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Fort Moultrie Quartermaster and Support Facilities Historic DistrictFort Moultrie Quartermaster and Support Facilities Historic District · Photo: Brian Stansberry · CC BY 3.0
Weather in Sullivan's Island, SC · National Weather Service + NOAA

Sullivan's Island has milder winters than most of South Carolina

Sullivan's Island has warm winters and warm summers, with plenty of rain. A typical July afternoon reaches 90°, a January night drops to 41°, and snow is almost unheard of. In November, a normal day reaches 68° and a normal night drops to 50°.

Winter 61°/43°Spring 74°/57°Summer 88°/74°Fall 77°/60°
Right now
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Loading conditions…
Sunrise 6:41 am · sunset 5:24 pm

Getting the latest forecast from the National Weather Service…

What stands out about Sullivan's Island’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
Milder winters than most of South CarolinaJanuary nights average 41°, milder than 470 of 475 South Carolina towns.A long growing season321 frost-free days, from Feb 4 to Dec 30.Snow is rareAbout 0.3 inches in a normal year, so most winters see none.Air-conditioning countryMore cooling degree days than 93% of U.S. towns.
A normal year

Where today sits in Sullivan's Island’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
61° / 43°
Snow is rare
Spring
74° / 57°
Last frost around Feb 4
Summer
88° / 74°
25 days reach 90° in a normal year
Fall now
77° / 60°
First frost around Dec 30
54 daysuntil the usual first frost (Dec 30)
Best months to be outside
MarAprMayOctNov
Highs of 62–84° and lows of 40° or more
How much snow does Sullivan's Island get?Almost none.When is it wettest?August, with 6.5 inches.Is it warmer than it used to be?+1.3° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in Sullivan's Island.

Town Square →
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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Sullivan's Island itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Charleston Intl Airport, SC (15 mi, snow) and Charleston City, SC (6 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.