Rennes is typically chill in December.

Maximum temperatures go down compared to the previous month from +54°F to +48°F. The minimum temperature also goes down from +43°F to +39°F.

Pack a jumper and a jacket as there will be cooler temperatures.

December is one of the coolest months in Rennes, here is the comparison with other months:

December weather is still as ok as in November. It’s getting colder in December. From +54°F in the day, the average maximum temperature lowers to +48°F. Prepare for more rain. Average rainfall goes from 56 mm to 61 mm. Humidity rises from 86% to 87%. The average wind speed doesn’t change much during December, staying around 3 m/s. The amount of sunny days stay about the same, averaging 3 sunny days during the month.

January brings much the same weather, it remains ok.

The climate in Rennes in December has not changed that much over the last 43 years.

The average temperature was the lowest in 1986 (+57°F) and the highest in 2022 (+64°F). The driest year was 1996 with only 390 mm of rainfall, and the wettest year was 2000 with 878 mm.

For this page, we’ve looked at the typical weather in Rennes, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.