Mammoth Weather Forecast

    • 35
    • 66

    Becoming Sunny

    • 41
    • 72

    Mostly Sunny

    • 45
    • 77

    Mostly Sunny

    • 47
    • 82

    Mostly Sunny

    • 46
    • 82

    Mostly Sunny

    • 45
    • 83

    Mostly Sunny

Today 18 May Northeast Siskiyou and Northwest Modoc Counties

Sunny then becoming partly cloudy in the late morning and early afternoon then becoming sunny. Highs in the mid 60s. Northwest Winds around 5 Mph shifting to the northeast in the late morning and afternoon.

Tonight 18 May Northeast Siskiyou and Northwest Modoc Counties

Mostly clear. Lows in the mid 30s. Northwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mammoth Temperature Statistics

May Temperature

Klamath Falls International Airport (34.2 miles)

  • Lowest 14 May, 2026

    26.7 °F

  • Average May

    56.3 °F

  • Highest 11 May, 2026

    84.7 °F

Climate (2021–Present)

Klamath Falls International Airport (34.2 miles)

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  • Average Low 2021–2026

    34 °F

  • Average 2021–2026

    48.9 °F

  • Average High 2021–2026

    63.5 °F
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