Tongue River Reservoir State Park Weather Forecast

    • 43
    • 78

    Mostly Sunny

    • 52
    • 86

    Partly Sunny

    • 51
    • 86

    Mostly Sunny

    • 53
    • 86

    Slight Chance Rain Showers

    • 54
    • 85

    Mostly Cloudy

    • 51
    • 80

    Chance Rain Showers

Today 6 Sep Southern Big Horn

Sunny, warmer. Highs in the lower 80s. East Winds 5 to 10 Mph.

Tonight 6 Sep Southern Big Horn

Partly cloudy. Lows in the upper 40s. Southeast Winds 5 to 10 Mph.

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Tongue River Reservoir State Park Temperature Statistics

September Temperature

Sheridan County Airport (25.5 miles)

  • Lowest 1 September, 2025

    48 °F

  • Average September

    65.8 °F

  • Highest 1 September, 2025

    89.1 °F

Climate (2020–Present)

Sheridan County Airport (25.5 miles)

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  • Average Low 2020–2025

    33.1 °F

  • Average 2020–2025

    47 °F

  • Average High 2020–2025

    61.4 °F
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