Koosharem Reservoir Weather Forecast

    • 52
    • 79

    Increasing Clouds

    • 48
    • 76

    Chance Thunderstorms

    • 48
    • 75

    Chance Thunderstorms

    • 47
    • 76

    Slight Chance Thunderstorms

    • 45
    • 75

    Mostly Sunny

    • 48
    • 79

    Mostly Sunny

    • 50
    • 81

    Mostly Sunny

Today 18 Sep Upper Sevier River Valleys

Partly cloudy. Highs around 80.

Tonight 18 Sep Upper Sevier River Valleys

Mostly cloudy. A 20 percent chance of rain Showers after midnight. Lows in the upper 40s.

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Koosharem Reservoir Temperature Statistics

September Temperature

Bryce Canyon Airport (64 miles)

  • Lowest 16 September, 2025

    30.9 °F

  • Average September

    58.2 °F

  • Highest 1 September, 2025

    81 °F

Climate (2020–Present)

Bryce Canyon Airport (64 miles)

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  • Average Low 2020–2025

    28.4 °F

  • Average 2020–2025

    44.4 °F

  • Average High 2020–2025

    58.3 °F
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