Bighorn Reservoir Weather Forecast

    • 36
    • 51

    Decreasing Clouds

    • 41
    • 59

    Chance Rain Showers

    • 39
    • 55

    Chance Rain Showers

    • 45
    • 61

    Mostly Sunny

    • 45
    • 62

    Mostly Sunny

    • 41
    • 59

    Partly Sunny

Today 21 Sep Bighorn Mountains Southeast

Patchy fog this morning. Partly cloudy. Highs in the upper 50s. West Winds around 10 Mph with Gusts up to 20 Mph, becoming south this afternoon.

Tonight 21 Sep Bighorn Mountains Southeast

Mostly clear. Lows in the lower 40s. South Winds around 10 Mph, becoming west after midnight.

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  • Temperature Real-Time

Bighorn Reservoir Temperature Statistics

September Temperature

Sheridan County Airport (19.3 miles)

  • Lowest 15 September, 2026

    36.6 °F

  • Average September

    64.3 °F

  • Highest 4 September, 2026

    97.6 °F

Climate (2021–2026)

Sheridan County Airport (19.3 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    47.6 °F

  • Average High 2021–2026

    62.2 °F
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