Mammoth Weather Forecast

    • 43
    • 75

    Sunny

    • 45
    • 78

    Sunny

    • 46
    • 82

    Mostly Sunny

    • 46
    • 80

    Mostly Sunny

    • 48
    • 83

    Partly Sunny

    • 47
    • 83

    Mostly Sunny

Today 29 Sep Northeast Siskiyou and Northwest Modoc Counties

Sunny. Highs in the lower to mid 70s. West Winds around 5 Mph shifting to the northwest in the late morning and afternoon.

Tonight 29 Sep Northeast Siskiyou and Northwest Modoc Counties

Clear. Lows in the lower to mid 40s. West Winds 10 to 15 Mph decreasing to around 5 Mph after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Mammoth Temperature Statistics

September Temperature

Klamath Falls International Airport (34.2 miles)

  • Lowest 7 September, 2026

    31.6 °F

  • Average September

    55.2 °F

  • Highest 10 September, 2026

    86.6 °F

Climate (2021–2026)

Klamath Falls International Airport (34.2 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    33.9 °F

  • Average 2021–2026

    48.6 °F

  • Average High 2021–2026

    63.3 °F
Get WillyWeather+ to remove ads