The highest day temperature in September 2025 was 82°F. The lowest night temperature was 71°F. The average values for day and night temperatures during September were 77.1°F и 76.8°F respectivly.

The average sea surface temperature in September 2025 for Santorini was 78.7°F. The maximum and minimum values were 76.6°F and 80.4°F respectively.

Almost all days in September are sunny. There is very low probability of clouds or gloomy days.

Precipitation total in September for Santorini is 0.3 in.

The average wind speed in September is 14.3 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 Santorini in September is 11.5 hours.