Isles of Scilly weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Poor
Best time to visit: May – August
What is the weather like in Isles of Scilly in December?
In December, Isles of Scilly is cool: daytime highs average 11 °C, and nights cool down to about 9 °C. The sea averages 11.6 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. It rains often – on about 17 days, adding up to 96 mm. It is often windy, with gusts of around 46 km/h. All in all, December is not an ideal month for a holiday in Isles of Scilly.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 2 | 2 | 3 |
| Day | 12° | 11° | 10° |
| Night | 11° | 9° | 8° |
| Sea | 13° | 12° | 11° |
| Sun | 2 h | 2 h | 2 h |
| Rain days | 16 | 17 | 16 |
More details for December
- Daylight
- 8 h 8 min08:16 – 16:24
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 46 km/haverage daily peakAll months
- Cloud cover
- 75 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+0Europe/London
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 20 %11 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in December
- A jumper for the evenings
- Rain jacket or umbrella
- Windproof jacket
Isles of Scilly in December: quick answers
Is Isles of Scilly hot in December?
No. In December, Isles of Scilly is cool: daytime highs average 11 °C and nights drop to about 9 °C.
Can you swim in Isles of Scilly in December?
Only if you don't mind cold water: in December the sea averages just 11.6 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Isles of Scilly in December?
It rains often – on about 17 days, adding up to 96 mm.
Isles of Scilly month by month
The whole year in Isles of ScillyAll destinations: United KingdomWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences