Old North Boulder Weather Forecast

    • 64
    • 92

    Slight Chance Thunderstorms

    • 65
    • 89

    Slight Chance Thunderstorms

    • 66
    • 91

    Chance Thunderstorms

    • 63
    • 88

    Chance Thunderstorms

    • 62
    • 87

    Slight Chance Thunderstorms

    • 63
    • 87

    Chance Rain Showers

    • 62
    • 88

    Chance Rain Showers

Today 4 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly sunny. Slight chance of Showers late in the afternoon. Highs 89 to 95. Southeast Winds 10 to 15 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

Tonight 4 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy. Lows in the lower to mid 60s.

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Old North Boulder Temperature Statistics

September Temperature

Boulder Municipal Airport (2.5 miles)

  • Lowest 1 September, 2026

    60.8 °F

  • Average September

    74.3 °F

  • Highest 2 September, 2026

    89.6 °F

Climate (2021–2026)

Boulder Municipal Airport (2.5 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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