You
will find the weather in Brittany milder and warmer than in Britain. The
climate is very similar to Cornwall or that of southern Ireland, but being further south
it can often be much better.
Average Temperatures
One final aspect to note, is that overall, annual temperatures do not peak or dip significantly. The summers are hot but not intense, and the winters are extremely mild with only occasional frosts.
For more information and to check current weather try these links: