James Lake Weather Forecast

    • 49
    • 94

    Slight Chance Thunderstorms

    • 45
    • 90

    Mostly Sunny

    • 43
    • 86

    Mostly Sunny

    • 45
    • 86

    Mostly Sunny

    • 48
    • 91

    Mostly Sunny

    • 49
    • 92

    Partly Sunny

Today 19 Aug Butte/Blackfoot Region

Mostly sunny. A 20 percent chance of rain in the afternoon. Highs in the mid 80s to lower 90s.

Tonight 19 Aug Butte/Blackfoot Region

Partly cloudy. A 20 percent chance of rain in the evening. Lows in the upper 40s to mid 50s.

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James Lake Temperature Statistics

August Temperature

Missoula, Missoula International Airport (42.9 miles)

  • Lowest 8 August, 2025

    47.6 °F

  • Average August

    68.1 °F

  • Highest 12 August, 2025

    94.6 °F

Climate (2020–Present)

Missoula, Missoula International Airport (42.9 miles)

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  • Average Low 2020–2025

    35.5 °F

  • Average 2020–2025

    47 °F

  • Average High 2020–2025

    59.2 °F
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