Sullivan's Island Weather Forecast
- 39
- 48
Mostly Sunny
- 44
- 59
Mostly Sunny
- 42
- 55
Mostly Sunny
- 48
- 58
Mostly Sunny
- 50
- 62
Mostly Sunny
- 36
- 62
Partly Sunny
Today 9 Dec Charleston
Mostly sunny. Highs in the upper 40s. North Winds 5 to 10 Mph.
Tonight 9 Dec Charleston
Mostly clear. Lows in the lower 30s, except in the mid 30s near the coast. Northwest Winds around 5 Mph.
Sullivan's Island Temperature Statistics
December Temperature
Mount Pleasant Regional-Faison Field (9.3 miles)
Lowest 4 December, 2025
35.6 °FAverage December
50 °FHighest 1 December, 2025
57.2 °F
Climate (2020–Present)
Mount Pleasant Regional-Faison Field (9.3 miles)
Average Low 2020–2025
58.3 °FAverage 2020–2025
66.3 °FAverage High 2020–2025
75.3 °F