Altamont Weather Forecast

    • 44
    • 77

    Mostly Sunny

    • 47
    • 80

    Mostly Cloudy

    • 35
    • 61

    Mostly Sunny

    • 39
    • 66

    Partly Sunny

    • 35
    • 66

    Mostly Sunny

    • 37
    • 66

    Mostly Sunny

    • 38
    • 70

    Mostly Sunny

Today 23 Sep Klamath Basin

Sunny early this morning then becoming partly cloudy. Highs in the lower to mid 70s. North Winds around 5 Mph shifting to the west this afternoon.

Tonight 23 Sep Klamath Basin

Partly cloudy this evening then clearing. Lows in the lower to mid 40s. Northwest Winds around 5 Mph this evening becoming Light, then becoming southeast around 5 Mph well after midnight.

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Altamont Temperature Statistics

September Temperature

Klamath Falls International Airport (3.7 miles)

  • Lowest 7 September, 2026

    31.6 °F

  • Average September

    55.4 °F

  • Highest 10 September, 2026

    86.6 °F

Climate (2021–2026)

Klamath Falls International Airport (3.7 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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