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Rennes — weather by month, water temperature

The air temperature by month
The average maximum daily temperature — 22.2°C in July. Average maximum night temperature — 13.8°C in August. The average minimum daily temperature — 7.4°C in January. The average minimum night temperature — 3.5°C in February.
The water temperature by month
Average maximum temperature of the water — 18.4°C fixed in August. The average minimum temperature of the water — 8.2°C fixed in February.
Precipitation, mm
Maximum precipitation — 59.2 mm It was recorded in May. Minimum precipitation — 25.8 mm It was recorded in September.
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