Mammoth Weather Forecast

    • 18
    • 38

    Freezing Fog

    • 22
    • 45

    Freezing Fog

    • 24
    • 49

    Freezing Fog

    • 28
    • 50

    Mostly Cloudy

    • 31
    • 49

    Rain/Snow Likely

    • 28
    • 46

    Chance Rain/Snow

Today 28 Dec Northeast Siskiyou and Northwest Modoc Counties

Partly cloudy in the morning then becoming sunny. Widespread freezing fog in the morning. Highs in the mid 30s to lower 40s. Northeast Winds around 5 Mph.

Tonight 28 Dec Northeast Siskiyou and Northwest Modoc Counties

Mostly clear. Lows 15 to 20. East Winds around 5 Mph.

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Mammoth Temperature Statistics

December Temperature

Klamath Falls International Airport (34.2 miles)

  • Lowest 14 December, 2025

    14 °F

  • Average December

    37.2 °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

    63.2 °F
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