Garrison Lakes Weather Forecast

    • 56
    • 81

    Chance Thunderstorms

    • 51
    • 76

    Rain Showers Likely

    • 52
    • 75

    Slight Chance Rain Showers

    • 54
    • 82

    Partly Sunny

    • 49
    • 81

    Slight Chance Thunderstorms

    • 49
    • 76

    Chance Rain Showers

    • 52
    • 81

    Mostly Sunny

Today 12 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly cloudy. Chance of Showers in the Morning, then a chance of Thunderstorms in the afternoon. Highs around 80. West Winds 10 to 15 Mph with Gusts up to 20 Mph in the afternoon. Chance of rain 50 percent.

Tonight 12 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly cloudy. Chance of Showers and slight chance of Thunderstorms in the Evening, then a slight chance of Showers after midnight. Lows in the lower to mid 50s. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Garrison Lakes Temperature Statistics

September Temperature

Broomfield / Jeffco (7.5 miles)

  • Lowest 6 September, 2025

    48.2 °F

  • Average September

    66.7 °F

  • Highest 10 September, 2025

    91.4 °F

Climate (2020–Present)

Broomfield / Jeffco (7.5 miles)

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  • Average Low 2020–2025

    41.2 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    64.9 °F
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