Mammoth Weather Forecast

    • 21
    • 41

    Mostly Sunny

    • 23
    • 45

    Mostly Cloudy

    • 24
    • 48

    Partly Sunny

    • 29
    • 50

    Partly Sunny

    • 30
    • 55

    Partly Sunny

    • 29
    • 56

    Mostly Sunny

Today 9 Jan Northeast Siskiyou and Northwest Modoc Counties

Sunny. Highs around 40. East Winds 5 to 10 Mph.

Tonight 9 Jan Northeast Siskiyou and Northwest Modoc Counties

Mostly clear in the evening then becoming partly cloudy. Lows in the lower to mid 20s. East Winds around 5 Mph.

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Mammoth Temperature Statistics

January Temperature

Klamath Falls International Airport (34.2 miles)

  • Lowest 6 January, 2026

    30 °F

  • Average January

    38.9 °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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