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St. Moritz
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Switzerland weather

Weather in St. Moritz for September 2026

Your guide to St. Moritz weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in St. Moritz 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.

    • Rain 🌧️

  • St. Moritz in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 406.4 mm.

Average dry days
12
Dry days
Average rainy days
18
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/-3°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
80 %
Avg humidity

St. Moritz Weather September

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

Temperatures trend during September in St. Moritz

See the weather trend as well as the moving average line

September weather in St. Moritz 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° 8.5 mm 0 cm
2 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 14° /1° 5.4 mm 0 cm
3 Sept. Sunny
Sunny
 15° /1° 1.2 mm 0 cm
4 Sept. Overcast
Overcast
 17° /3° 3.3 mm 0 cm
5 Sept. Sunny
Sunny
 13° /2° 6.8 mm 0 cm
6 Sept. Sunny
Sunny
 17° /1° 0 mm 0 cm
7 Sept. Sunny
Sunny
 18° /1° 0 mm 0 cm
8 Sept. Patchy rain possible
Patchy rain possible
 17° /3° 2 mm 0 cm
9 Sept. Patchy rain possible
Patchy rain possible
 14° /2° 9.4 mm 0 cm
10 Sept. Patchy rain possible
Patchy rain possible
 14° /2° 5.2 mm 0 cm
11 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 14° /1° 3.8 mm 0 cm
12 Sept. Partly cloudy
Partly cloudy
 12° /-1° 5.3 mm 3 cm
13 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 9° /-2° 7.9 mm 1.7 cm
14 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 8° /-2° 2.6 mm 1.2 cm
15 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 11° /-2° 0 mm 0 cm
16 Sept. Patchy rain possible
Patchy rain possible
 10° /-3° 0.7 mm 0 cm
17 Sept. Partly cloudy
Partly cloudy
 11° /-2° 0.5 mm 0.1 cm
18 Sept. Moderate rain
Moderate rain
 15° /0° 7.4 mm 0 cm
19 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 14° /1° 3.9 mm 0 cm
20 Sept. Light rain shower
Light rain shower
 14° /1° 0.5 mm 0 cm
21 Sept. Patchy rain possible
Patchy rain possible
 12° /1° 1.1 mm 0 cm
22 Sept. Light rain shower
Light rain shower
 10° /1° 16.7 mm 0 cm
23 Sept. Light sleet showers
Light sleet showers
 8° /0° 10.7 mm 0 cm
24 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 7° /-3° 11.5 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 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.
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St. Moritz in September - FAQ

What are the expected maximum and minimum temperatures in St. Moritz 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 St. Moritz during September?
Significant rainfall exceeding 406.4 mm is expected in St. Moritz during September, occurring over more than 18 days. Preparing for wet conditions is recommended in your planning.
Will it snow in St. Moritz in September 2026?
St. Moritz typically sees 38 cm of snowfall during September.
What are the typical wind conditions in St. Moritz during September?
The average wind speed in St. Moritz during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

St. Moritz snow forecast September 2026

Track daily snowfall levels and discover St. Moritz’s snowy potential this September ❄️

September rainfall patterns in St. Moritz

Explore the daily rainfall trends and prepare for St. Moritzs September weather 💧

Quick links

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Location coordinates 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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