The highest day temperature in August 2025 was 98°F. The lowest night temperature was 44°F. The average values for day and night temperatures during August were 82.6°F и 54.0°F respectivly.

The average sea surface temperature in August 2025 for Annecy was 74.3°F. The maximum and minimum values were 70.2°F and 77.8°F respectively.

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

Precipitation total in August for Annecy is 3.1 in. It makes august one of the least rainy months of the year.

The average wind speed in August is 3.4 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 Annecy in August is 10.3 hours.