Athanasiou Valley Airport Weather Forecast

    • 51
    • 75

    Decreasing Clouds

    • 52
    • 70

    Slight Chance Thunderstorms

    • 54
    • 76

    Chance Rain Showers

    • 48
    • 73

    Rain Showers Likely

    • 48
    • 62

    Rain Showers

    • 49
    • 72

    Chance Thunderstorms

Today 11 Sep Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below

Mostly sunny in the Morning, then becoming mostly cloudy. Highs 76 to 86.

Tonight 11 Sep Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below

Partly cloudy. Lows 50 to 58.

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Athanasiou Valley Airport Temperature Statistics

September Temperature

Boulder Municipal Airport (18 miles)

  • Lowest 9 September, 2026

    55.4 °F

  • Average September

    74.8 °F

  • Highest 4 September, 2026

    95 °F

Climate (2021–2026)

Boulder Municipal Airport (18 miles)

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  • Average Low 2021–2026

    41.3 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    66.4 °F
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