Charleston 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 – October
What is the weather like in Charleston in December?
In December, Charleston is mild: daytime highs average 16 °C, and nights cool down to about 9 °C. The sea averages 17.2 °C – bracing, so a wetsuit helps for longer swims. Expect around 5 hours of sunshine a day. Rain falls on about 8 days, adding up to 88 mm. All in all, December is not an ideal month for a holiday in Charleston.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 37 | 22 | 22 |
| Day | 19° | 16° | 14° |
| Night | 12° | 9° | 7° |
| Sea | 20° | 17° | 15° |
| Sun | 6 h | 5 h | 5 h |
| Rain days | 7 | 8 | 8 |
More details for December
- Daylight
- 10 h 1 min07:14 – 17:15
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 53 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC−5America/New_York
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %3 %
- Sunshineweight 20 %33 %
- Few rainy daysweight 20 %74 %
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
Charleston in December: quick answers
Is Charleston hot in December?
No. In December, Charleston is mild: daytime highs average 16 °C and nights drop to about 9 °C.
Can you swim in Charleston in December?
Only if you don't mind cold water: in December the sea averages just 17.2 °C. Comfortable swimming is possible from May to October.
Does it rain much in Charleston in December?
Rain falls on about 8 days, adding up to 88 mm.
Charleston month by month
The whole year in CharlestonAll destinations: USAWhere 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