The highest day temperature in January 2026 was 54°F. The lowest night temperature was 26°F. The average values for day and night temperatures during January were 46.5°F и 39.8°F respectivly.

The average sea surface temperature in January 2026 for Rennes was 47.4°F. The maximum and minimum values were 46.2°F and 48.4°F respectively.

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

Precipitation total in January for Rennes is 1.7 in.

The average wind speed in January is 10.5 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 Rennes in January is 3.5 hours.