Mack Weather Forecast

    • 53
    • 84

    Mostly Sunny

    • 50
    • 85

    Isolated Thunderstorms

    • 49
    • 79

    Mostly Sunny

    • 52
    • 80

    Mostly Sunny

    • 54
    • 84

    Partly Sunny

    • 55
    • 83

    Slight Chance Thunderstorms

Today 15 Sep Grand Valley

Mostly clear. Highs 75 to 85. East Winds 10 to 15 Mph with Gusts up to 20 Mph, becoming west in the afternoon.

Tonight 15 Sep Grand Valley

Partly cloudy. Lows in the 50s. East Winds 10 to 15 Mph after midnight.

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Mack Temperature Statistics

September Temperature

Grand Junction Regional Airport (18 miles)

  • Lowest 13 September, 2025

    48 °F

  • Average September

    72.6 °F

  • Highest 2 September, 2025

    93 °F

Climate (2020–Present)

Grand Junction Regional Airport (18 miles)

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  • Average Low 2020–2025

    43 °F

  • Average 2020–2025

    55.5 °F

  • Average High 2020–2025

    68.4 °F
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