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Sankt Gallen
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Switzerland weather

Weather in Sankt Gallen for September 2025

Your guide to Sankt Gallen weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Sankt Gallen is cooler than usual, with temperatures averaging 17.1 °C, this is -2.8 °C below the typical seasonal average.

  • The forecast for the next days in Sankt Gallen predicts temperatures to be around 19 °C, close to the historical average.

  • In general, the average temperature in Sankt Gallen at the beginning of September is 21.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.6 °C by the end of September.

    • Rain 🌧️

  • Sankt Gallen experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 127 mm.

Average dry days
9
Dry days
Average rainy days
21
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/10°
Temperatures
Average wind speed
9 km/h
Avg max wind
Average humidity
80 %
Avg humidity

Sankt Gallen Weather September

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

Temperatures trend during September in Sankt Gallen

See the weather trend as well as the moving average line

September weather in Sankt Gallen day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Moderate rain at times
Moderate rain at times
 20° /12° 4.1 mm 5
2 Sept. Sunny
Sunny
 21° /12° 5 mm 5
3 Sept. Sunny
Sunny
 22° /12° 2.6 mm 5
4 Sept. Partly cloudy
Partly cloudy
 22° /13° 4.5 mm 5
5 Sept. Sunny
Sunny
 20° /11° 5.8 mm 5
6 Sept. Sunny
Sunny
 21° /10° 0 mm 5
7 Sept. Sunny
Sunny
 22° /11° 0 mm 6
8 Sept. Light rain shower
Light rain shower
 22° /13° 5.7 mm 6
9 Sept. Light rain shower
Light rain shower
 19° /13° 9.2 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
 19° /12° 2.4 mm 4
11 Sept. Sunny
Sunny
 19° /11° 4.7 mm 5
12 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 16° /10° 4.2 mm 3
13 Sept. Light rain shower
Light rain shower
 15° /9° 8 mm 3
14 Sept. Mist
Mist
 12° /8° 4.5 mm 3
15 Sept. Moderate rain
Moderate rain
 22° /13° 5.1 mm 1.3
16 Sept. Patchy rain possible
Patchy rain possible
 15° /11° 1.7 mm 0.5
17 Sept. Partly cloudy
Partly cloudy
 15° /9° 0 mm 0.3
18 Sept. Sunny
Sunny
 22° /11° 0 mm 1.4
19 Sept. Sunny
Sunny
 21° /12° 0 mm 4
20 Sept. Sunny
Sunny
 23° /13° 0 mm 5
21 Sept. Sunny
Sunny
 22° /15° 0 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 17° /13° 0.7 mm 4
23 Sept. Patchy rain possible
Patchy rain possible
 19° /12° 4 mm 3
24 Sept. Patchy rain possible
Patchy rain possible
 19° /13° 1.1 mm 3
25 Sept. Patchy rain possible
Patchy rain possible
 17° /12° 0.5 mm 3
26 Sept. Patchy rain possible
Patchy rain possible
 14° /11° 3 mm 3
27 Sept. Partly cloudy
Partly cloudy
 17° /9° 0 mm 4
28 Sept. Partly cloudy
Partly cloudy
 14° /8° 9.6 mm 4
29 Sept. Sunny
Sunny
 18° /8° 0.4 mm 5
30 Sept. Partly cloudy
Partly cloudy
 17° /9° 0.6 mm 5
Next
Important Notice
Our weather forecast for Sankt 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 Sankt Gallen forecast closer to your planned date for the most up-to-date weather information.
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Sankt Gallen in September - FAQ

What are the expected maximum and minimum temperatures in Sankt 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 Sankt Gallen during September?
Significant rainfall exceeding 127 mm is expected in Sankt 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 Sankt Gallen during September?
The average wind speed in Sankt Gallen during September is 9 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Sankt Gallen

Explore the daily rainfall trends and prepare for Sankt Gallens September weather 💧

UV exposure in Sankt Gallen during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Sankt Gallen?

Get accurate weather forecasts for Sankt Gallen, located at latitude 47.424 and longitude 9.375. Stay updated with localized weather information tailored for Sankt Gallen.

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