Union Square Weather Forecast

    • 65
    • 90

    Thunderstorms Likely

    • 61
    • 84

    Rain Showers Likely

    • 60
    • 84

    Thunderstorms Likely

    • 62
    • 90

    Slight Chance Thunderstorms

    • 63
    • 93

    Mostly Sunny

    • 66
    • 95

    Partly Sunny

Today 22 Jul Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy in the Morning, then mostly cloudy with a chance of Thunderstorms early in the afternoon. Showers likely and chance of Thunderstorms late in the afternoon. Highs near 90. Chance of rain 60 percent.

Tonight 22 Jul Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly cloudy. Chance of Thunderstorms in the evening. Lows in the lower 60s. Chance of precipitation 50 percent.

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Union Square Temperature Statistics

July Temperature

Broomfield / Jeffco (12.4 miles)

  • Lowest 7 July, 2025

    55.4 °F

  • Average July

    72.2 °F

  • Highest 9 July, 2025

    100.4 °F

Climate (2020–Present)

Broomfield / Jeffco (12.4 miles)

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  • Average Low 2020–2025

    41.2 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    64.8 °F
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