The temperatures in Carnac in December are quite cold with temperatures between 7°C and 11°C, warm clothes are a must.
You can expect rain for roughly half of the month of December in Carnac. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Carnac in December 2025.
If you’re planning to visit Carnac in the near future, we highly recommend that you review the 14 day weather forecast for Carnac before you arrive.
Temperatures
11° / 7°
Rainy Days
9
Snowy Days
0
Dry Days
21
Rainfall
144
mm
Sun Hours
8.3
Hrs