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Switzerland
The weather in September in St. Gallen
Looking for sun and warm weather? September isn’t a good month to be in St. Gallen. The temperatures are too low for a warm stay this month.
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for St. Gallen, Switzerland. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Daily weather in September for St. Gallen
Click on any day in September to get detailed info about the usual weather on that day in St. Gallen. Check out the historical temperatures and precipitation over the past 10 years on this day.
Average temperatures
It's cool to moderate in September in St. Gallen with an average temperature of 17°C. Temperatures this month range from a low of 14°C to a high of 20°C. At night, you can expect temperatures between 8°C and 13°C.
Temperature records
With 28°C in 2023, St. Gallen reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 6°C in 2020. The extreme nighttime temperatures ranged from a lowest recorded value of 2°C to a highest value of 18°C.
Precipitation and snowfall
In September, there is an average of 125 mm of precipitation, spread over 15 days. Of the total precipitation, about 0,1 cm falls as snow in September. The wind speed is around 3 Bft, mostly coming from the Southwest.
September weather comparison
| St. Gallen | New York | |
|---|---|---|
| Average temperature | 17°C | 27°C |
| Max. temperature | 20°C | 31°C |
| Min. temperature | 8°C | -5°C |
| Total precipitation | 125 mm | 57 mm |
| Rainy days | 15 days | 9 days |
| Total snowfall | 0,1 cm | 0 cm |
| Snowy days | 1 day | 0 days |
Start of September
The month of September starts in St. Gallen with mild temps, averaging around 19°C during the day and nights around 12°C.
Mid September
By mid-September, daytime temps stay steady at around 19°C, with nights around 12°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of September
By the end of September, the average daytime temperature in St. Gallen is around 16°C, while nighttime temps are about 9°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
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UV index
The UV index is a maximum of 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Check out the climate of St. Gallen for all months and discover the best travel time
Curious about the weather in other parts of Switzerland? Check out the climate and weather for spots like Zurich, Geneva, Valais, or explore other destinations in Switzerland.
Temperature charts
These charts show the average temperatures in September in St. Gallen, Switzerland. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in St. Gallen
Temperature in September in St. Gallen over the years
Precipitation charts
These charts show the average amount of precipitation in September in St. Gallen, Switzerland. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in St. Gallen
Total precipitation in September in St. Gallen over the years
Daily Snowfall in September in St. Gallen
Snowfall in September in St. Gallen per year
Daily UV index in September in St. Gallen
This chart shows the average daily UV index in September in St. Gallen, 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.
Weather experiences in September in St. Gallen
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Average weather in St. Gallen by month
Click on a month below to see detailed weather info for St. Gallen. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.