Interlaken
September
Weather in Interlaken for September 2026
Your guide to Interlaken weather in September - trends and predictions
Until now, September 2026 in Interlaken has been nearly identical to the historical average, with a temperature of 17.6 °C (showing only a slight deviation of 0.3 °C).
Expect cooler weather in the next days in Interlaken with the forecast suggesting a temperature of 13.6 °C, lower than the historical average.
In general, the average temperature in Interlaken at the beginning of September is 18.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12 °C by the end of September.
Interlaken experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 137.5 mm.
Temperatures
Rain 🌧️
1
Dry days
29
Rainy days
0
Snow days
15°/7°
Temperatures
8 km/h
Avg max wind
79 %
Avg humidity
Interlaken Weather September
Move between months or click on a day
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
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 17° /7° | 5.4 mm | 5 | |
| 2 Sept. |  Patchy rain possible | 18° /8° | 4.5 mm | 4 | |
| 3 Sept. | Sunny | 18° /9° | 2.3 mm | 5 | |
| 4 Sept. | Patchy rain possible | 19° /9° | 6.4 mm | 5 | |
| 5 Sept. |  Cloudy | 18° /9° | 2.7 mm | 5 | |
| 6 Sept. | Sunny | 20° /9° | 0.4 mm | 5 | |
| 7 Sept. | Sunny | 21° /10° | 1.3 mm | 6 | |
| 8 Sept. | Sunny | 19° /11° | 5.5 mm | 5 | |
| 9 Sept. | Light rain shower | 16° /8° | 9.6 mm | 3 | |
| 10 Sept. | Patchy rain possible | 15° /8° | 2.6 mm | 3 | |
| 11 Sept. |  Moderate rain at times | 16° /7° | 2 mm | 4 | |
| 12 Sept. | Light rain shower | 15° /5° | 3.2 mm | 4 | |
| 13 Sept. |  Overcast | 17° /9° | 0.1 mm | 5.8 | |
| 14 Sept. | Sunny | 16° /10° | 0.1 mm | 5.6 | |
| 15 Sept. | Sunny | 20° /11° | 0 mm | 6.1 | |
| 16 Sept. | Light rain shower | 16° /7° | 8.9 mm | 5.7 | |
| 17 Sept. | Patchy rain possible | 7° /4° | 10.6 mm | 2.9 | |
| 18 Sept. | Overcast | 10° /5° | 0.1 mm | 3 | |
| 19 Sept. | Overcast | 13° /9° | 0 mm | 4 | |
| 20 Sept. | Overcast | 14° /12° | 0 mm | 4 | |
| 21 Sept. | Sunny | 14° /12° | 0 mm | 4 | |
| 22 Sept. | Sunny | 14° /11° | 0 mm | 4 | |
| 23 Sept. |  Mist | 12° /1° | 22.3 mm | 2 | |
| 24 Sept. | Sunny | 13° /9° | 0 mm | 4 | |
| 25 Sept. | Patchy rain possible | 12° /8° | 0.5 mm | 3 | |
| 26 Sept. | Overcast | 12° /5° | 10.4 mm | 3 | |
| 27 Sept. | Overcast | 12° /4° | 4.7 mm | 3 | |
| 28 Sept. | Patchy rain possible | 11° /4° | 9.8 mm | 3 | |
| 29 Sept. | Patchy rain possible | 12° /4° | 3 mm | 3 | |
| 30 Sept. | Patchy rain possible | 12° /4° | 1.2 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.
Change Month
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 15° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in Interlaken during September?
Significant rainfall exceeding 137.5 mm is expected in Interlaken during September, occurring over more than 29 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 💧
Typically, Interlaken has 29 rainy days in September with a total of 137.5 mm of rainfall.
UV exposure in Interlaken during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Quick links
More Interlaken weather pages
You are here
Where is Interlaken?Get accurate weather forecasts for Interlaken, located at latitude 46.684 and longitude 7.866. Stay updated with localized weather information tailored for Interlaken.
Related locations
Select a location for accurate weather forecast
More Locations Found a mistake?
We appreciate your attention to details. Tell us here.