Climate averages 1991–2020
Sankt Gallen weather
in August.
A mild, wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Sankt Gallen: daytime highs average 21.2°C and nights cool to about 12.7°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 175 mm of rain on roughly 17 days, which makes August a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 16 min on an average August day.
The nearest other city in this atlas is Konstanz (30 km away). In August its highs average 23.3°C, 2.1°C warmer than Sankt Gallen, with 120 mm of rain.
Among the 8 cities listed in Switzerland, Sankt Gallen ranks 8th of 8 for the warmest August highs and 7th of 8 for the driest August (rainfall, lowest first). The mean August high of those 8 cities is 22.9°C; Sankt Gallen is 1.7°C cooler than that mean.
From August to September, average highs fall by 4.0°C to 17.2°C, and monthly rainfall falls from 175 mm to 127 mm.
The annual picture
August 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
Sankt Gallen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.8°C-4.8°C | -4.8°C | 88 | 12.7 | 8.99 h |
| February | 3.9°C-4.7°C | -4.7°C | 80 | 11.8 | 10.210 h |
| March | 7.8°C-1.4°C | -1.4°C | 100 | 14.8 | 11.912 h |
| April | 12.0°C2.1°C | 2.1°C | 102 | 14.5 | 13.614 h |
| May | 16.1°C7.0°C | 7.0°C | 155 | 17.2 | 15.115 h |
| June | 19.4°C10.7°C | 10.7°C | 172 | 17.4 | 15.916 h |
| July | 21.3°C12.6°C | 12.6°C | 174 | 17.5 | 15.516 h |
| August, selected | 21.2°C12.7°C | 12.7°C | 175 | 16.8 | 14.314 h |
| September | 17.2°C9.2°C | 9.2°C | 127 | 13.7 | 12.613 h |
| October | 13.4°C5.6°C | 5.6°C | 103 | 12.9 | 10.911 h |
| November | 7.5°C0.4°C | 0.4°C | 103 | 12.7 | 9.49 h |
| December | 3.4°C-3.5°C | -3.5°C | 105 | 14.1 | 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
August in nearby cities
- Konstanz in AugustGermany · 30 kmHigh 23.3°C · Low 16.8°C · 120 mm rain
- Vaduz in AugustLiechtenstein · 33 kmHigh 23.1°C · Low 13.9°C · 219 mm rain
- Winterthur in AugustSwitzerland · 50 kmHigh 23.1°C · Low 14.6°C · 107 mm rain
- Zürich in AugustSwitzerland · 62 kmHigh 23.2°C · Low 15.0°C · 147 mm rain
- Luzern in AugustSwitzerland · 91 kmHigh 23.0°C · Low 15.2°C · 211 mm rain
- Villingen-Schwenningen in AugustGermany · 97 kmHigh 21.2°C · Low 12.7°C · 124 mm rain
- Ulm in AugustGermany · 118 kmHigh 22.9°C · Low 13.9°C · 88 mm rain
- Reutlingen in AugustGermany · 119 kmHigh 23.5°C · Low 14.2°C · 75 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 Sankt Gallen) is explained once on the Sankt Gallen year overview and on the Sources, method and limits page.