Grand Lake Weather Forecast

    • 73
    • 90

    Sunny

    • 76
    • 92

    Sunny

    • 77
    • 93

    Slight Chance Thunderstorms

    • 76
    • 93

    Slight Chance Thunderstorms

    • 76
    • 93

    Slight Chance Thunderstorms

    • 76
    • 92

    Slight Chance Thunderstorms

Today 18 Sep Lower St. Martin

Sunny. Highs in the lower 90s. Northeast Winds 5 to 10 Mph.

Tonight 18 Sep Lower St. Martin

Clear. Lows in the lower 70s. East Winds around 5 Mph in the Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake Temperature Statistics

September Temperature

Patterson Memorial (16.2 miles)

  • Lowest 11 September, 2026

    73.4 °F

  • Average September

    81.2 °F

  • Highest 15 September, 2026

    93 °F

Climate (2021–2026)

Patterson Memorial (16.2 miles)

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  • Average Low 2021–2026

    60.6 °F

  • Average 2021–2026

    68.5 °F

  • Average High 2021–2026

    77.4 °F
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