Mount Shasta Weather Forecast

    • 53
    • 87

    Increasing Clouds

    • 51
    • 80

    Chance Rain Showers

    • 50
    • 81

    Mostly Sunny

    • 51
    • 83

    Sunny

    • 53
    • 86

    Mostly Sunny

    • 49
    • 79

    Chance Rain Showers

Today 18 Sep South Central Siskiyou County

Sunny in the Morning, then partly cloudy with a 10 percent chance of Thunderstorms in the afternoon. Highs in the lower 80s to lower 90s. Northeast Winds around 5 Mph shifting to the south late in the afternoon.

Tonight 18 Sep South Central Siskiyou County

Mostly cloudy with a slight chance of Thunderstorms in the Evening, then partly cloudy with a slight chance of Showers after midnight. Lows in the mid 40s to mid 50s. Southwest Winds 5 to 10 Mph. Chance of precipitation 20 percent.

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Mount Shasta Temperature Statistics

September Temperature

Mount Shasta (0 miles)

  • Lowest 15 September, 2025

    44.1 °F

  • Average September

    63.1 °F

  • Highest 1 September, 2025

    90 °F

Climate (2020–Present)

Mount Shasta (0 miles)

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  • Average Low 2020–2025

    39.5 °F

  • Average 2020–2025

    52.4 °F

  • Average High 2020–2025

    65.7 °F
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