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 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.7 °C by the end of September.
The climate of Interlaken in September is notably wet, with an average of 15 rainy days.
Is September a good time to visit Interlaken? check out the best time to travel to Interlaken page.
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15
Dry days
15
Rainy days
0
Snow days
17°/8°
Temperatures
8 km/h
Avg max wind
74 %
Avg humidity
Interlaken in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  19° | 2 18° | 3  19° | 4  18° | 5 19° | 6 19° | 7  21° |
| 8 19° | 9 15° | 10 17° | 11  17° | 12  12° | 13 7° | 14 8° |
| 15 12° | 16 14° | 17 13° | 18 14° | 19 13° | 20 15° | 21 15° |
| 22 11° | 23 8° | 24 11° | 25 13° | 26 13° | 27 14° | 28 10° |
| 29 14° | 30 14° |
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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. | Patchy rain possible | 19° /8° | 3.1 mm | 5 | |
| 2 Sept. | Patchy rain possible | 18° /8° | 5.7 mm | 4 | |
| 3 Sept. | Sunny | 19° /9° | 5.4 mm | 5 | |
| 4 Sept. | Overcast | 18° /9° | 5.2 mm | 5 | |
| 5 Sept. | Sunny | 19° /10° | 4.1 mm | 5 | |
| 6 Sept. | Sunny | 19° /9° | 0.5 mm | 5 | |
| 7 Sept. | Partly cloudy | 21° /10° | 0.1 mm | 6 | |
| 8 Sept. | Patchy rain possible | 19° /10° | 6.4 mm | 5 | |
| 9 Sept. | Patchy rain possible | 15° /9° | 10.1 mm | 4 | |
| 10 Sept. | Patchy rain possible | 17° /8° | 0.8 mm | 4 | |
| 11 Sept. | Moderate rain at times | 17° /8° | 5.3 mm | 4 | |
| 12 Sept. | Thundery outbreaks possible | 12° /5° | 7.6 mm | 3 | |
| 13 Sept. | Moderate or heavy rain shower | 7° /4° | 16.4 mm | 2 | |
| 14 Sept. | Thundery outbreaks possible | 8° /3° | 0.8 mm | 2 | |
| 15 Sept. | Partly cloudy | 12° /3° | 0 mm | 4 | |
| 16 Sept. | Light rain shower | 14° /4° | 2 mm | 3 | |
| 17 Sept. | Sunny | 13° /5° | 0.1 mm | 4 | |
| 18 Sept. | Light rain shower | 14° /5° | 6.5 mm | 4 | |
| 19 Sept. | Patchy rain possible | 13° /4° | 2.2 mm | 3 | |
| 20 Sept. | Patchy rain possible | 15° /5° | 1.4 mm | 4 | |
| 21 Sept. | Patchy rain possible | 15° /6° | 1.3 mm | 4 | |
| 22 Sept. | Light rain shower | 11° /4° | 13.3 mm | 3 | |
| 23 Sept. | Light rain shower | 8° /3° | 7.6 mm | 2 | |
| 24 Sept. | Sunny | 11° /2° | 1.6 mm | 3 | |
| 25 Sept. | Sunny | 13° /3° | 0.1 mm | 4 | |
| 26 Sept. | Sunny | 13° /6° | 11.3 mm | 4 | |
| 27 Sept. | Sunny | 14° /5° | 2.7 mm | 4 | |
| 28 Sept. | Sunny | 10° /4° | 6.7 mm | 3 | |
| 29 Sept. | Sunny | 14° /4° | 0.1 mm | 4 | |
| 30 Sept. | Patchy rain possible | 14° /6° | 1.8 mm | 4 | |
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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?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Interlaken during September?
Moderate rainfall is anticipated in Interlaken during September, with a total of 80.6 mm spread over approximately 15 days. Considering plans for rainy days is advisable.
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
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