Marysville Weather Forecast

    • 56
    • 74

    Mostly Cloudy

    • 60
    • 78

    Mostly Sunny

    • 60
    • 85

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

    • 53
    • 77

    Mostly Sunny

    • 52
    • 72

    Mostly Sunny

Today 17 Aug Upper Blackfoot and MacDonald Pass

Not as warm. Mostly cloudy. Haze through the day. Areas of smoke in the afternoon. Chance of rain Showers and slight chance of Thunderstorms in the afternoon. Highs 70 to 75. West Winds up to 10 Mph. Chance of precipitation 50 percent.

Tonight 17 Aug Upper Blackfoot and MacDonald Pass

Mostly cloudy with a 20 percent chance of Thunderstorms in the Evening, then partly cloudy after midnight. Haze through the night. Lows 50 to 55. Southwest Winds up to 10 Mph.

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Marysville Temperature Statistics

August Temperature

Helena Regional Airport (17.4 miles)

  • Lowest 7 August, 2025

    49.6 °F

  • Average August

    69.7 °F

  • Highest 12 August, 2025

    95.6 °F

Climate (2020–Present)

Helena Regional Airport (17.4 miles)

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  • Average Low 2020–2025

    36 °F

  • Average 2020–2025

    47.5 °F

  • Average High 2020–2025

    59.4 °F
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