Central Boulder Weather Forecast

    • 49
    • 71

    Chance Rain Showers

    • 51
    • 73

    Mostly Sunny

    • 54
    • 77

    Partly Sunny

    • 54
    • 79

    Partly Sunny

    • 56
    • 80

    Partly Sunny

    • 57
    • 79

    Chance Rain Showers

Today 20 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly cloudy in the Morning, then becoming partly cloudy. Chance of Showers in the morning. Slight chance of Thunderstorms. Highs in the lower to mid 70s. Chance of rain 50 percent.

Tonight 20 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy. Slight chance of Thunderstorms in the evening. Lows 42 to 50. Chance of precipitation 10 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Central Boulder Temperature Statistics

September Temperature

Boulder Municipal Airport (2.5 miles)

  • Lowest 16 September, 2026

    51.8 °F

  • Average September

    72.5 °F

  • Highest 13 September, 2026

    96.8 °F

Climate (2021–2026)

Boulder Municipal Airport (2.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    41.3 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    66.4 °F
Get WillyWeather+ to remove ads