Copan Lake Weather Forecast

    • 60
    • 78

    Chance Thunderstorms

    • 60
    • 77

    Rain Showers Likely

    • 61
    • 84

    Partly Sunny

    • 64
    • 84

    Partly Sunny

    • 65
    • 83

    Chance Thunderstorms

    • 67
    • 81

    Chance Thunderstorms

Today 22 May Washington

Mostly cloudy with a chance of Showers and Thunderstorms early this Morning, then partly sunny with a slight chance of Showers and Thunderstorms this afternoon. Highs in the upper 70s. East Winds around 5 Mph. Chance of rain 30 percent.

Tonight 22 May Washington

Partly cloudy in the Evening, then becoming mostly cloudy. A slight chance of Thunderstorms. A slight chance of Showers in the Evening, then a chance of Showers after midnight. Lows around 60. East Winds around 5 Mph, becoming northwest after midnight. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Copan Lake Temperature Statistics

May Temperature

Bartlesville, Bartlesville Municipal Airport (11.8 miles)

  • Lowest 11 May, 2026

    38.6 °F

  • Average May

    64.8 °F

  • Highest 16 May, 2026

    88.6 °F

Climate (2021–Present)

Bartlesville, Bartlesville Municipal Airport (11.8 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    60.8 °F

  • Average High 2021–2026

    73.7 °F
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