Old North Boulder Weather Forecast

    • 45
    • 71

    Chance Thunderstorms

    • 48
    • 72

    Mostly Sunny

    • 52
    • 82

    Partly Sunny

    • 55
    • 83

    Partly Sunny

    • 54
    • 82

    Slight Chance Thunderstorms

    • 50
    • 81

    Slight Chance Thunderstorms

    • 52
    • 83

    Mostly Sunny

Today 17 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy in the Morning, then becoming mostly cloudy. Slight chance of Showers in the Morning, then a chance of Thunderstorms in the afternoon. Highs in the lower 70s. Chance of rain 40 percent.

Tonight 17 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly cloudy. Slight chance of Thunderstorms in the evening. Chance of Showers through the night. Lows in the mid to upper 40s. Chance of rain 50 percent.

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Old North Boulder Temperature Statistics

September Temperature

Boulder Municipal Airport (2.5 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 (2.5 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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