Collier Memorial State Park Weather Forecast

    • 37
    • 75

    Becoming Sunny

    • 33
    • 65

    Chance Rain Showers

    • 30
    • 59

    Mostly Sunny

    • 35
    • 70

    Sunny

    • 37
    • 73

    Mostly Sunny

    • 40
    • 74

    Mostly Sunny

Today 11 Sep Klamath Basin

Sunny. Highs in the lower to mid 70s. Southwest Winds 10 to 15 Mph.

Tonight 11 Sep Klamath Basin

Clear. Lows in the mid 30s to mid 40s. West Winds 10 to 15 Mph decreasing to 5 to 10 Mph late in the evening and overnight.

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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

    52.4 °F

  • Highest 9 September, 2026

    84 °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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