The highest day temperature in September 2025 was 66°F. The lowest night temperature was 37°F. The average values for day and night temperatures during September were 58.3°F и 51.1°F respectivly.

The average sea surface temperature in September 2025 for Sortavala was 58.8°F. The maximum and minimum values were 53.8°F and 62.2°F respectively.

Most of the days in September are gloomy but you can also expect sunny days.

Precipitation total in September for Sortavala is 2.2 in.

The average wind speed in September is 8.9 mph.

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 Sortavala in September is 6.1 hours.