Round Mountain Airport Weather Forecast

    • 57
    • 81

    Increasing Clouds

    • 58
    • 80

    Slight Chance Thunderstorms

    • 56
    • 79

    Chance Thunderstorms

    • 57
    • 80

    Sunny

    • 59
    • 85

    Mostly Sunny

    • 56
    • 77

    Chance Rain Showers

Today 18 Sep Central Siskiyou County

Sunny early this morning then becoming partly cloudy. Highs in the lower to mid 80s. North Winds around 5 Mph.

Tonight 18 Sep Central Siskiyou County

Mostly cloudy with a 20 percent chance of Thunderstorms. Lows in the mid 50s to lower 60s. North Winds 5 to 10 Mph shifting to the northeast well after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Round Mountain Airport Temperature Statistics

September Temperature

Montague Siskiyou County Airport (20.5 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 (20.5 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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