Collier Memorial State Park Weather Forecast

    • 42
    • 83

    Sunny

    • 45
    • 83

    Partly Sunny

    • 45
    • 80

    Partly Sunny

    • 42
    • 76

    Mostly Sunny

    • 41
    • 76

    Mostly Sunny

    • 43
    • 80

    Mostly Sunny

Today 17 Sep Klamath Basin

Sunny. Highs in the lower to mid 80s. East Winds around 5 Mph shifting to the southwest this afternoon.

Tonight 17 Sep Klamath Basin

Clear. Lows in the lower 40s to lower 50s. Northwest Winds 5 to 10 Mph shifting to the north well after midnight.

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Collier Memorial State Park Temperature Statistics

September Temperature

Klamath Falls International Airport (34.8 miles)

  • Lowest 15 September, 2025

    37 °F

  • Average September

    61.2 °F

  • Highest 2 September, 2025

    89.1 °F

Climate (2020–Present)

Klamath Falls International Airport (34.8 miles)

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  • Average Low 2020–2025

    33.8 °F

  • Average 2020–2025

    48.6 °F

  • Average High 2020–2025

    63.1 °F
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