Grand Lake Weather Forecast

    • 78
    • 92

    Thunderstorms Likely

    • 78
    • 92

    Chance Thunderstorms

    • 77
    • 93

    Thunderstorms Likely

    • 77
    • 92

    Thunderstorms Likely

    • 76
    • 92

    Chance Thunderstorms

    • 77
    • 93

    Chance Thunderstorms

    • 76
    • 92

    Chance Thunderstorms

Today 15 Aug Lower St. Martin

Thunderstorms likely. Showers likely. Highs in the lower 90s. Temperature falling into the upper 80s this afternoon. North Winds around 5 Mph, becoming southwest around 5 Mph this afternoon. Chance of rain 70 percent. Heat index Values up to 106.

Tonight 15 Aug Lower St. Martin

Partly cloudy this Evening, then clearing. Lows in the upper 70s. South Winds around 5 Mph this Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake Temperature Statistics

August Temperature

Patterson Memorial (16.2 miles)

  • Lowest 8 August, 2025

    73.9 °F

  • Average August

    81.7 °F

  • Highest 13 August, 2025

    93 °F

Climate (2020–Present)

Patterson Memorial (16.2 miles)

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  • Average Low 2020–2025

    60.3 °F

  • Average 2020–2025

    67.9 °F

  • Average High 2020–2025

    76.8 °F
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