Keystone Lake Weather Forecast

    • 70
    • 85

    Slight Chance Thunderstorms

    • 71
    • 91

    Chance Thunderstorms

    • 71
    • 91

    Chance Thunderstorms

    • 67
    • 89

    Rain Showers Likely

    • 61
    • 83

    Slight Chance Thunderstorms

    • 57
    • 80

    Mostly Sunny

    • 55
    • 77

    Mostly Sunny

Today 31 Aug Armstrong

Partly sunny with a slight chance of Showers and Thunderstorms. Near steady temperature in the lower 80s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 31 Aug Armstrong

A slight chance of Thunderstorms late this evening. Mostly cloudy with a slight chance of Showers. Warm with Lows around 70. South Winds around 5 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Keystone Lake Temperature Statistics

August Temperature

Indiana / Stewart Field (12.4 miles)

  • Lowest 29 August, 2026

    48.2 °F

  • Average August

    69.5 °F

  • Highest 5 August, 2026

    86 °F

Climate (2021–2026)

Indiana / Stewart Field (12.4 miles)

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  • Average Low 2021–2026

    42.3 °F

  • Average 2021–2026

    51.9 °F

  • Average High 2021–2026

    61.7 °F
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