The temperatures in St Austell in December are quite cold with temperatures between 8°C and 10°C, warm clothes are a must.
You can expect rain for roughly half of the month of December in St Austell. 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 St Austell in December 2025.
If you’re planning to visit St Austell in the near future, we highly recommend that you review the 14 day weather forecast for St Austell before you arrive.
Temperatures
10° / 8°
Rainy Days
10
Snowy Days
0
Dry Days
20
Rainfall
155
mm
Sun Hours
7.0
Hrs
