Boulder Weather Forecast

    • 55
    • 85

    Mostly Sunny

    • 55
    • 81

    Mostly Cloudy

    • 54
    • 79

    Mostly Cloudy

    • 51
    • 76

    Chance Thunderstorms

    • 52
    • 77

    Chance Rain Showers

    • 53
    • 82

    Slight Chance Thunderstorms

    • 54
    • 84

    Mostly Sunny

Today 18 Jul Elkhorn and Boulder Mountains

Sunny. Highs 75 to 85. Southwest Winds up to 5 Mph shifting to the west in the afternoon.

Tonight 18 Jul Elkhorn and Boulder Mountains

Mostly clear. Lows 50 to 55. West Winds up to 10 Mph.

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Boulder Temperature Statistics

July Temperature

Helena Regional Airport (26.1 miles)

  • Lowest 5 July, 2025

    49.6 °F

  • Average July

    71.6 °F

  • Highest 8 July, 2025

    97.6 °F

Climate (2020–Present)

Helena Regional Airport (26.1 miles)

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  • Average Low 2020–2025

    36.1 °F

  • Average 2020–2025

    47.5 °F

  • Average High 2020–2025

    59.4 °F
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