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Weather in Saint Gallen for September 2025

Your guide to Saint Gallen weather in September - trends and predictions
  • In general, the average temperature in Saint Gallen at the beginning of September is 22.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.1 °C by the end of September.

  • Saint Gallen sees moderate rainfall in September, averaging 8 rainy days.

  • Is September a good time to visit Saint Gallen? check out the best time to travel to Saint Gallen page.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/12°
Temperatures
Average wind speed
8 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Saint Gallen in September average weather

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Temperatures trend during September in Saint Gallen

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
23° /13° 0.7 mm 6
2 Sept. Sunny
Sunny
23° /13° 2.6 mm 6
3 Sept. Sunny
Sunny
23° /13° 3.9 mm 6
4 Sept. Partly cloudy
Partly cloudy
22° /13° 2.3 mm 6
5 Sept. Sunny
Sunny
23° /12° 1.6 mm 6
6 Sept. Sunny
Sunny
22° /12° 0 mm 6
7 Sept. Sunny
Sunny
23° /12° 0 mm 6
8 Sept. Sunny
Sunny
23° /14° 7.5 mm 6
9 Sept. Partly cloudy
Partly cloudy
20° /14° 12.4 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
21° /13° 1.3 mm 5
11 Sept. Sunny
Sunny
21° /12° 6.5 mm 6
12 Sept. Thundery outbreaks possible
Thundery outbreaks possible
17° /10° 5.5 mm 4
13 Sept. Mist
Mist
13° /9° 6.7 mm 3
14 Sept. Mist
Mist
12° /8° 4.5 mm 3
15 Sept. Mist
Mist
17° /6° 0 mm 5
16 Sept. Partly cloudy
Partly cloudy
17° /7° 2 mm 5
17 Sept. Sunny
Sunny
18° /10° 3.4 mm 5
18 Sept. Light rain shower
Light rain shower
18° /9° 10.1 mm 5
19 Sept. Light rain shower
Light rain shower
17° /10° 2.9 mm 4
20 Sept. Patchy rain possible
Patchy rain possible
19° /9° 0.9 mm 5
21 Sept. Partly cloudy
Partly cloudy
20° /10° 0.4 mm 5
22 Sept. Light rain shower
Light rain shower
16° /9° 15.9 mm 4
23 Sept. Patchy rain possible
Patchy rain possible
15° /8° 9.5 mm 4
24 Sept. Sunny
Sunny
16° /7° 1.4 mm 5
25 Sept. Sunny
Sunny
16° /6° 0 mm 5
26 Sept. Sunny
Sunny
16° /9° 5.4 mm 4
27 Sept. Sunny
Sunny
16° /9° 9 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
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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.

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 21° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Saint Gallen during September?
Moderate rainfall is anticipated in Saint Gallen during September, with a total of 64.2 mm spread over approximately 8 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Saint Gallen during September?
The average wind speed in Saint Gallen during September is 8 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Saint Gallen in September?

As you prepare for your trip to Saint Gallen in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Saint Gallen, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Warm Clothing: Sweaters, hoodies, long pants
    • Rain Gear: Lightweight, waterproof clothing
  • Footwear
    • Waterproof Shoes
  • Accessories
    • Sunglasses: For sun protection
    • Sun Hats: Wide-brimmed hats for sun protection in warm weather
    • Scarves: To protect you from the cold wind
    • Gloves/Mittens: Essential for cold weather
    • Warm Hats: Warm hats for insulation in cold weather
    • Umbrellas/Raincoats: For rainy days

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 ☀️
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Location coordinates 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.

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