Sullivan's Island Weather Forecast

    • 70
    • 82

    Mostly Sunny

    • 71
    • 82

    Mostly Sunny

    • 71
    • 81

    Slight Chance Thunderstorms

    • 71
    • 81

    Chance Rain Showers

    • 72
    • 81

    Slight Chance Thunderstorms

    • 73
    • 83

    Slight Chance Thunderstorms

Today 19 Sep Charleston

Patchy fog in the morning. Sunny. Highs in the mid 80s. North Winds around 5 Mph, becoming east in the afternoon.

Tonight 19 Sep Charleston

Mostly clear. Lows in the upper 60s. East Winds 5 to 10 Mph, becoming northeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sullivan's Island Temperature Statistics

September Temperature

Mount Pleasant Regional-Faison Field (9.3 miles)

  • Lowest 1 September, 2025

    62.6 °F

  • Average September

    73 °F

  • Highest 7 September, 2025

    89.6 °F

Climate (2020–Present)

Mount Pleasant Regional-Faison Field (9.3 miles)

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  • Average Low 2020–2025

    58.5 °F

  • Average 2020–2025

    66.5 °F

  • Average High 2020–2025

    75.4 °F
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