Lower Arapahoe Weather Forecast

    • 61
    • 91

    Rain Showers Likely

    • 57
    • 79

    Thunderstorms

    • 57
    • 81

    Rain Showers

    • 56
    • 80

    Thunderstorms Likely

    • 55
    • 79

    Thunderstorms Likely

    • 57
    • 81

    Chance Thunderstorms

    • 59
    • 86

    Slight Chance Thunderstorms

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

Mostly cloudy with a 50 percent chance of Thunderstorms. Highs 90 to 96. West Winds 10 to 15 Mph with Gusts up to 20 Mph.

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

Mostly cloudy. Chance of Thunderstorms early in the Evening, then a chance of Showers and slight chance of Thunderstorms during the late evening hours. Lows near 60. Northwest Winds 10 to 15 Mph with Gusts up to 20 Mph in the Evening, becoming light. Chance of rain 40 percent.

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Lower Arapahoe Temperature Statistics

August Temperature

Boulder Municipal Airport (3.7 miles)

  • Lowest 5 August, 2026

    50 °F

  • Average August

    78.3 °F

  • Highest 2 August, 2026

    104 °F

Climate (2021–2026)

Boulder Municipal Airport (3.7 miles)

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  • Average Low 2021–2026

    41.3 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    66.3 °F
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