Mammoth Weather Forecast

    • 36
    • 54

    Increasing Clouds

    • 41
    • 60

    Chance Rain

    • 36
    • 55

    Rain

    • 32
    • 48

    Rain Likely

    • 37
    • 50

    Rain

    • 31
    • 47

    Rain

Today 14 Dec Northeast Siskiyou and Northwest Modoc Counties

Sunny this morning then becoming partly cloudy. Highs in the lower to mid 50s. Southeast Winds 5 to 10 Mph.

Tonight 14 Dec Northeast Siskiyou and Northwest Modoc Counties

Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid 30s to lower 40s. Southeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mammoth Temperature Statistics

December Temperature

Klamath Falls International Airport (34.2 miles)

  • Lowest 1 December, 2025

    17.1 °F

  • Average December

    36.2 °F

  • Highest 10 December, 2025

    59 °F

Climate (2020–Present)

Klamath Falls International Airport (34.2 miles)

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  • Average Low 2020–2025

    34 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    63.1 °F
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