Cornwall (St Ives)
December
Weather in Cornwall for December 2026
Your guide to Cornwall weather in December - trends and predictions
Cornwall in December brings notable rainfall, with an average of 16 rainy days and a total precipitation of 116.6 mm.
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15
Dry days
16
Rainy days
0
Snow days
10°/8°
Temperatures
40 km/h
Avg max wind
81 %
Avg humidity
Cornwall Weather December
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Temperatures trend during December in Cornwall
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December weather in Cornwall day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Dec. |  Moderate rain | 13° /10° | 10.6 mm | 0.7 | |
| 2 Dec. |  Light rain | 10° /8° | 3.6 mm | 0.7 | |
| 3 Dec. | Light rain | 10° /8° | 4.8 mm | 0.7 | |
| 4 Dec. | Light rain | 11° /9° | 4.8 mm | 0.7 | |
| 5 Dec. | Light rain | 13° /10° | 8 mm | 0.7 | |
| 6 Dec. | Light rain | 12° /9° | 4.2 mm | 0.6 | |
| 7 Dec. | Light rain | 12° /10° | 5.4 mm | 0.6 | |
| 8 Dec. | Light rain | 11° /10° | 3.8 mm | 0.6 | |
| 9 Dec. | Light rain | 11° /9° | 3.5 mm | 0.6 | |
| 10 Dec. |  Patchy rain possible | 10° /8° | 0.2 mm | 0.6 | |
| 11 Dec. | Patchy rain possible | 10° /8° | 1.6 mm | 0.6 | |
| 12 Dec. | Patchy rain possible | 10° /8° | 0.3 mm | 0.6 | |
| 13 Dec. | Light rain shower | 10° /8° | 1.6 mm | 0.6 | |
| 14 Dec. | Light rain shower | 11° /9° | 0.8 mm | 0.6 | |
| 15 Dec. | Moderate rain | 11° /10° | 13.8 mm | 0.6 | |
| 16 Dec. | Patchy rain possible | 10° /9° | 0.3 mm | 0.6 | |
| 17 Dec. | Moderate rain | 12° /10° | 14.6 mm | 0.6 | |
| 18 Dec. |  Moderate or heavy rain with thunder | 12° /9° | 17.2 mm | 0.6 | |
| 19 Dec. | Light rain shower | 9° /9° | 2.3 mm | 0.6 | |
| 20 Dec. | Light rain | 11° /8° | 4 mm | 0.6 | |
| 21 Dec. | Light rain | 10° /8° | 6.5 mm | 0.6 | |
| 22 Dec. | Light rain | 10° /8° | 3 mm | 0.6 | |
| 23 Dec. | Light drizzle | 11° /7° | 1 mm | 0.6 | |
| 24 Dec. | Patchy rain possible | 9° /7° | 0.1 mm | 0.6 | |
| 25 Dec. | Patchy rain possible | 9° /7° | 0.1 mm | 0.6 | |
| 26 Dec. | Patchy rain possible | 9° /7° | 0.1 mm | 0.6 | |
| 27 Dec. | Patchy rain possible | 10° /7° | 0.1 mm | 0.6 | |
| 28 Dec. | Patchy rain possible | 10° /6° | 0.1 mm | 0.6 | |
| 29 Dec. |  Mist | 8° /6° | 0 mm | 0.6 | |
| 30 Dec. | Patchy rain possible | 9° /6° | 0.1 mm | 0.6 | |
| 31 Dec. | Patchy rain possible | 9° /7° | 0.2 mm | 0.6 | |
| 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?
Significant rainfall exceeding 116.6 mm is expected in Cornwall during December, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Cornwall during December?
The average wind speed in Cornwall during December is 40 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 10.9 °C. At the beginning of December temperatures are around 10.8 °C; by the end of the month they stay fairly steady and reach 11 °C.
- What is the water temperature in Cornwall in December?
- The average water temperature in Cornwall in December is 10.9 °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 16 rainy days in December with a total of 116.6 mm of rainfall.
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