Keystone Peak Weather Forecast

    • 64
    • 78

    Chance Thunderstorms

    • 64
    • 77

    Chance Thunderstorms

    • 64
    • 77

    Chance Thunderstorms

    • 66
    • 78

    Mostly Sunny

    • 66
    • 81

    Mostly Sunny

    • 67
    • 82

    Slight Chance Thunderstorms

    • 68
    • 84

    Mostly Sunny

Today 17 Sep Upper Santa Cruz River and Altar Valleys including Nogales

Mostly cloudy with a 50 percent chance of Showers and Thunderstorms. Highs 85 to 91.

Tonight 17 Sep Upper Santa Cruz River and Altar Valleys including Nogales

Mostly cloudy. Chance of Showers and Thunderstorms in the Evening, then slight chance of Showers and Thunderstorms after midnight. Lows 64 to 69. Chance of precipitation 50 percent.

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Keystone Peak Temperature Statistics

September Temperature

Tucson Ryan Field Airport (18 miles)

  • Lowest 15 September, 2025

    69.8 °F

  • Average September

    89.9 °F

  • Highest 10 September, 2025

    104 °F

Climate (2020–Present)

Tucson Ryan Field Airport (18 miles)

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  • Average Low 2020–2025

    56.3 °F

  • Average 2020–2025

    73.6 °F

  • Average High 2020–2025

    84.1 °F
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