The highest day temperature in August 2026 was 90°F. The lowest night temperature was 34°F. The average values for day and night temperatures during August were 76.0°F и 63.7°F respectivly.

The average sea surface temperature in August 2026 for St Gallen was 78.4°F. The maximum and minimum values were 75.2°F and 80.6°F respectively.

Most of the days in August are sunny but you can also expect cloudy and gloomy days.

Precipitation total in August for St Gallen is 4.7 in. It makes august one of the most rainy months of the year.

The average wind speed in August is 4.0 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for St Gallen in August is 9.0 hours.