Mammoth Weather Forecast

    • 25
    • 52

    Increasing Clouds

    • 25
    • 55

    Mostly Cloudy

    • 25
    • 53

    Mostly Sunny

    • 30
    • 49

    Mostly Sunny

    • 21
    • 47

    Partly Sunny

    • 25
    • 48

    Mostly Cloudy

    • 26
    • 49

    Partly Sunny

Today 20 Jan Northeast Siskiyou and Northwest Modoc Counties

Partly cloudy early this afternoon then becoming mostly cloudy. Highs in the mid 40s to lower 50s. East Winds around 5 Mph.

Tonight 20 Jan Northeast Siskiyou and Northwest Modoc Counties

Mostly cloudy. Lows in the mid 20s to lower 30s. South Winds around 5 Mph shifting to the east late this evening and overnight.

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  • Temperature Real-Time

Mammoth Temperature Statistics

January Temperature

Klamath Falls International Airport (34.2 miles)

  • Lowest 9 January, 2026

    17.1 °F

  • Average January

    33.5 °F

  • Highest 15 January, 2026

    54 °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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