Mammoth Weather Forecast

    • 58
    • 87

    Decreasing Clouds

    • 59
    • 90

    Increasing Clouds

    • 57
    • 92

    Slight Chance Thunderstorms

    • 53
    • 90

    Sunny

    • 53
    • 90

    Sunny

    • 52
    • 90

    Sunny

    • 52
    • 90

    Mostly Sunny

Today 20 Jul Northeast Siskiyou and Northwest Modoc Counties

Mostly cloudy. Highs in the mid 80s. West Winds 5 to 10 Mph.

Tonight 20 Jul Northeast Siskiyou and Northwest Modoc Counties

Partly cloudy. Lows in the mid 50s to lower 60s. West Winds 10 to 15 Mph shifting to the northwest around 5 Mph late this Evening, then shifting to the south after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mammoth Temperature Statistics

July Temperature

Klamath Falls International Airport (34.2 miles)

  • Lowest 1 July, 2026

    32.6 °F

  • Average July

    67.1 °F

  • Highest 14 July, 2026

    90.6 °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

    48.7 °F

  • Average High 2021–2026

    63.4 °F
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