Koosharem Reservoir Recreation Site Weather Forecast

    • 43
    • 61

    Mostly Cloudy

    • 37
    • 64

    Rain Showers

    • 28
    • 48

    Rain/Snow

    • 29
    • 45

    Slight Chance Thunderstorms

    • 39
    • 62

    Sunny

    • 44
    • 71

    Mostly Sunny

Today 16 May Central Mountains

Partly cloudy in the morning then becoming partly sunny. Highs in the mid 50s.

Tonight 16 May Central Mountains

Mostly cloudy. Lows in the upper 30s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Koosharem Reservoir Recreation Site Temperature Statistics

May Temperature

Delta, Delta Municipal Airport (62.1 miles)

  • Lowest 1 May, 2025

    35.6 °F

  • Average May

    58.7 °F

  • Highest 10 May, 2025

    86 °F

Climate (2020–Present)

Delta, Delta Municipal Airport (62.1 miles)

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  • Average Low 2020–2025

    39.4 °F

  • Average 2020–2025

    53.2 °F

  • Average High 2020–2025

    66.5 °F
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