Region: Bretagne (Brittany)

Rain: Brittany ( along with Normandy) is the rainiest region in France.  The far west coast is more rainy (43 inches a year) than inland (Rennes: 27.5 inches).  In rainy months (winter) it rains  between 7 - 12 days a month.  Even summer will have five rainy days a month.

Temperatures

• Winter are mild and temperatures are usually above freezing.  Brittany is less prone to cold and heat waves than the rest of France.
• Summers are cool, coolest on the west coast , and heat waves are shorter than in other regions. 'Normal' highs are in the 70's/ 80's (21/25 C) but even here temperatures have reached the 100's (40's C) for a few days in the past few summers

Sun: Brittany is the least sunny region of France (due to both latitude and climate). June, July and August are your best chances for sun.

Wind:  Brittany is windy .  Winds average 1 5 - 20 miles an hour, usually the frequent brisk breezes typical of westerlies and southwesterlies.  The wind here is less seasonal and less sporadic than the winds in the South of France (Mistral, Tramontine)   People who find their moods affected by the winds in the South may experience Brittany differently.  Windy, but not quite the "wind of madness" that the Mistral has been called.

References:  Climates to Travel , Weatherspark