Old North Boulder Weather Forecast

    • 50
    • 76

    Rain Showers Likely

    • 49
    • 72

    Chance Thunderstorms

    • 51
    • 73

    Mostly Sunny

    • 53
    • 77

    Chance Rain Showers

    • 53
    • 77

    Chance Rain Showers

    • 54
    • 77

    Chance Rain Showers

Today 19 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy with a slight chance of Showers in the Morning, then Showers likely and chance of Thunderstorms in the afternoon. Some Thunderstorms may produce heavy rainfall in the afternoon. Highs 72 to 78. Chance of rain 60 percent.

Tonight 19 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy. Chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Lows 46 to 52. Chance of rain 40 percent.

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Old North Boulder Temperature Statistics

September Temperature

Boulder Municipal Airport (2.5 miles)

  • Lowest 16 September, 2026

    51.8 °F

  • Average September

    72.8 °F

  • Highest 13 September, 2026

    96.8 °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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