Copan Lake Weather Forecast

    • 69
    • 91

    Slight Chance Thunderstorms

    • 67
    • 91

    Partly Sunny

    • 67
    • 90

    Partly Sunny

    • 64
    • 87

    Rain Showers Likely

    • 62
    • 83

    Slight Chance Thunderstorms

    • 63
    • 85

    Partly Sunny

Today 14 Sep Washington

Partly sunny. A slight chance of Showers in the afternoon. Highs in the lower 90s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 14 Sep Washington

Mostly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the upper 60s. Southeast Winds around 5 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Copan Lake Temperature Statistics

September Temperature

Bartlesville, Bartlesville Municipal Airport (11.8 miles)

  • Lowest 7 September, 2025

    50 °F

  • Average September

    69 °F

  • Highest 11 September, 2025

    90 °F

Climate (2020–Present)

Bartlesville, Bartlesville Municipal Airport (11.8 miles)

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  • Average Low 2020–2025

    47.1 °F

  • Average 2020–2025

    59.9 °F

  • Average High 2020–2025

    72.5 °F
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