Sidney Weather Forecast

    • 54
    • 81

    Slight Chance Thunderstorms

    • 52
    • 85

    Mostly Sunny

    • 55
    • 86

    Slight Chance Thunderstorms

    • 55
    • 84

    Slight Chance Thunderstorms

    • 55
    • 84

    Slight Chance Thunderstorms

    • 50
    • 81

    Chance Thunderstorms

Today 7 Sep Cheyenne

Mostly sunny. A slight chance of Showers and Thunderstorms in the afternoon. Highs in the lower 80s. South Winds 10 to 15 Mph. Chance of rain 20 percent.

Tonight 7 Sep Cheyenne

Mostly cloudy. Lows in the mid 50s. Southwest Winds 10 to 15 Mph.

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Sidney Temperature Statistics

September Temperature

Sidney, Sidney Municipal Airport (2.5 miles)

  • Lowest 2 September, 2025

    50 °F

  • Average September

    65.9 °F

  • Highest 2 September, 2025

    87.1 °F

Climate (2020–Present)

Sidney, Sidney Municipal Airport (2.5 miles)

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  • Average Low 2020–2025

    34.2 °F

  • Average 2020–2025

    49.1 °F

  • Average High 2020–2025

    64.1 °F
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