The temperatures in Castro Urdiales in December are quite cold with temperatures between 8°C and 12°C, warm clothes are a must.
You can expect rain for roughly half of the month of December in Castro Urdiales. 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 Castro Urdiales can expect a few days of snow in December.
Our weather forecast can give you a great sense of what weather to expect in Castro Urdiales in December 2025.
If you’re planning to visit Castro Urdiales in the near future, we highly recommend that you review the 14 day weather forecast for Castro Urdiales before you arrive.
Temperatures
12° / 8°
Rainy Days
8
Snowy Days
1
Dry Days
22
Rainfall
142
mm
Sun Hours
5.4
Hrs