Grisons (St. Moritz)
September
Weather in Grisons for September 2025
Your guide to Grisons weather in September - trends and predictions
With an average of 5 snowy days, Grisons usually enjoys a light touch of snow in September.
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.
Snow Forecast ❄️
Temperatures
8
Dry days
17
Rainy days
5
Snow days
12°/0°
Temperatures
13 km/h
Avg max wind
81 %
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 12° and colder nights, dipping below 0°.
How much rainfall should be expected in Grisons during September?
Significant rainfall exceeding 137.4 mm is expected in Grisons during September, occurring over more than 17 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Grisons in September 2025?
Grisons experiences an average snowfall of 16.67 cm during September, occurring over 5 days.
What are the typical wind conditions in Grisons during September?
The average wind speed in Grisons during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
Grisons snow forecast September 2025
Track daily snowfall levels and discover Grisons’s snowy potential this September ❄️
September rainfall patterns in Grisons
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