Koosharem Reservoir Weather Forecast

    • 40
    • 70

    Increasing Clouds

    • 41
    • 66

    Chance Rain Showers

    • 45
    • 75

    Mostly Sunny

    • 47
    • 78

    Partly Sunny

    • 46
    • 78

    Slight Chance Thunderstorms

    • 43
    • 75

    Breezy

Today 21 May Upper Sevier River Valleys

Sunny. Highs in the lower 70s. Northwest Winds 10 to 20 Mph in the afternoon.

Tonight 21 May Upper Sevier River Valleys

Mostly clear. Lows in the upper 30s. Northwest Winds 10 to 20 Mph in the evening.

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Koosharem Reservoir Temperature Statistics

May Temperature

Bryce Canyon Airport (64 miles)

  • Lowest 19 May, 2026

    18 °F

  • Average May

    51.2 °F

  • Highest 11 May, 2026

    78.1 °F

Climate (2021–Present)

Bryce Canyon Airport (64 miles)

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  • Average Low 2021–2026

    28.6 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    58.9 °F
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