Treasure Valley Park Weather Forecast

    • 64
    • 94

    Mostly Sunny

    • 64
    • 95

    Sunny

    • 64
    • 97

    Hot

    • 67
    • 93

    Chance Rain Showers

    • 67
    • 89

    Slight Chance Thunderstorms

    • 66
    • 90

    Slight Chance Thunderstorms

    • 67
    • 92

    Mostly Sunny

Today 15 Sep Lower Washington County

Sunny. Highs in the mid 90s.

Tonight 15 Sep Lower Washington County

Clear. Lows in the mid 60s.

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Treasure Valley Park Temperature Statistics

September Temperature

St George Municipal Airport (1.9 miles)

  • Lowest 12 September, 2025

    63 °F

  • Average September

    81.5 °F

  • Highest 1 September, 2025

    102 °F

Climate (2020–Present)

St George Municipal Airport (1.9 miles)

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  • Average Low 2020–2025

    52.3 °F

  • Average 2020–2025

    64.3 °F

  • Average High 2020–2025

    76.5 °F
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