The temperatures in Lannion in December are quite cold with temperatures between 7°C and 10°C, warm clothes are a must.
You can expect rain for roughly half of the month of December in Lannion. 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.
Please note that Lannion can expect a few days of snow in December.
Our weather forecast can give you a great sense of what weather to expect in Lannion in December 2025.
If you’re planning to visit Lannion in the near future, we highly recommend that you review the 14 day weather forecast for Lannion before you arrive.
Temperatures
10° / 7°
Rainy Days
10
Snowy Days
1
Dry Days
20
Rainfall
160
mm
Sun Hours
7.2
Hrs