Sunny
 21° /12° 0 mm 6
22 Sept. Overcast
Overcast
 17° /13° 0 mm 4
23 Sept. Sunny
Sunny
 20° /10° 0 mm 6
24 Sept. Sunny
Sunny
 23° /14° 0 mm 6
25 Sept. Sunny
Sunny
 25° /12° 0 mm 6
26 Sept. Mist
Mist
 17° /9° 3.7 mm 4
27 Sept. Overcast
Overcast
 17° /6° 2.5 mm 4
28 Sept. Overcast
Overcast
 16° /5° 1.9 mm 4
29 Sept. Sunny
Sunny
 18° /6° 0 mm 5
30 Sept. Sunny
Sunny
 18° /7° 0.5 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 128.8 mm is expected in Biel/Bienne during September, occurring over more than 14 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 💧
Typically, Biel/Bienne has 14 rainy days in September with a total of 128.8 mm of rainfall.

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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