Cornwall weather

Our guide to the weather in Cornwall during December

10

Average high

3

UV Index

158mm

Monthly rainfall

80%

Humidity

We've looked at the most up-to-date weather data for Cornwall, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Cornwall weather in December.

What's the temperature like in Cornwall during December?

The temperature is extremely stable in December with average highs of 10℃ and lows just 2℃ lower at 8℃. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.

Does it snow in Cornwall during December?

Possibly. There's a chance of snow during December but not as much as you might think. Check the local forecast before you leave home so that you can pack appropriate footwear and clothing.

Does it rain in Cornwall during December?

On average, there will be 11 rainy days during the month, amounting to 158.1mm in total. That's a significant amount of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. There's a small chance that you'll catch a thunderstorm during your trip.

Is it windy in Cornwall during December?

Expect moderate breeze becoming stronger at times during December, with occasional gusts up to 27mph. With cool air temperatures, any breeze will feel cold.

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Weather in Cornwall

Our month-by-month guide to the weather and climate in Cornwall

9.2

Cornwall weather in

January
9.0

Cornwall weather in

February
9.9

Cornwall weather in

March
11.4

Cornwall weather in

April
13.5

Cornwall weather in

May
16.1

Cornwall weather in

June
18.1

Cornwall weather in

July
18.2

Cornwall weather in

August
16.9

Cornwall weather in

September
14.8

Cornwall weather in

October
12.0

Cornwall weather in

November
10.3

Cornwall weather in

December