Collier Memorial State Park Weather Forecast

    • 36
    • 73

    Becoming Sunny

    • 39
    • 76

    Mostly Sunny

    • 41
    • 80

    Mostly Sunny

    • 40
    • 81

    Mostly Sunny

    • 38
    • 78

    Mostly Sunny

    • 40
    • 77

    Mostly Sunny

Today 18 Sep Klamath Basin

Partly cloudy early this morning then clearing. Highs in the mid 60s to mid 70s. North Winds around 5 Mph early this morning becoming Light, then becoming northwest around 5 Mph this afternoon.

Tonight 18 Sep Klamath Basin

Clear. Lows in the mid 30s to mid 40s. Northwest Winds around 5 Mph.

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Collier Memorial State Park Temperature Statistics

September Temperature

Klamath Falls International Airport (34.8 miles)

  • Lowest 7 September, 2026

    31.6 °F

  • Average September

    54.3 °F

  • Highest 10 September, 2026

    86.6 °F

Climate (2021–2026)

Klamath Falls International Airport (34.8 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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