Union Square Weather Forecast

    • 58
    • 80

    Thunderstorms Likely

    • 58
    • 83

    Slight Chance Thunderstorms

    • 61
    • 88

    Partly Sunny

    • 61
    • 92

    Slight Chance Thunderstorms

    • 59
    • 86

    Thunderstorms Likely

    • 61
    • 90

    Slight Chance Thunderstorms

    • 62
    • 91

    Chance Thunderstorms

Today 15 Aug Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Chance of Thunderstorms early in the Afternoon, then Thunderstorms likely late in the afternoon. Some Thunderstorms may produce heavy rainfall. Highs near 80. Chance of precipitation 60 percent.

Tonight 15 Aug Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly cloudy in the Evening, then becoming partly cloudy. Chance of Thunderstorms in the Evening, then a slight chance of Showers after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Lows in the upper 50s. Chance of rain 40 percent.

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Union Square Temperature Statistics

August Temperature

Broomfield / Jeffco (12.4 miles)

  • Lowest 4 August, 2026

    51.8 °F

  • Average August

    74.5 °F

  • Highest 2 August, 2026

    102.2 °F

Climate (2021–2026)

Broomfield / Jeffco (12.4 miles)

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  • Average Low 2021–2026

    42.1 °F

  • Average 2021–2026

    51.7 °F

  • Average High 2021–2026

    66 °F
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