Climate averages 1991–2020
Konstanz weather
in September.
A mild, wet month: the 4th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Konstanz: daytime highs average 18.8°C and nights cool to about 12.9°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 94 mm of rain on roughly 12 days, which makes September a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 38 min on an average September day.
The nearest other city in this atlas is Sankt Gallen (30 km away). In September its highs average 17.2°C, 1.6°C cooler than Konstanz, with 127 mm of rain.
Among the 120 cities listed in Germany, Konstanz ranks joint 59th of 120 for the warmest September highs and 120th of 120 for the driest September (rainfall, lowest first). The mean September high of those 120 cities is 18.8°C; Konstanz is level with that mean.
From September to October, average highs fall by 4.7°C to 14.1°C, and monthly rainfall falls from 94 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
Konstanz climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.6°C-1.2°C | -1.2°C | 71 | 12.0 | 8.99 h |
| February | 4.9°C-1.2°C | -1.2°C | 63 | 11.2 | 10.210 h |
| March | 8.9°C2.1°C | 2.1°C | 78 | 13.7 | 11.912 h |
| April | 13.6°C6.3°C | 6.3°C | 80 | 12.8 | 13.614 h |
| May | 18.0°C11.2°C | 11.2°C | 119 | 15.5 | 15.115 h |
| June | 21.5°C14.8°C | 14.8°C | 123 | 15.3 | 15.916 h |
| July | 23.4°C16.8°C | 16.8°C | 131 | 15.1 | 15.616 h |
| August | 23.3°C16.8°C | 16.8°C | 120 | 14.3 | 14.314 h |
| September, selected | 18.8°C12.9°C | 12.9°C | 94 | 12.2 | 12.613 h |
| October | 14.1°C8.6°C | 8.6°C | 83 | 11.8 | 10.911 h |
| November | 8.1°C3.8°C | 3.8°C | 83 | 12.1 | 9.49 h |
| December | 4.3°C0.4°C | 0.4°C | 85 | 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
- Sankt Gallen in SeptemberSwitzerland · 30 kmHigh 17.2°C · Low 9.2°C · 127 mm rain
- Winterthur in SeptemberSwitzerland · 38 kmHigh 18.7°C · Low 10.8°C · 91 mm rain
- Zürich in SeptemberSwitzerland · 57 kmHigh 18.9°C · Low 11.2°C · 123 mm rain
- Vaduz in SeptemberLiechtenstein · 63 kmHigh 19.1°C · Low 10.5°C · 154 mm rain
- Villingen-Schwenningen in SeptemberGermany · 68 kmHigh 16.9°C · Low 8.9°C · 93 mm rain
- Reutlingen in SeptemberGermany · 92 kmHigh 19.1°C · Low 10.3°C · 66 mm rain
- Luzern in SeptemberSwitzerland · 94 kmHigh 18.9°C · Low 11.6°C · 166 mm rain
- Tübingen in SeptemberGermany · 96 kmHigh 19.2°C · Low 10.4°C · 63 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 Konstanz) is explained once on the Konstanz year overview and on the Sources, method and limits page.