Rouen, where it's located

The climate of Rouen is generally cool and wet, rainy and windy all year round, but especially in autumn and winter.
The city is located in northern France, in Normandy, 50 km (30 miles) from the English Channel, and is crossed by the Seine.
The average temperature of the coldest month (January) is of 3.8 °C (39 °F), that of the warmest months (July, August) is of 17.8 °C (64 °F). Here are the average temperatures.
Rouen - Average temperatures
Min (°C)1135811131310842
Max (°C)671114172023232015107
Min (°F)343437414652555550463936
Max (°F)434552576368737368595045

Precipitation amounts to 850 millimeters (33.5 inches) per year: so, it is at an intermediate level. It ranges from 60 mm (2.4 in) in the driest months (February, April) to 90 mm (3.5 in) in the wettest (December). Here is the average precipitation.
Rouen - Average precipitation

On average, there are around 1,560 sunshine hours per year. Here are the average sunshine hours per day.
Rouen - Sunshine

The sea temperature ranges between 8 °C (46 °F) and 18 °C (64 °F). So, it never becomes warm for swimming. Here are the average sea temperatures on the coast near Rouen, in Le Havre.
Le Havre - Sea temperature
Temp (°C)98891114161817161411
Temp (°F)484646485257616463615752


Best Time

The best time to visit Rouen runs from mid-May to mid-September, since it is the warmest and sunniest period of the year. Sometimes, 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.