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Grisons (St. Moritz)
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Switzerland weather

Weather in Grisons for September 2026

Your guide to Grisons weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Giallo Vento Allerta - See hour by hour.

    • Snow Forecast ❄️

  • With an average of 3 snowy days, Grisons usually enjoys a light touch of snow in September.
    According to Grisons snow forecast for September 2026, 2 snowy days are expected in the next 2 weeks. The closest date with snow is Thursday, 17 September.

    • Temperatures

  • Until now, September 2026 in Grisons is slightly cooler than the historical average by 0.6 °C.

  • The forecast for the next days in Grisons predicts a temperature of 9.5 °C, which is cooler than the historical average.

  • In general, the average temperature in Grisons at the beginning of September is 15.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 10.4 °C by the end of September.

    • Rain 🌧️

  • The climate of Grisons in September is notably wet, with an average of 12 rainy days, and a total of 135.5 mm of precipitation.

Average dry days
15
Dry days
Average rainy days
12
Rainy days
Average snowy days
3
Snow days
Average temperatures
12°/0°
Temperatures
Average wind speed
12 km/h
Avg max wind
Average humidity
80 %
Avg humidity

Grisons Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
14°
2
Patchy light rain with thunder
14°
3
Sunny
15°
4
Overcast
17°
5
Sunny
14°
6
Sunny
17°
7
Sunny
18°
8
Patchy rain possible
17°
9
Patchy rain possible
14°
10
Patchy rain possible
14°
11
Weather Alert Mist
9°
12
Weather Alert Sunny
11°
13
Overcast
12°
14
Sunny
11°
15
Sunny
14°
16
Light rain shower
11°
17
Fog
4°
18
Patchy rain possible
5°
19
Patchy rain possible
8°
20
Overcast
10°
21
Sunny
11°
22
Light snow showers
2°
23
Sunny
11°
24
Sunny
14°
25
Sunny
10°
26
Sunny
9°
27
Patchy light rain with thunder
10°
28
Sunny
9°
29
Mist
10°
30
Patchy rain possible
11°

What’s the Weather Like in Grisons This September?

Discover the average temperatures and weather trends across Grisons’s cities this September.
Patchy light rain with thunderSt. Moritz12 °C / 0 °CPatchy rain possibleChur15 °C / 6 °CPatchy rain possibleDavos13 °C / 4 °CPatchy rain possibleSeewis im Prätigau13 °C / 5 °CPatchy rain possibleDavos Platz12 °C / 3 °CPatchy rain possibleArosa13 °C / 4 °CPatchy rain possibleFlims16 °C / 3 °CPatchy rain possibleLaax16 °C / 3 °CMore Locations

Temperatures trend during September in Grisons

See the weather trend as well as the moving average line

September weather in Grisons day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
1 Sept. Partly cloudy
Partly cloudy
 14° /2° 6.6 mm 0 cm
2 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 14° /2° 4.2 mm 0 cm
3 Sept. Sunny
Sunny
 15° /1° 0.9 mm 0 cm
4 Sept. Overcast
Overcast
 17° /4° 2.4 mm 0 cm
5 Sept. Sunny
Sunny
 14° /3° 5.2 mm 0 cm
6 Sept. Sunny
Sunny
 17° /2° 0 mm 0 cm
7 Sept. Sunny
Sunny
 18° /3° 1.1 mm 0 cm
8 Sept. Patchy rain possible
Patchy rain possible
 17° /4° 2 mm 0 cm
9 Sept. Patchy rain possible
Patchy rain possible
 14° /3° 11.4 mm 0 cm
10 Sept. Patchy rain possible
Patchy rain possible
 14° /2° 5.2 mm 0 cm
11 Sept. Mist
Mist
 9° /2° 0.1 mm 0 cm
12 Sept. Sunny
Sunny
 11° /1° 0 mm 0 cm
13 Sept. Overcast
Overcast
 12° /2° 0 mm 0 cm
14 Sept. Sunny
Sunny
 11° /4° 0.1 mm 0 cm
15 Sept. Sunny
Sunny
 14° /5° 0.1 mm 0 cm
16 Sept. Light rain shower
Light rain shower
 11° /5° 8.5 mm 0 cm
17 Sept. Fog
Fog
 4° /0° 35.4 mm 10.9 cm
18 Sept. Patchy rain possible
Patchy rain possible
 5° /-2° 0 mm 0 cm
19 Sept. Patchy rain possible
Patchy rain possible
 8° /0° 0 mm 0 cm
20 Sept. Overcast
Overcast
 10° /1° 0 mm 0 cm
21 Sept. Sunny
Sunny
 11° /3° 0 mm 0 cm
22 Sept. Light snow showers
Light snow showers
 2° /-4° 0.8 mm 0.4 cm
23 Sept. Sunny
Sunny
 11° /-5° 0 mm 0 cm
24 Sept. Sunny
Sunny
 14° /4° 0 mm 0 cm
25 Sept. Sunny
Sunny
 10° /-2° 2.6 mm 0.1 cm
26 Sept. Sunny
Sunny
 9° /-1° 5.1 mm 1.1 cm
27 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 10° /-1° 6.4 mm 0.3 cm
28 Sept. Sunny
Sunny
 9° /-4° 6.7 mm 5 cm
29 Sept. Mist
Mist
 10° /-4° 0.1 mm 0 cm
30 Sept. Patchy rain possible
Patchy rain possible
 11° /-2° 0 mm 0 cm
Next
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?
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 135.5 mm is expected in Grisons during September, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.

Will it snow in Grisons in September 2026?
Grisons experiences an average snowfall of 12.7 cm during September, occurring over 3 days.

What are the typical wind conditions in Grisons during September?
The average wind speed in Grisons during September is 12 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 ❄️
On average, Grisons sees 3 snowy days during September, with approximately 12.7 cm of total snowfall.

September rainfall patterns in Grisons

Explore the daily rainfall trends and prepare for Grisonss September weather 💧
Typically, Grisons has 12 rainy days in September with a total of 135.5 mm of rainfall.
Provinces in Grisons
Select a province for an accurate weather forecast
Region ImbodenRegion MalojaRegion PlessurRegion Prättigau / DavosRegion Surselva
Top locations in Grisons
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ArosaChurDavosDavos PlatzFlimsLaaxSeewis im PrätigauSt. Moritz
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Location coordinates Where is Grisons?

Get accurate weather forecasts for Grisons, located at latitude 46.499 and longitude 9.843. Stay updated with localized weather information tailored for Grisons.

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