Saint Gallen (Sankt Gallen)
September
Weather in Saint Gallen for September 2025
Your guide to Saint Gallen weather in September - trends and predictions
Until now, September 2025 in Saint Gallen is slightly cooler than the historical average by -1.9 °C.
The forecast for the next days in Saint Gallen predicts temperatures to be around 15 °C, close to the historical average.
In general, the average temperature in Saint Gallen at the beginning of September is 21.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 11.4 °C by the end of September.
Saint Gallen experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 127 mm.
Temperatures
Rain 🌧️
9
Dry days
21
Rainy days
0
Snow days
18°/10°
Temperatures
9 km/h
Avg max wind
80 %
Avg humidity
Saint Gallen Weather September
Move between months or click on a day
Temperatures trend during September in Saint Gallen
See the weather trend as well as the moving average line
September weather in Saint Gallen day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Moderate rain at times | 20° /12° | 4.1 mm | 5 | |
| 2 Sept. |  Sunny | 21° /12° | 5 mm | 5 | |
| 3 Sept. | Sunny | 22° /12° | 2.6 mm | 5 | |
| 4 Sept. |  Partly cloudy | 22° /13° | 4.5 mm | 5 | |
| 5 Sept. | Sunny | 20° /11° | 5.8 mm | 5 | |
| 6 Sept. | Sunny | 21° /10° | 0 mm | 5 | |
| 7 Sept. | Sunny | 22° /11° | 0 mm | 6 | |
| 8 Sept. |  Light rain shower | 22° /13° | 5.7 mm | 6 | |
| 9 Sept. | Light rain shower | 19° /13° | 9.2 mm | 5 | |
| 10 Sept. | Patchy rain possible | 19° /12° | 2.4 mm | 4 | |
| 11 Sept. | Sunny | 19° /11° | 4.7 mm | 5 | |
| 12 Sept. |  Thundery outbreaks possible | 16° /10° | 4.2 mm | 3 | |
| 13 Sept. | Light rain shower | 15° /9° | 8 mm | 3 | |
| 14 Sept. | Light rain shower | 14° /9° | 9.4 mm | 3 | |
| 15 Sept. |  Mist | 19° /8° | 1.3 mm | 5 | |
| 16 Sept. | Patchy rain possible | 17° /8° | 2.2 mm | 4 | |
| 17 Sept. | Sunny | 18° /10° | 3.4 mm | 5 | |
| 18 Sept. | Sunny | 21° /11° | 0 mm | 1.3 | |
| 19 Sept. | Sunny | 23° /13° | 0 mm | 1.3 | |
| 20 Sept. | Sunny | 24° /15° | 0 mm | 1.3 | |
| 21 Sept. | Sunny | 23° /14° | 0 mm | 1.2 | |
| 22 Sept. |  Moderate rain | 16° /14° | 6.8 mm | 0.3 | |
| 23 Sept. | Moderate rain | 12° /9° | 7.8 mm | 3 | |
| 24 Sept. | Moderate rain | 9° /7° | 12.9 mm | 2 | |
| 25 Sept. | Patchy rain possible | 10° /5° | 4.4 mm | 2 | |
| 26 Sept. | Partly cloudy | 12° /2° | 0 mm | 3 | |
| 27 Sept. | Patchy rain possible | 11° /3° | 0.4 mm | 2 | |
| 28 Sept. | Patchy rain possible | 12° /4° | 0.1 mm | 2 | |
| 29 Sept. | Sunny | 11° /2° | 0 mm | 3 | |
| 30 Sept. | Sunny | 15° /4° | 0 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for Saint Gallen 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 Saint Gallen forecast closer to your planned date for the most up-to-date weather information.
Change Month
Saint Gallen in September - FAQ
What are the expected maximum and minimum temperatures in Saint Gallen during September?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Saint Gallen during September?
Significant rainfall exceeding 127 mm is expected in Saint Gallen during September, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Saint Gallen during September?
The average wind speed in Saint Gallen during September is 9 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Saint Gallen
Explore the daily rainfall trends and prepare for Saint Gallens September weather 💧
UV exposure in Saint Gallen during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Provinces in Saint Gallen
Select a province for an accurate weather forecast
Top locations in Saint Gallen
Select a location for an accurate weather forecast
More Locations Quick links
More Saint Gallen weather pages
You are here
Where is Saint Gallen?Get accurate weather forecasts for Saint Gallen, located at latitude 47.424 and longitude 9.375. Stay updated with localized weather information tailored for Saint Gallen.
Found a mistake?
We appreciate your attention to details. Tell us here.