The highest day temperature in September 2026 was 74°F. The lowest night temperature was 61°F. The average values for day and night temperatures during September were 66.9°F и 64.6°F respectivly.

The average sea surface temperature in September 2026 for Saint Malo was 69.5°F. The maximum and minimum values were 68.0°F and 71.2°F respectively.

You can expect various weather conditions during September. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in September for Saint Malo is 1.6 in. It makes september one of the least rainy months of the year.

The average wind speed in September is 11.0 mph. It makes September one of the most windless months of the year for Saint Malo.

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 Saint Malo in September is 7.1 hours.