Mammoth Weather Forecast

    • 45
    • 80

    Sunny

    • 53
    • 87

    Mostly Sunny

    • 45
    • 86

    Partly Sunny

    • 45
    • 78

    Mostly Sunny

    • 39
    • 64

    Mostly Sunny

    • 41
    • 63

    Mostly Sunny

Today 8 Sep Northeast Siskiyou and Northwest Modoc Counties

Sunny. Highs in the mid 70s to lower 80s. North Winds around 5 Mph shifting to the east in the afternoon.

Tonight 8 Sep Northeast Siskiyou and Northwest Modoc Counties

Mostly clear. Lows in the mid 40s to lower 50s. North Winds around 5 Mph shifting to the east late in the evening and overnight.

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Mammoth Temperature Statistics

September Temperature

Klamath Falls International Airport (34.2 miles)

  • Lowest 4 September, 2026

    32.6 °F

  • Average September

    50.4 °F

  • Highest 1 September, 2026

    73.7 °F

Climate (2021–2026)

Klamath Falls International Airport (34.2 miles)

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  • Average Low 2021–2026

    33.9 °F

  • Average 2021–2026

    48.6 °F

  • Average High 2021–2026

    63.3 °F
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