Temperatures in September
It's cool in September in St. Moritz with an average temperature of 14°C. Temperatures this month range from a low of 11°C to a high of 16°C. At night, you can expect temperatures between 0°C and 6°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for St. Moritz in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in St. Moritz with cool temperatures, averaging around 15°C during the day and nights close to 5°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-September
By mid-September, the average daytime temperature stays the same at 15°C, with nights close to 5°C. There might be a few showers during this period, but plenty of dry days with sunshine too.
End of September
By the end of September, the average daytime temperature in St. Moritz will be around 13°C, with nights close to 2°C. A shower might show up, but overall the weather will be dry and sunny.
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Precipitation in September
In September, there is an average of 80 mm of precipitation, spread over 9 days. Of the total precipitation, about 11 cm falls as snow in September. The wind speed is around 4 Bft, mostly coming from the South.
The average precipitation chance is 29% per day this month. Though it seems pretty low, the weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for St. Moritz. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
St. Moritz in September |
London | ||
|---|---|---|---|
 Average Temperature |
14°C | 20°C | |
 High Temp |
16°C | 22°C | |
| Low Temp |
11°C | 17°C | |
 Total Precipitation |
80 mm | 44 mm | |
| Rainy Days |
9 days | 8 days | |
 Total Snowfall |
11 cm | 0 cm | |
| Snowy Days |
5 days | 0 days | |
August
UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Temperature records for St. Moritz in September
With 26°C, St. Moritz hit the highest temperature in the last 10 years in September 2023. The lowest daytime temperature in this month was 1°C in 2020. The extreme night temperatures ranged from a low of -8°C to a high of 12°C.
Check out the climate of St. Moritz for all months and discover the best travel time
Curious about the climate in other parts of Switzerland? Check out the weather and climate in places like Zurich, Geneva, Valais, or have a look at other destinations in Switzerland.
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Daily Temperature in September in St. Moritz
This chart shows the average daily temperatures, both day and night, for each day in September in St. Moritz, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in St. Moritz
The chart below shows the average daily precipitation in September for St. Moritz, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 9 days of rain in St. Moritz.
Daily Snowfall in September in St. Moritz
This chart shows the average daily snowfall in September in St. Moritz, measured in centimetres. The bottom of the chart shows the days of the month. The data is based on historical measurements and gives an idea of the average snowfall in September.
Daily UV Index in September in St. Moritz
This chart shows the average daily UV index in September in St. Moritz, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in St. Moritz Over the Years
This chart shows the average temperature in September in St. Moritz, measured in degrees Celsius, over the past years.
Total Precipitation in September in St. Moritz Over the Years
This chart shows the average precipitation in September in St. Moritz, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Snowfall in September in St. Moritz per year
This chart shows the average snowfall in September in St. Moritz, measured in centimetres, over the past years.
Daily climate in September for St. Moritz
Click on a specific day in September for detailed info on the typical weather on that day in St. Moritz. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in St. Moritz
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Average Weather in St. Moritz by Month
Click on a month below to see detailed weather info for St. Moritz. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of St. Moritz for all months at once
