St. Moritz Weather in September
Thinking of visiting St. Moritz in September? Expect low temperatures reaching 11°C (52°F) during the day, dropping to 2°C (36°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in St. Moritz in September
Records from the past 30 years suggest around 15 days of rain, with 118 mm (4.6 in) average for the month. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in St. Moritz in September
September in St. Moritz sees highs of 11°C (52°F) and lows of 2°C (36°F) overnight. Temperatures remain on the cold side all day. A proper warm jacket is worth having, not just for evenings. At 2°C (36°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in St. Moritz in September
The month experiences a moderate amount of sunlight, with 156 hours of sunshine. This provides a nice balance between sunshine and clouds.If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit St. Moritz. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Switzerland, check out our St. Moritz's climate page.
St. Moritz Temperature in September
Min Temperature
2°C (36°F)
Max Temperature
11°C (52°F)
Chance of Rain
51%
Precipitation
118 mm (4.6 in)
Rainy days
15 days
Humidity
76% *
Sunshine
156 hours *
Percentage Sunshine
58% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in St. Moritz typically stay consistent throughout September, with daily highs averaging around 11°C (52°F). Nights are cold, with lows typically ranging from 0°C (32°F) to 4°C (39°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for St. Moritz in September
Browse day-by-day weather records for St. Moritz spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
St. Moritz historical weather extremes in September
Our historical data for St. Moritz spans 1976 to 2025, revealing these weather extremes.
- St. Moritz recorded its highest September temperature of 27°C (81°F) on September 15, 1987.
- The coldest September day was on September 26, 2020, with a maximum of -1°C (30°F).
- The lowest overnight temperature recorded in September was -9°C (16°F) (September 30, 1995).
- Peak precipitation in September occurred on September 18, 2011, when 45 mm (1.8 in) of precipitation was measured.
Best Places in Switzerland in September
Find out more about the weather in Switzerland and which places have the best travel conditions in this month. See all of Switzerland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in St. Moritz in September
The weather can swing between comfortable and chilly in September, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Expect heavy rainfall, so bring good rain protection and waterproof bags. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in St. Moritz in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Switzerland, check out our St. Moritz's climate page.
Temperature Rainfall Sunshine Humidity
See the full St. Moritz climate overview or explore weather in Switzerland.
