The highest day temperature in July 2026 was 104°F. The lowest night temperature was 53°F. The average values for day and night temperatures during July were 89.0°F и 60.1°F respectivly.

The average sea surface temperature in July 2026 for Rennes was 69.1°F. The maximum and minimum values were 66.6°F and 71.0°F respectively.

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

Precipitation total in July for Rennes is 1.3 in. It makes july one of the least rainy months of the year.

The average wind speed in July is 8.7 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 July is 9.3 hours.