Mammoth Weather Forecast

    • 29
    • 40

    Rain/Snow

    • 31
    • 43

    Chance Rain/Snow

    • 24
    • 41

    Chance Rain/Snow

    • 20
    • 38

    Slight Chance Snow

    • 22
    • 42

    Partly Sunny

    • 24
    • 47

    Partly Sunny

Today 5 Jan Northeast Siskiyou and Northwest Modoc Counties

Rain and snow likely. Snow level 4000 feet rising to 4500 feet in the afternoon. Snow accumulation up to 1 inch. Highs around 40. South Winds 10 to 15 Mph shifting to the west 5 to 10 Mph late in the afternoon. Chance of precipitation 60 percent.

Tonight 5 Jan Northeast Siskiyou and Northwest Modoc Counties

Mostly cloudy. A 20 percent chance of rain and snow in the evening. Snow level 4000 feet. Lows in the mid 20s to lower 30s. Southwest Winds around 5 Mph.

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Mammoth Temperature Statistics

January Temperature

Klamath Falls International Airport (34.2 miles)

  • Lowest 1 January, 2026

    36 °F

  • Average January

    42.2 °F

  • Highest 1 January, 2026

    46.9 °F

Climate (2021–Present)

Klamath Falls International Airport (34.2 miles)

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  • Average Low 2021–2026

    34 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    63.2 °F
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