Rennes, where it's located

The climate of Rennes is oceanic, with quite mild, rainy winters and warm summers.
The city is located in north-western France, in the eastern part of Brittany, of which it is the capital.
The average temperature of the coldest month (January) is of 5.9 °C (43 °F), that of the warmest month (July) is of 19.2 °C (66 °F). Here are the average temperatures.
Rennes - Average temperatures
Min (°C)3346912141411963
Max (°C)9101315192224242217129
Min (°F)373739434854575752484337
Max (°F)485055596672757572635448

Precipitation amounts to 695 millimeters (27.4 inches) per year: so, it is at an intermediate level. It ranges from 40 mm (1.6 in) in the driest month (August) to 75 mm (3 in) in the wettest ones (October, December). Here is the average precipitation.
Rennes - Average precipitation

On average, there are around 1,720 sunshine hours per year. Here are the average sunshine hours per day.
Rennes - Sunshine


Best Time

The best time to visit Rennes runs from mid-May to mid-September, since it is the warmest and sunniest period of the year. Sometimes, it can be hot in July and August, while in other circumstances, nights can be cool or even a little cold even in these months, so it can be useful to bring a sweatshirt or sweater and a light jacket for the evening.