Keystone Lake Weather Forecast

    • 70
    • 92

    Slight Chance Thunderstorms

    • 70
    • 91

    Chance Thunderstorms

    • 68
    • 90

    Rain Showers Likely

    • 65
    • 83

    Chance Thunderstorms

    • 65
    • 83

    Chance Rain Showers

    • 65
    • 83

    Slight Chance Thunderstorms

Today 15 Sep Osage

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

Tonight 15 Sep Osage

Partly cloudy. Near steady temperature in the lower 70s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Keystone Lake Temperature Statistics

September Temperature

Tulsa - Jones Jr. Airport (23 miles)

  • Lowest 7 September, 2025

    55.9 °F

  • Average September

    72.4 °F

  • Highest 12 September, 2025

    93.9 °F

Climate (2020–Present)

Tulsa - Jones Jr. Airport (23 miles)

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  • Average Low 2020–2025

    51.1 °F

  • Average 2020–2025

    62.3 °F

  • Average High 2020–2025

    73.8 °F
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