Baseline Sub Weather Forecast

    • 50
    • 77

    Chance Thunderstorms

    • 51
    • 75

    Mostly Sunny

    • 51
    • 82

    Partly Sunny

    • 48
    • 79

    Slight Chance Thunderstorms

    • 49
    • 76

    Chance Rain Showers

Today 13 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy in the morning. Slight chance of Showers in the Morning, then Showers likely and chance of Thunderstorms in the afternoon. Highs in the mid to upper 70s. Chance of rain 70 percent.

Tonight 13 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Showers likely and slight chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Lows around 50. Chance of rain 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Baseline Sub Temperature Statistics

September Temperature

Boulder Municipal Airport (2.5 miles)

  • Lowest 6 September, 2025

    44.6 °F

  • Average September

    69.7 °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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