Interlaken
September
Weather in Interlaken for September 2025
Your guide to Interlaken weather in September - trends and predictions
In general, the average temperature in Interlaken at the beginning of September is 19.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.9 °C by the end of September.
Interlaken experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 123.7 mm.
Is September a good time to visit Interlaken? check out the best time to travel to Interlaken page.
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Temperatures
Rain 🌧️
More
2
Dry days
28
Rainy days
0
Snow days
15°/7°
Temperatures
8 km/h
Avg max wind
79 %
Avg humidity
Interlaken in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  19° | 2  19° | 3  19° | 4 19° | 5 20° | 6 20° | 7 21° |
| 8 19° | 9  16° | 10 17° | 11  17° | 12 16° | 13 15° | 14 14° |
| 15 15° | 16 15° | 17 13° | 18 14° | 19 12° | 20 13° | 21  14° |
| 22 13° | 23 13° | 24 13° | 25 15° | 26 14° | 27  13° | 28 11° |
| 29 12° | 30 12° |
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Temperatures trend during September in Interlaken
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Sunny | 19° /8° | 1.5 mm | 5 | |
| 2 Sept. | Patchy rain possible | 19° /8° | 3.1 mm | 4 | |
| 3 Sept. | Cloudy | 19° /9° | 3.4 mm | 4 | |
| 4 Sept. | Patchy rain possible | 19° /9° | 2.7 mm | 5 | |
| 5 Sept. | Cloudy | 20° /10° | 2.2 mm | 5 | |
| 6 Sept. | Cloudy | 20° /9° | 0.6 mm | 5 | |
| 7 Sept. | Sunny | 21° /10° | 1.7 mm | 6 | |
| 8 Sept. | Sunny | 19° /10° | 7.2 mm | 5 | |
| 9 Sept. | Heavy rain at times | 16° /9° | 6.6 mm | 4 | |
| 10 Sept. | Patchy rain possible | 17° /8° | 2.6 mm | 4 | |
| 11 Sept. | Moderate rain at times | 17° /8° | 2.8 mm | 4 | |
| 12 Sept. | Patchy rain possible | 16° /6° | 3.9 mm | 4 | |
| 13 Sept. | Patchy rain possible | 15° /7° | 8.4 mm | 4 | |
| 14 Sept. | Moderate rain at times | 14° /7° | 3.1 mm | 3 | |
| 15 Sept. | Moderate or heavy rain shower | 15° /7° | 6.5 mm | 4 | |
| 16 Sept. | Moderate or heavy rain shower | 15° /6° | 6.3 mm | 3 | |
| 17 Sept. | Patchy rain possible | 13° /6° | 3.4 mm | 3 | |
| 18 Sept. | Cloudy | 14° /5° | 3.4 mm | 4 | |
| 19 Sept. | Patchy rain possible | 12° /5° | 6.7 mm | 3 | |
| 20 Sept. | Moderate rain at times | 13° /5° | 1.2 mm | 3 | |
| 21 Sept. | Partly cloudy | 14° /4° | 0.7 mm | 4 | |
| 22 Sept. | Sunny | 13° /4° | 6.6 mm | 3 | |
| 23 Sept. | Sunny | 13° /3° | 3.8 mm | 4 | |
| 24 Sept. | Sunny | 13° /4° | 3.1 mm | 4 | |
| 25 Sept. | Moderate rain at times | 15° /4° | 2.8 mm | 4 | |
| 26 Sept. | Moderate rain at times | 14° /6° | 7.2 mm | 4 | |
| 27 Sept. | Overcast | 13° /5° | 4.7 mm | 3 | |
| 28 Sept. | Patchy rain possible | 11° /5° | 12.3 mm | 3 | |
| 29 Sept. | Patchy rain possible | 12° /4° | 3.7 mm | 3 | |
| 30 Sept. | Patchy rain possible | 12° /5° | 1.5 mm | 3 | |
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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.
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 123.7 mm is expected in Interlaken during September, occurring over more than 28 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.
What to pack to Interlaken in September?
As you prepare for your trip to Interlaken 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 Interlaken, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- 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
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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