Grisons (St. Moritz)
September
Weather in Grisons for September 2025
Your guide to Grisons weather in September - trends and predictions
In general, the average temperature in Grisons 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 Grisons in September is notably wet, with an average of 13 rainy days.
Snowfall in Grisons during September is quite rare, with fewer than 2 snowy days on average.
Is September a good time to visit Grisons? check out the best time to travel to Grisons 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
Grisons 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 Grisons
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 Grisons 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 Grisons forecast closer to your planned date for the most up-to-date weather information.
Grisons in September - FAQ
What are the expected maximum and minimum temperatures in Grisons during September?
Prepare for cooler days with highs just around 15° and colder nights, dipping below 2°.
How much rainfall should be expected in Grisons during September?
Significant rainfall exceeding 110 mm is expected in Grisons during September, occurring over more than 13 days. Preparing for wet conditions is recommended in your planning.
Is snowfall common in Grisons during September?
Grisons 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 Grisons during September?
The average wind speed in Grisons during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Grisons in September?
As you prepare for your trip to Grisons 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 Grisons, 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 Grisons
Explore the daily rainfall trends and prepare for Grisonss September weather 💧
September snowfall in Grisons
Track daily snowfall levels and discover Grisons’s snowy potential this September ❄️
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