Tongue River Reservoir State Park Weather Forecast

    • 45
    • 68

    Slight Chance Thunderstorms

    • 45
    • 74

    Mostly Sunny

    • 47
    • 75

    Chance Rain Showers

    • 46
    • 74

    Chance Rain Showers

    • 49
    • 78

    Mostly Sunny

    • 52
    • 82

    Slight Chance Thunderstorms

    • 53
    • 85

    Mostly Sunny

Today 25 May Southern Big Horn

Mostly sunny. Chance of Showers and slight chance of Thunderstorms early in the Afternoon, then slight chance of Showers and Thunderstorms late in the afternoon. Highs around 70. Southeast Winds 5 to 15 Mph. Chance of precipitation 30 percent.

Tonight 25 May Southern Big Horn

Mostly clear. Patchy fog overnight. Lows in the mid 40s. Southeast Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Tongue River Reservoir State Park Temperature Statistics

May Temperature

Sheridan County Airport (25.5 miles)

  • Lowest 7 May, 2025

    28.9 °F
  • Average May

    53.8 °F
  • Highest 12 May, 2025

    86.6 °F

Climate (2020–Present)

Sheridan County Airport (25.5 miles)

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  • Average Low 2020–2025

    33.2 °F
  • Average 2020–2025

    47.2 °F
  • Average High 2020–2025

    61.6 °F
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