Williston Weather Forecast

    • 77
    • 97

    Hot

    • 73
    • 96

    Mostly Sunny

    • 74
    • 96

    Mostly Sunny

    • 74
    • 98

    Hot

    • 73
    • 97

    Chance Thunderstorms

    • 72
    • 92

    Rain Showers Likely

Today 17 Aug Barnwell

Sunny with a slight chance of Showers and Thunderstorms. Near steady temperature in the upper 90s. West Winds around 5 Mph. Chance of rain 20 percent. Heat index Values up to 109.

Tonight 17 Aug Barnwell

Mostly clear. Lows in the upper 70s. Southwest Winds around 5 Mph.

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Williston Temperature Statistics

August Temperature

Barnwell Regional Airport (9.9 miles)

  • Lowest 7 August, 2026

    71.6 °F

  • Average August

    80 °F

  • Highest 13 August, 2026

    98.6 °F

Climate (2021–2026)

Barnwell Regional Airport (9.9 miles)

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  • Average Low 2021–2026

    54.5 °F

  • Average 2021–2026

    65.1 °F

  • Average High 2021–2026

    76.8 °F
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