Grisons (St. Moritz)
September
Weather in Grisons for September 2026
Your guide to Grisons weather in September - trends and predictions
In general, the average temperature in Grisons at the beginning of September is 15.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 9.4 °C by the end of September.
Grisons in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 406.4 mm.
Temperatures
Rain 🌧️
12
Dry days
18
Rainy days
0
Snow days
16°/-3°
Temperatures
13 km/h
Avg max wind
80 %
Avg humidity
Grisons Weather September
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What’s the Weather Like in Grisons This September?
Discover the average temperatures and weather trends across Grisons’s cities this September.
Temperatures trend during September in Grisons
See the weather trend as well as the moving average line
September weather in Grisons day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| 1 Sept. |  Partly cloudy | 14° /2° | 8.5 mm | 0 cm | |
| 2 Sept. |  Patchy light rain with thunder | 14° /1° | 5.4 mm | 0 cm | |
| 3 Sept. |  Sunny | 15° /1° | 1.2 mm | 0 cm | |
| 4 Sept. |  Overcast | 17° /3° | 3.3 mm | 0 cm | |
| 5 Sept. | Sunny | 13° /2° | 6.8 mm | 0 cm | |
| 6 Sept. | Sunny | 17° /1° | 0 mm | 0 cm | |
| 7 Sept. | Sunny | 18° /1° | 0 mm | 0 cm | |
| 8 Sept. |  Patchy rain possible | 17° /3° | 2 mm | 0 cm | |
| 9 Sept. | Patchy rain possible | 14° /2° | 9.4 mm | 0 cm | |
| 10 Sept. | Patchy rain possible | 14° /2° | 5.2 mm | 0 cm | |
| 11 Sept. | Patchy light rain with thunder | 14° /1° | 3.8 mm | 0 cm | |
| 12 Sept. | Partly cloudy | 12° /-1° | 5.3 mm | 3 cm | |
| 13 Sept. |  Thundery outbreaks possible | 9° /-2° | 7.9 mm | 1.7 cm | |
| 14 Sept. |  Moderate or heavy rain shower | 8° /-2° | 2.6 mm | 1.2 cm | |
| 15 Sept. | Thundery outbreaks possible | 11° /-2° | 0 mm | 0 cm | |
| 16 Sept. | Patchy rain possible | 10° /-3° | 0.7 mm | 0 cm | |
| 17 Sept. | Partly cloudy | 11° /-2° | 0.5 mm | 0.1 cm | |
| 18 Sept. |  Moderate rain | 15° /0° | 7.4 mm | 0 cm | |
| 19 Sept. | Patchy light rain with thunder | 14° /1° | 3.9 mm | 0 cm | |
| 20 Sept. | Light rain shower | 14° /1° | 0.5 mm | 0 cm | |
| 21 Sept. | Patchy rain possible | 12° /1° | 1.1 mm | 0 cm | |
| 22 Sept. | Light rain shower | 10° /1° | 16.7 mm | 0 cm | |
| 23 Sept. |  Light sleet showers | 8° /0° | 10.7 mm | 0 cm | |
| 24 Sept. | Patchy light rain with thunder | 7° /-3° | 11.5 mm | 0 cm | |
| 25 Sept. | Sunny | 10° /-2° | 2.6 mm | 0.1 cm | |
| 26 Sept. | Sunny | 9° /-1° | 5.1 mm | 1.1 cm | |
| 27 Sept. | Patchy light rain with thunder | 10° /-1° | 6.4 mm | 0.3 cm | |
| 28 Sept. | Sunny | 9° /-4° | 6.7 mm | 5 cm | |
| 29 Sept. |  Mist | 10° /-4° | 0.1 mm | 0 cm | |
| 30 Sept. | Patchy rain possible | 11° /-2° | 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.
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Grisons in September - FAQ
What are the expected maximum and minimum temperatures in Grisons during September?
During September, expect a variety of temperatures with highs around 16° and lows near -3°, suitable for diverse activities and preferences.
How much rainfall should be expected in Grisons during September?
Significant rainfall exceeding 406.4 mm is expected in Grisons during September, occurring over more than 18 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Grisons in September 2026?
Grisons typically sees 38 cm of snowfall during September.
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 2026
Track daily snowfall levels and discover Grisons’s snowy potential this September ❄️
September rainfall patterns in Grisons
Explore the daily rainfall trends and prepare for Grisonss September weather 💧
Typically, Grisons has 18 rainy days in September with a total of 406.4 mm of rainfall.
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