Flagstaff Weather Forecast

    • 55
    • 81

    Mostly Sunny

    • 57
    • 79

    Chance Thunderstorms

    • 57
    • 83

    Chance Thunderstorms

    • 57
    • 82

    Chance Thunderstorms

    • 58
    • 85

    Chance Thunderstorms

    • 58
    • 85

    Slight Chance Thunderstorms

Today 31 May Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly sunny. Highs 78 to 84. West Winds 10 to 15 Mph with Gusts up to 30 Mph in the afternoon.

Tonight 31 May Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly clear. Lows in the mid 40s to lower 50s.

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Flagstaff Temperature Statistics

May Temperature

Boulder Municipal Airport (3.7 miles)

  • Lowest 1 May, 2026

    32 °F

  • Average May

    58.4 °F

  • Highest 11 May, 2026

    87.8 °F

Climate (2021–Present)

Boulder Municipal Airport (3.7 miles)

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  • Average Low 2021–2026

    41.2 °F

  • Average 2021–2026

    53.6 °F

  • Average High 2021–2026

    66.2 °F
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