The temperatures in Castro in December are quite cold with temperatures between 9°C and 16°C, warm clothes are a must.
You can expect rain for roughly half of the month of December in Castro. 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 Castro in December 2025.
If you’re planning to visit Castro in the near future, we highly recommend that you review the 14 day weather forecast for Castro before you arrive.
Temperatures
16° / 9°
Rainy Days
8
Snowy Days
0
Dry Days
23
Rainfall
151
mm
Sun Hours
8.0
Hrs
