Etna Weather Forecast

    • 56
    • 86

    Slight Chance Thunderstorms

    • 56
    • 84

    Chance Rain Showers

    • 53
    • 83

    Partly Sunny

    • 54
    • 84

    Sunny

    • 55
    • 88

    Mostly Sunny

    • 53
    • 79

    Chance Rain Showers

Today 18 Sep Western Siskiyou County

Sunny in the Morning, then partly cloudy with a 10 percent chance of Thunderstorms in the afternoon. Highs in the mid 70s to mid 80s. Northeast Winds around 5 Mph shifting to the north late in the afternoon.

Tonight 18 Sep Western Siskiyou County

Partly cloudy with a slight chance of Thunderstorms in the Evening, then mostly cloudy with a slight chance of Showers after midnight. Lows in the mid 50s to lower 60s. Northwest Winds around 5 Mph shifting to the east late in the evening and overnight. Chance of precipitation 20 percent.

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  • Temperature Forecast NOAA

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Etna Temperature Statistics

September Temperature

Montague Siskiyou County Airport (31.1 miles)

  • Lowest 15 September, 2025

    44.1 °F

  • Average September

    68.2 °F

  • Highest 1 September, 2025

    95 °F

Climate (2020–Present)

Montague Siskiyou County Airport (31.1 miles)

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  • Average Low 2020–2025

    39.6 °F

  • Average 2020–2025

    54.2 °F

  • Average High 2020–2025

    69 °F
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