Grass Lake Weather Forecast

    • 43
    • 78

    Slight Chance Thunderstorms

    • 44
    • 74

    Mostly Sunny

    • 45
    • 78

    Mostly Sunny

    • 47
    • 79

    Partly Sunny

    • 48
    • 81

    Partly Sunny

    • 49
    • 83

    Mostly Sunny

    • 53
    • 86

    Mostly Sunny

Today 3 Aug North Central and Southeast Siskiyou County

Partly cloudy with a 10 percent chance of Thunderstorms. Highs in the lower 70s to lower 80s. Southwest Winds 5 to 10 Mph.

Tonight 3 Aug North Central and Southeast Siskiyou County

Partly cloudy with a 20 percent chance of Thunderstorms early this Evening, then partly cloudy late this evening and overnight. Lows in the mid 40s to lower 50s. Northwest Winds 5 to 10 Mph.

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Grass Lake Temperature Statistics

August Temperature

Montague Siskiyou County Airport (17.4 miles)

  • Lowest 1 August, 2025

    53.1 °F

  • Average August

    68 °F

  • Highest 1 August, 2025

    88 °F

Climate (2020–Present)

Montague Siskiyou County Airport (17.4 miles)

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  • Average Low 2020–2025

    39.7 °F

  • Average 2020–2025

    54.2 °F

  • Average High 2020–2025

    69.1 °F
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