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Winterthur
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Switzerland weather

Weather in Winterthur for September 2025

Your guide to Winterthur weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Winterthur is cooler than usual, with temperatures averaging 19.4 °C, this is -3.2 °C below the typical seasonal average.

  • The forecast for the next days in Winterthur predicts temperatures to be around 21 °C, close to the historical average.

  • In general, the average temperature in Winterthur at the beginning of September is 24.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.3 °C by the end of September.

    • Rain 🌧️

  • Winterthur in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 97.1 mm.

Average dry days
11
Dry days
Average rainy days
19
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/10°
Temperatures
Average wind speed
10 km/h
Avg max wind
Average humidity
81 %
Avg humidity

Winterthur Weather September

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

Temperatures trend during September in Winterthur

See the weather trend as well as the moving average line

September weather in Winterthur day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 25° /12° 1.7 mm 6
2 Sept. Sunny
Sunny
 24° /12° 1.9 mm 6
3 Sept. Mist
Mist
 25° /12° 3.9 mm 6
4 Sept. Fog
Fog
 24° /13° 7.9 mm 5
5 Sept. Mist
Mist
 22° /11° 2.3 mm 5
6 Sept. Fog
Fog
 23° /10° 0 mm 5
7 Sept. Fog
Fog
 26° /11° 0 mm 6
8 Sept. Fog
Fog
 25° /13° 3.5 mm 5
9 Sept. Light rain shower
Light rain shower
 21° /13° 6.7 mm 5
10 Sept. Mist
Mist
 21° /11° 1.7 mm 5
11 Sept. Partly cloudy
Partly cloudy
 21° /11° 4.5 mm 5
12 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 19° /9° 1.7 mm 4
13 Sept. Fog
Fog
 17° /8° 5.4 mm 4
14 Sept. Fog
Fog
 14° /9° 2 mm 4
15 Sept. Moderate rain
Moderate rain
 23° /13° 5.4 mm 1.2
16 Sept. Patchy rain possible
Patchy rain possible
 17° /10° 0.2 mm 0.7
17 Sept. Partly cloudy
Partly cloudy
 19° /9° 0 mm 0.4
18 Sept. Sunny
Sunny
 24° /10° 0 mm 1.4
19 Sept. Sunny
Sunny
 25° /11° 0 mm 4
20 Sept. Sunny
Sunny
 26° /11° 0 mm 5
21 Sept. Sunny
Sunny
 24° /13° 0 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 19° /12° 0.1 mm 4
23 Sept. Moderate rain
Moderate rain
 21° /12° 6.4 mm 3
24 Sept. Overcast
Overcast
 19° /12° 0 mm 3
25 Sept. Partly cloudy
Partly cloudy
 20° /11° 0 mm 4
26 Sept. Patchy rain possible
Patchy rain possible
 15° /10° 3.6 mm 3
27 Sept. Fog
Fog
 18° /9° 0 mm 3
28 Sept. Overcast
Overcast
 17° /8° 4.3 mm 4
29 Sept. Partly cloudy
Partly cloudy
 20° /7° 0 mm 5
30 Sept. Mist
Mist
 19° /8° 0.5 mm 5
Next
Important Notice
Our weather forecast for Winterthur 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 Winterthur forecast closer to your planned date for the most up-to-date weather information.
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Winterthur in September - FAQ

What are the expected maximum and minimum temperatures in Winterthur during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Winterthur during September?
Moderate rainfall is anticipated in Winterthur during September, with a total of 97.1 mm spread over approximately 19 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Winterthur during September?
The average wind speed in Winterthur during September is 10 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Winterthur

Explore the daily rainfall trends and prepare for Winterthurs September weather 💧

UV exposure in Winterthur during September

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

Quick links

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Location coordinates Where is Winterthur?

Get accurate weather forecasts for Winterthur, located at latitude 47.506 and longitude 8.724. Stay updated with localized weather information tailored for Winterthur.

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