St. Moritz
September
Weather in St. Moritz for September 2025
Your guide to St. Moritz weather in September - trends and predictions
In general, the average temperature in St. Moritz at the beginning of September is 16.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 10.4 °C by the end of September.
The climate of St. Moritz in September is notably wet, with an average of 13 rainy days.
Snowfall in St. Moritz during September is quite rare, with fewer than 2 snowy days on average.
Is September a good time to visit St. Moritz? check out the best time to travel to St. Moritz page.
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16
Dry days
13
Rainy days
1
Snow days
15°/2°
Temperatures
11 km/h
Avg max wind
77 %
Avg humidity
St. Moritz in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  15° | 2  16° | 3  16° | 4  17° | 5 17° | 6 18° | 7 18° |
| 8 18° | 9 14° | 10 16° | 11  15° | 12 12° | 13  7° | 14  6° |
| 15 8° | 16 9° | 17 11° | 18  12° | 19 11° | 20 11° | 21 10° |
| 22 10° | 23  6° | 24 7° | 25 11° | 26 11° | 27 12° | 28 10° |
| 29 10° | 30 12° |
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Temperatures trend during September in St. Moritz
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| 1 Sept. | Partly cloudy | 15° /2° | 4.8 mm | 0 cm | |
| 2 Sept. | Patchy rain possible | 16° /2° | 5.3 mm | 0 cm | |
| 3 Sept. | Sunny | 16° /2° | 1.9 mm | 0 cm | |
| 4 Sept. | Overcast | 17° /5° | 4.9 mm | 0 cm | |
| 5 Sept. | Sunny | 17° /4° | 3.1 mm | 0 cm | |
| 6 Sept. | Sunny | 18° /3° | 0 mm | 0 cm | |
| 7 Sept. | Sunny | 18° /2° | 0.1 mm | 0 cm | |
| 8 Sept. | Patchy rain possible | 18° /3° | 2.7 mm | 0 cm | |
| 9 Sept. | Patchy rain possible | 14° /2° | 12.1 mm | 0 cm | |
| 10 Sept. | Patchy rain possible | 16° /2° | 2.4 mm | 0 cm | |
| 11 Sept. | Patchy light rain with thunder | 15° /2° | 5.5 mm | 0 cm | |
| 12 Sept. | Partly cloudy | 12° /-1° | 7 mm | 4.5 cm | |
| 13 Sept. | Thundery outbreaks possible | 7° /-2° | 10.2 mm | 2.6 cm | |
| 14 Sept. | Moderate or heavy rain shower | 6° /-3° | 4 mm | 1.8 cm | |
| 15 Sept. | Thundery outbreaks possible | 8° /-3° | 0 mm | 0 cm | |
| 16 Sept. | Patchy rain possible | 9° /-4° | 0.2 mm | 0 cm | |
| 17 Sept. | Partly cloudy | 11° /-1° | 0.8 mm | 0.2 cm | |
| 18 Sept. | Moderate rain | 12° /-1° | 11.1 mm | 0 cm | |
| 19 Sept. | Patchy light rain with thunder | 11° /-1° | 5.9 mm | 0 cm | |
| 20 Sept. | Light rain shower | 11° /-1° | 0.7 mm | 0 cm | |
| 21 Sept. | Light rain shower | 10° /0° | 1.5 mm | 0 cm | |
| 22 Sept. | Light rain shower | 10° /-1° | 11.7 mm | 0 cm | |
| 23 Sept. | Light sleet showers | 6° /-2° | 14.1 mm | 0 cm | |
| 24 Sept. | Partly cloudy | 7° /-4° | 6.5 mm | 0 cm | |
| 25 Sept. | Sunny | 11° /-2° | 0.4 mm | 0 cm | |
| 26 Sept. | Sunny | 11° /0° | 3 mm | 0 cm | |
| 27 Sept. | Sunny | 12° /0° | 7.4 mm | 0 cm | |
| 28 Sept. | Sunny | 10° /-3° | 10 mm | 7.5 cm | |
| 29 Sept. | Partly cloudy | 10° /-4° | 0.1 mm | 0.1 cm | |
| 30 Sept. | Patchy rain possible | 12° /-1° | 0 mm | 0 cm | |
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Important Notice
Our weather forecast for St. Moritz 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 St. Moritz forecast closer to your planned date for the most up-to-date weather information.
St. Moritz in September - FAQ
What are the expected maximum and minimum temperatures in St. Moritz during September?
Prepare for cooler days with highs just around 15° and colder nights, dipping below 2°.
How much rainfall should be expected in St. Moritz during September?
Significant rainfall exceeding 110 mm is expected in St. Moritz during September, occurring over more than 13 days. Preparing for wet conditions is recommended in your planning.
Is snowfall common in St. Moritz during September?
St. Moritz experiences an average snowfall of 0.1 cm during September, occurring over 1 days, which may interest winter sports enthusiasts.
What are the typical wind conditions in St. Moritz during September?
The average wind speed in St. Moritz during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to St. Moritz in September?
As you prepare for your trip to St. Moritz 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 St. Moritz, 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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Where is St. Moritz?Get accurate weather forecasts for St. Moritz, located at latitude 46.499 and longitude 9.843. Stay updated with localized weather information tailored for St. Moritz.
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