O Brien Lake Weather Forecast

    • 62
    • 90

    Chance Rain Showers

    • 54
    • 86

    Slight Chance Rain Showers

    • 54
    • 80

    Mostly Sunny

    • 57
    • 89

    Mostly Sunny

    • 53
    • 87

    Mostly Sunny

    • 50
    • 81

    Chance Rain Showers

Today 7 Sep Sheridan

Mostly sunny. Highs in the lower 90s. Southwest Winds 10 to 15 Mph.

Tonight 7 Sep Sheridan

Mostly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Lows around 60. Southwest Winds around 10 Mph, becoming northwest after midnight. Chance of precipitation 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

O Brien Lake Temperature Statistics

September Temperature

Alliance, Alliance Municipal Airport (26.7 miles)

  • Lowest 2 September, 2026

    51.7 °F

  • Average September

    74.3 °F

  • Highest 5 September, 2026

    95 °F

Climate (2021–2026)

Alliance, Alliance Municipal Airport (26.7 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    49.4 °F

  • Average High 2021–2026

    64.9 °F
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