Boulder Weather Forecast

    • 40
    • 73

    Mostly Sunny

    • 48
    • 79

    Mostly Sunny

    • 47
    • 83

    Chance Rain

    • 41
    • 67

    Chance Thunderstorms

    • 40
    • 68

    Chance Rain

    • 36
    • 62

    Partly Sunny

Today 11 May Elkhorn and Boulder Mountains

Sunny. Highs 62 to 72. Northwest Winds 5 to 15 Mph. Gusts up to 40 Mph increasing to 50 Mph in the afternoon.

Tonight 11 May Elkhorn and Boulder Mountains

Mostly clear. Lows 36 to 42. Northwest Winds 5 to 15 Mph with Gusts to around 50 Mph shifting to the north up to 5 Mph with Gusts to around 20 Mph after midnight.

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Boulder Temperature Statistics

May Temperature

Helena Regional Airport (26.1 miles)

  • Lowest 6 May, 2026

    27.6 °F

  • Average May

    53.7 °F

  • Highest 3 May, 2026

    76.6 °F

Climate (2021–Present)

Helena Regional Airport (26.1 miles)

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  • Average Low 2021–2026

    36.5 °F

  • Average 2021–2026

    48.1 °F

  • Average High 2021–2026

    60.1 °F
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