The temperatures in Castelldefels in December are quite cold with temperatures between 9°C and 14°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Castelldefels during the month of December. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Castelldefels in December 2025.
If you’re planning to visit Castelldefels in the near future, we highly recommend that you review the 14 day weather forecast for Castelldefels before you arrive.
Temperatures
14° / 9°
Rainy Days
3
Snowy Days
0
Dry Days
28
Rainfall
28
mm
Sun Hours
8.4
Hrs