Summerville, SC sits in the humid subtropical belt of the South Atlantic, so summers run warm and humid and winters tend to be short and mild.6, 5 Rain falls throughout the year, with a noticeable lift in storm activity during the warmer months.5, 4
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Last Updated: 02/24/2026 8:41 pm
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Summerville, South Carolina town hall
Spring often warms up quickly, and humidity returns early, so sunshine and passing showers often trade places over a single day.5 Fall usually brings a slower cool-down, with more comfortable stretches once the strongest summer heat breaks.5
Summer brings the steadiest heat, and thunderstorms become a regular part of the pattern across the Lowcountry.6, 2 In and around Summerville, the sea breeze often plays a role in late-day clouds, showers, and storm development.2, 5 From June through November, Atlantic hurricane season adds another layer of uncertainty, and tropical systems sometimes bring heavy rain and gusty conditions well inland.1, 6 Winter weather usually stays moderate, though occasional cold snaps and a few frosty mornings still show up from time to time.6