Flagstaff Weather Forecast

    • 67
    • 92

    Chance Thunderstorms

    • 62
    • 90

    Chance Thunderstorms

    • 59
    • 86

    Rain Showers Likely

    • 59
    • 85

    Rain Showers Likely

    • 60
    • 88

    Chance Thunderstorms

    • 62
    • 91

    Chance Thunderstorms

Today 23 Aug Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy. Patchy fog early in the morning. Slight chance of Thunderstorms early in the afternoon. Chance of Thunderstorms late in the afternoon. Highs in the lower to mid 90s. Chance of precipitation 40 percent.

Tonight 23 Aug Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly cloudy with a chance of Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the lower to mid 60s. Chance of precipitation 30 percent.

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Flagstaff Temperature Statistics

August Temperature

Boulder Municipal Airport (3.7 miles)

  • Lowest 5 August, 2026

    50 °F

  • Average August

    76.6 °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

    66.4 °F
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