St George Weather Forecast

    • 71
    • 89

    Chance Rain Showers

    • 68
    • 91

    Slight Chance Thunderstorms

    • 65
    • 92

    Mostly Sunny

    • 67
    • 93

    Partly Sunny

    • 67
    • 93

    Partly Sunny

    • 66
    • 92

    Mostly Sunny

Today 17 Sep Lower Washington County

Partly sunny with a chance of rain Showers and a slight chance of Thunderstorms in the Morning, then sunny with a slight chance of Showers and Thunderstorms in the afternoon. Highs around 90. Chance of precipitation 40 percent.

Tonight 17 Sep Lower Washington County

Mostly clear. Lows around 70.

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St George Temperature Statistics

September Temperature

St George Municipal Airport (5 miles)

  • Lowest 7 September, 2026

    62.1 °F

  • Average September

    83.7 °F

  • Highest 10 September, 2026

    102.9 °F

Climate (2021–2026)

St George Municipal Airport (5 miles)

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  • Average Low 2021–2026

    53 °F

  • Average 2021–2026

    64.8 °F

  • Average High 2021–2026

    76.8 °F
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