Flagstaff Weather Forecast

    • 40
    • 68

    Rain Showers

    • 33
    • 47

    Rain/Snow

    • 37
    • 49

    Rain/Snow Likely

    • 40
    • 58

    Rain Showers Likely

    • 43
    • 65

    Chance Thunderstorms

    • 49
    • 73

    Slight Chance Thunderstorms

Today 17 May Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Slight chance of Showers in the Morning, then Showers likely and chance of Thunderstorms in the afternoon. Highs 65 to 71. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

Tonight 17 May Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy. Slight chance of Showers after Midnight, then a chance of Showers towards Sunrise. Lows 46 to 52. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

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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