Tongue River Reservoir State Park Weather Forecast

    • 21
    • 53

    Breezy

    • 31
    • 65

    Mostly Sunny

    • 37
    • 75

    Mostly Sunny

    • 33
    • 65

    Mostly Sunny

    • 37
    • 70

    Mostly Sunny

    • 37
    • 69

    Partly Sunny

Today 15 Oct Southern Big Horn

Decreasing Clouds. Highs in the lower 50s. Northwest Winds 10 to 20 Mph.

Tonight 15 Oct Southern Big Horn

Mostly clear. Lows in the upper 20s. West Winds 5 to 10 Mph in the evening shifting to the southeast overnight.

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Tongue River Reservoir State Park Temperature Statistics

October Temperature

Sheridan County Airport (25.5 miles)

  • Lowest 12 October, 2026

    34 °F

  • Average October

    56.3 °F

  • Highest 5 October, 2026

    92.6 °F

Climate (2021–2026)

Sheridan County Airport (25.5 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    47.7 °F

  • Average High 2021–2026

    62.2 °F
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