Barnwell State Park Weather Forecast

    • 65
    • 89

    Mostly Sunny

    • 64
    • 89

    Mostly Sunny

    • 64
    • 89

    Mostly Sunny

    • 66
    • 87

    Partly Sunny

    • 67
    • 86

    Mostly Cloudy

    • 67
    • 88

    Slight Chance Thunderstorms

Today 18 Sep Barnwell

Sunny in the morning. Highs around 90. Light and variable Winds.

Tonight 18 Sep Barnwell

Partly cloudy in the Evening, then becoming mostly clear. Lows in the mid 60s. Light and variable Winds.

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Barnwell State Park Temperature Statistics

September Temperature

Barnwell Regional Airport (6.8 miles)

  • Lowest 15 September, 2025

    55.4 °F

  • Average September

    73.3 °F

  • Highest 5 September, 2025

    93.2 °F

Climate (2020–Present)

Barnwell Regional Airport (6.8 miles)

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  • Average Low 2020–2025

    54.5 °F

  • Average 2020–2025

    64.9 °F

  • Average High 2020–2025

    76.5 °F
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