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Weather in Cornwall for December 2025

Your guide to Cornwall weather in December - trends and predictions

    Temperatures

  • Until now, December 2025 in Cornwall has been nearly identical to the historical average, with a temperature of 11.2 °C (showing only a slight deviation of 0.5 °C).

  • The forecast for the next days in Cornwall predicts temperatures to be around 11 °C, close to the historical average.

  • In general, the average temperature in Cornwall at the beginning of December is 10.7 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 10.6 °C by the end of December.

    • Rain 🌧️

  • Cornwall experiences heavy rainfall in December, with over 20 rainy days and an average total precipitation 97.7 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
3
Dry days
Average rainy days
28
Rainy days
Average snowy days
0
Snow days
Average temperatures
10°/8°
Temperatures
Average wind speed
39 km/h
Avg max wind
Average humidity
82 %
Avg humidity

Cornwall Weather December

Move between months or click on a day
November
January
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Light rain shower
10°
2
Light rain shower
9°
3
Light rain shower
10°
4
Light rain shower
11°
5
Patchy rain possible
11°
6
Light rain shower
12°
7
Light rain shower
12°
8
Patchy rain possible
11°
9
Light rain shower
11°
10
Patchy rain possible
11°
11
Patchy rain possible
10°
12
Patchy rain possible
10°
13
Sunny
11°
14
Cloudy
12°
15
Heavy rain
11°
16
Patchy rain possible
10°
17
Patchy rain possible
11°
18
Moderate rain
12°
19
Patchy rain possible
11°
20
Patchy rain possible
11°
21
Patchy rain possible
12°
22
Patchy rain possible
12°
23
Patchy rain possible
10°
24
Patchy rain possible
12°
25
Patchy rain possible
12°
26
Patchy rain possible
9°
27
Moderate rain
11°
28
Light rain shower
11°
29
Patchy light drizzle
10°
30
Moderate rain
11°
31
Light rain shower
10°

Temperatures trend during December in Cornwall

See the weather trend as well as the moving average line

December weather in Cornwall day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
1 Dec. Light rain shower
Light rain shower
 10° /7° 7.3 mm 2
2 Dec. Light rain shower
Light rain shower
 9° /5° 3.1 mm 2
3 Dec. Light rain shower
Light rain shower
 10° /6° 8.3 mm 3
4 Dec. Light rain shower
Light rain shower
 11° /7° 5.6 mm 3
5 Dec. Patchy rain possible
Patchy rain possible
 11° /8° 5.8 mm 3
6 Dec. Light rain shower
Light rain shower
 12° /8° 3 mm 3
7 Dec. Light rain shower
Light rain shower
 12° /9° 8.3 mm 3
8 Dec. Patchy rain possible
Patchy rain possible
 11° /9° 3 mm 3
9 Dec. Light rain shower
Light rain shower
 11° /8° 5.5 mm 3
10 Dec. Patchy rain possible
Patchy rain possible
 11° /7° 3.4 mm 3
11 Dec. Patchy rain possible
Patchy rain possible
 10° /7° 1.2 mm 3
12 Dec. Patchy rain possible
Patchy rain possible
 10° /7° 2.1 mm 3
13 Dec. Sunny
Sunny
 11° /8° 0 mm 0.1
14 Dec. Cloudy
Cloudy
 12° /10° 0.1 mm 0.1
15 Dec. Heavy rain
Heavy rain
 11° /9° 27.9 mm 0
16 Dec. Patchy rain possible
Patchy rain possible
 10° /8° 0.2 mm 0.1
17 Dec. Patchy rain possible
Patchy rain possible
 11° /7° 2 mm 0
18 Dec. Moderate rain
Moderate rain
 12° /10° 8.9 mm 3
19 Dec. Patchy rain possible
Patchy rain possible
 11° /10° 1.1 mm 3
20 Dec. Patchy rain possible
Patchy rain possible
 11° /8° 0.3 mm 2
21 Dec. Patchy rain possible
Patchy rain possible
 12° /11° 1 mm 3
22 Dec. Patchy rain possible
Patchy rain possible
 12° /11° 0.2 mm 3
23 Dec. Patchy rain possible
Patchy rain possible
 10° /9° 1 mm 2
24 Dec. Patchy rain possible
Patchy rain possible
 12° /12° 1.1 mm 3
25 Dec. Patchy rain possible
Patchy rain possible
 12° /8° 0.5 mm 3
26 Dec. Patchy rain possible
Patchy rain possible
 9° /8° 0.2 mm 2
27 Dec. Moderate rain
Moderate rain
 11° /9° 4.7 mm 3
28 Dec. Light rain shower
Light rain shower
 11° /8° 2.1 mm 3
29 Dec. Patchy light drizzle
Patchy light drizzle
 10° /8° 2.2 mm 4
30 Dec. Moderate rain
Moderate rain
 11° /7° 4.4 mm 3
31 Dec. Light rain shower
Light rain shower
 10° /7° 4.2 mm 3
Next
Important Notice
Our weather forecast for Cornwall in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Cornwall forecast closer to your planned date for the most up-to-date weather information.
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Cornwall in December - FAQ

What are the expected maximum and minimum temperatures in Cornwall during December?
During December, expect a variety of temperatures with highs around 10° and lows near 8°, suitable for diverse activities and preferences.
How much rainfall should be expected in Cornwall during December?
Moderate rainfall is anticipated in Cornwall during December, with a total of 97.7 mm spread over approximately 28 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Cornwall during December?
The average wind speed in Cornwall during December is 39 km/h, suggesting breezy to windy conditions, depending on your activities.

Cornwall water temperatures in December

The average water temperature of the Atlantic Ocean near Cornwall in December is 10.8 °C. Temperatures remain fairly consistent throughout the month.

What is the water temperature in Cornwall in December?
The average water temperature in Cornwall in December is 10.8 °C.
Can you swim in Cornwall in December?
Dangerously cold water: hypothermia risk is high. Only experienced cold-water swimmers with proper gear should consider entering.

December rainfall patterns in Cornwall

Explore the daily rainfall trends and prepare for Cornwalls December weather 💧
Typically, Cornwall has 28 rainy days in December with a total of 97.7 mm of rainfall.
Top locations in Cornwall
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FalmouthLooeNewquayPenzancePerranporthSt AustellSt IvesTruro
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Location coordinates Where is Cornwall?

Get accurate weather forecasts for Cornwall, located at latitude 50.416 and longitude -5.073. Stay updated with localized weather information tailored for Cornwall.

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