Chautauqua Weather Forecast

    • 54
    • 87

    Slight Chance Thunderstorms

    • 55
    • 73

    Chance Rain Showers

    • 59
    • 82

    Chance Thunderstorms

    • 57
    • 77

    Rain Showers

    • 55
    • 80

    Chance Thunderstorms

    • 52
    • 76

    Chance Thunderstorms

Today 14 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly cloudy. Slight chance of Showers in the morning. Slight chance of Thunderstorms late in the afternoon. Highs 84 to 90. West Winds 10 to 15 Mph in the afternoon. Chance of rain 20 percent.

Tonight 14 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly cloudy. Slight chance of Thunderstorms in the Evening, then a slight chance of Showers after midnight. Lows 48 to 56. North Winds 10 to 15 Mph with Gusts up to 30 Mph after midnight. Chance of rain 20 percent.

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Chautauqua Temperature Statistics

September Temperature

Boulder Municipal Airport (3.7 miles)

  • Lowest 10 September, 2026

    53.6 °F

  • Average September

    73.8 °F

  • Highest 4 September, 2026

    95 °F

Climate (2021–2026)

Boulder Municipal Airport (3.7 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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