Williston Weather Forecast

    • 54
    • 76

    Decreasing Clouds

    • 59
    • 81

    Partly Sunny

    • 49
    • 80

    Sunny

    • 56
    • 81

    Mostly Sunny

    • 62
    • 88

    Mostly Sunny

    • 65
    • 91

    Slight Chance Thunderstorms

Today 12 May Barnwell

Mostly cloudy. Highs in the mid 70s. East Winds 5 to 10 Mph.

Tonight 12 May Barnwell

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the mid 50s. East Winds around 5 Mph.

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Williston Temperature Statistics

May Temperature

Barnwell Regional Airport (9.9 miles)

  • Lowest 4 May, 2026

    46.4 °F

  • Average May

    65.7 °F

  • Highest 6 May, 2026

    89.6 °F

Climate (2021–Present)

Barnwell Regional Airport (9.9 miles)

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  • Average Low 2021–2026

    54.4 °F

  • Average 2021–2026

    64.9 °F

  • Average High 2021–2026

    76.7 °F
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