Climate averages 1991–2020
Winterthur weather
in September.
A mild, wet month: the 4th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Winterthur: daytime highs average 18.7°C and nights cool to about 10.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 91 mm of rain on roughly 11 days, which makes September a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 37 min on an average September day.
The nearest other city in this atlas is Zürich (20 km away). In September its highs average 18.9°C, about as warm as Winterthur, with 123 mm of rain.
Among the 8 cities listed in Switzerland, Winterthur ranks 6th of 8 for the warmest September highs and 2nd of 8 for the driest September (rainfall, lowest first). The mean September high of those 8 cities is 18.8°C; Winterthur is level with that mean.
From September to October, average highs fall by 4.3°C to 14.4°C, and monthly rainfall falls from 91 mm to 83 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Winterthur climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.5°C-1.9°C | -1.9°C | 79 | 12.3 | 8.99 h |
| February | 5.8°C-2.0°C | -2.0°C | 69 | 11.3 | 10.210 h |
| March | 9.9°C0.8°C | 0.8°C | 82 | 13.2 | 11.912 h |
| April | 13.8°C4.0°C | 4.0°C | 85 | 12.5 | 13.614 h |
| May | 17.6°C8.5°C | 8.5°C | 119 | 15.2 | 15.115 h |
| June | 21.2°C12.3°C | 12.3°C | 113 | 14.8 | 15.916 h |
| July | 23.1°C14.4°C | 14.4°C | 106 | 13.7 | 15.616 h |
| August | 23.1°C14.6°C | 14.6°C | 107 | 13.0 | 14.314 h |
| September, selected | 18.7°C10.8°C | 10.8°C | 91 | 11.1 | 12.613 h |
| October | 14.4°C6.9°C | 6.9°C | 83 | 11.6 | 10.911 h |
| November | 8.6°C2.2°C | 2.2°C | 87 | 12.1 | 9.49 h |
| December | 4.9°C-0.9°C | -0.9°C | 93 | 13.7 | 8.59 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Zürich in SeptemberSwitzerland · 20 kmHigh 18.9°C · Low 11.2°C · 123 mm rain
- Konstanz in SeptemberGermany · 38 kmHigh 18.8°C · Low 12.9°C · 94 mm rain
- Sankt Gallen in SeptemberSwitzerland · 50 kmHigh 17.2°C · Low 9.2°C · 127 mm rain
- Luzern in SeptemberSwitzerland · 60 kmHigh 18.9°C · Low 11.6°C · 166 mm rain
- Villingen-Schwenningen in SeptemberGermany · 64 kmHigh 16.9°C · Low 8.9°C · 93 mm rain
- Vaduz in SeptemberLiechtenstein · 72 kmHigh 19.1°C · Low 10.5°C · 154 mm rain
- Freiburg in SeptemberGermany · 85 kmHigh 20.0°C · Low 11.8°C · 77 mm rain
- Basel in SeptemberSwitzerland · 87 kmHigh 20.1°C · Low 10.8°C · 95 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Winterthur) is explained once on the Winterthur year overview and on the Sources, method and limits page.