Golden Gate Canyon State Park Weather Forecast

    • 42
    • 56

    Slight Chance Thunderstorms

    • 47
    • 65

    Partly Sunny

    • 47
    • 64

    Slight Chance Thunderstorms

    • 47
    • 63

    Chance Thunderstorms

    • 40
    • 61

    Slight Chance Thunderstorms

    • 43
    • 62

    Mostly Sunny

Today 18 Sep South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and Wes

Mostly sunny. Highs 48 to 58.

Tonight 18 Sep South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and Wes

Mostly clear. Lows 30 to 40.

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Golden Gate Canyon State Park Temperature Statistics

September Temperature

Boulder Municipal Airport (16.2 miles)

  • Lowest 6 September, 2025

    44.6 °F

  • Average September

    68.8 °F

  • Highest 10 September, 2025

    91.4 °F

Climate (2020–Present)

Boulder Municipal Airport (16.2 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    52.6 °F

  • Average High 2020–2025

    65 °F
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