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Switzerland weather

Weather in Interlaken for September 2025

Your guide to Interlaken weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Interlaken is cooler than usual, with temperatures averaging 13 °C, this is -4.5 °C below the typical seasonal average.

  • Expect cooler weather in the next days in Interlaken with the forecast suggesting a temperature of 14.7 °C, lower than the historical average.

  • In general, the average temperature in Interlaken at the beginning of September is 18.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 11.7 °C by the end of September.

    • Rain 🌧️

  • The climate of Interlaken in September is notably wet, with an average of 15 rainy days, and a total of 573.5 mm of precipitation.

Average dry days
15
Dry days
Average rainy days
15
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/3°
Temperatures
Average wind speed
8 km/h
Avg max wind
Average humidity
79 %
Avg humidity

Interlaken Weather September

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

Temperatures trend during September in Interlaken

See the weather trend as well as the moving average line

September weather in Interlaken day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 17° /7° 6.5 mm 4
2 Sept. Patchy rain possible
Patchy rain possible
 18° /8° 5.4 mm 4
3 Sept. Cloudy
Cloudy
 18° /8° 2.8 mm 4
4 Sept. Patchy rain possible
Patchy rain possible
 18° /8° 7.7 mm 5
5 Sept. Cloudy
Cloudy
 18° /9° 3.1 mm 5
6 Sept. Cloudy
Cloudy
 20° /8° 0.5 mm 5
7 Sept. Sunny
Sunny
 21° /9° 1.3 mm 6
8 Sept. Sunny
Sunny
 18° /10° 6.4 mm 5
9 Sept. Light rain shower
Light rain shower
 15° /8° 7.2 mm 4
10 Sept. Patchy rain possible
Patchy rain possible
 16° /8° 2.9 mm 4
11 Sept. Moderate rain at times
Moderate rain at times
 16° /7° 2.4 mm 4
12 Sept. Light rain shower
Light rain shower
 15° /5° 3.2 mm 4
13 Sept. Patchy rain possible
Patchy rain possible
 15° /7° 8.4 mm 4
14 Sept. Moderate rain
Moderate rain
 15° /7° 5.2 mm 1.3
15 Sept. Moderate rain
Moderate rain
 18° /8° 6.5 mm 1.5
16 Sept. Patchy rain possible
Patchy rain possible
 10° /6° 2.1 mm 0.6
17 Sept. Partly cloudy
Partly cloudy
 16° /6° 0 mm 0.5
18 Sept. Sunny
Sunny
 19° /10° 0 mm 1.6
19 Sept. Sunny
Sunny
 20° /9° 0 mm 4
20 Sept. Sunny
Sunny
 20° /11° 0 mm 4
21 Sept. Patchy rain possible
Patchy rain possible
 20° /11° 1.4 mm 3
22 Sept. Patchy rain possible
Patchy rain possible
 12° /8° 4 mm 3
23 Sept. Patchy rain possible
Patchy rain possible
 9° /5° 0.5 mm 2
24 Sept. Sunny
Sunny
 14° /4° 0 mm 3
25 Sept. Patchy rain possible
Patchy rain possible
 16° /8° 0.3 mm 3
26 Sept. Patchy rain possible
Patchy rain possible
 9° /7° 2.9 mm 2
27 Sept. Moderate rain
Moderate rain
 8° /6° 9.1 mm 2
28 Sept. Patchy rain possible
Patchy rain possible
 11° /5° 12.3 mm 3
29 Sept. Patchy rain possible
Patchy rain possible
 12° /4° 3.7 mm 3
30 Sept. Patchy rain possible
Patchy rain possible
 12° /5° 1.5 mm 3
Next
Important Notice
Our weather forecast for Interlaken 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 Interlaken forecast closer to your planned date for the most up-to-date weather information.
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Interlaken in September - FAQ

What are the expected maximum and minimum temperatures in Interlaken during September?
During September, expect a variety of temperatures with highs around 19° and lows near 3°, suitable for diverse activities and preferences.
How much rainfall should be expected in Interlaken during September?
Significant rainfall exceeding 573.5 mm is expected in Interlaken during September, occurring over more than 15 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Interlaken during September?
The average wind speed in Interlaken during September is 8 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Interlaken

Explore the daily rainfall trends and prepare for Interlakens September weather 💧

UV exposure in Interlaken during September

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

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Get accurate weather forecasts for Interlaken, located at latitude 46.684 and longitude 7.866. Stay updated with localized weather information tailored for Interlaken.

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