Sheridan Reservoir Weather Forecast

    • 40
    • 68

    Chance Rain Showers

    • 38
    • 58

    Rain Showers Likely

    • 40
    • 65

    Mostly Sunny

    • 43
    • 69

    Sunny

    • 45
    • 71

    Mostly Sunny

    • 44
    • 70

    Chance Rain Showers

Today 14 Sep Centennial Mountains/Island Park

Mostly sunny. Highs 65 to 72.

Tonight 14 Sep Centennial Mountains/Island Park

Mostly cloudy. A slight chance of Showers and Thunderstorms in the evening. Then a chance of rain Showers after midnight. Lows 36 to 46.

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  • Temperature Real-Time

Sheridan Reservoir Temperature Statistics

September Temperature

West Yellowstone (32.3 miles)

  • Lowest 6 September, 2025

    28.4 °F

  • Average September

    55 °F

  • Highest 3 September, 2025

    82.4 °F

Climate (2020–Present)

West Yellowstone (32.3 miles)

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  • Average Low 2020–2025

    33.5 °F

  • Average 2020–2025

    50.8 °F

  • Average High 2020–2025

    66.1 °F
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