Mammoth Weather Forecast

    • 30
    • 52

    Decreasing Clouds

    • 33
    • 54

    Mostly Cloudy

    • 38
    • 56

    Chance Rain

    • 37
    • 57

    Chance Rain

    • 32
    • 56

    Partly Sunny

    • 31
    • 56

    Mostly Sunny

Today 7 Dec Northeast Siskiyou and Northwest Modoc Counties

Mostly cloudy. Patchy fog in the morning. Highs around 50. South Winds around 5 Mph shifting to the west in the afternoon.

Tonight 7 Dec Northeast Siskiyou and Northwest Modoc Counties

Partly cloudy. Patchy fog after midnight. Lows around 30. West Winds around 5 Mph shifting to the south late in the evening and overnight.

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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

    31.2 °F

  • Highest 2 December, 2025

    50 °F

Climate (2020–Present)

Klamath Falls International Airport (34.2 miles)

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  • Average Low 2020–2025

    34 °F

  • Average 2020–2025

    48.6 °F

  • Average High 2020–2025

    63.1 °F
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