Mammoth Weather Forecast

    • 22
    • 47

    Slight Chance Rain

    • 26
    • 51

    Mostly Sunny

    • 30
    • 53

    Partly Sunny

    • 27
    • 48

    Partly Sunny

    • 26
    • 49

    Slight Chance Snow

    • 26
    • 48

    Mostly Sunny

    • 32
    • 55

    Partly Sunny

Today 27 Oct Northeast Siskiyou and Northwest Modoc Counties

Mostly cloudy this Morning, then a 10 percent chance of rain early this afternoon. Sunny late this afternoon. Highs in the mid 40s to lower 50s. West Winds around 5 Mph shifting to the northwest 10 to 15 Mph this afternoon.

Tonight 27 Oct Northeast Siskiyou and Northwest Modoc Counties

Mostly clear in the evening then becoming partly cloudy. Lows in the mid 20s. West Winds 5 to 10 Mph.

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Mammoth Temperature Statistics

October Temperature

Klamath Falls International Airport (34.2 miles)

  • Lowest 13 October, 2026

    19.7 °F

  • Average October

    51.5 °F

  • Highest 7 October, 2026

    86.6 °F

Climate (2021–2026)

Klamath Falls International Airport (34.2 miles)

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  • Average Low 2021–2026

    33.9 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    63.5 °F
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