Grant Lake Weather Forecast

    • 75
    • 97

    Chance Thunderstorms

    • 74
    • 96

    Chance Thunderstorms

    • 74
    • 95

    Chance Thunderstorms

    • 73
    • 95

    Slight Chance Thunderstorms

    • 74
    • 93

    Partly Sunny

    • 73
    • 93

    Slight Chance Thunderstorms

Today 12 Sep Montgomery

Mostly sunny. A slight chance of Showers and Thunderstorms late this Morning, then a chance of Showers and Thunderstorms this afternoon. Hot with Highs in the mid 90s. South Winds 5 to 10 Mph. Chance of rain 50 percent. Heat index Values up to 109.

Tonight 12 Sep Montgomery

Partly cloudy with a chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Humid with Lows in the mid 70s. South Winds 5 to 10 Mph. Chance of rain 50 percent.

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Grant Lake Temperature Statistics

September Temperature

Conroe, Montgomery County Airport (10.6 miles)

  • Lowest 10 September, 2026

    73 °F

  • Average September

    83.7 °F

  • Highest 8 September, 2026

    98.7 °F

Climate (2021–2026)

Conroe, Montgomery County Airport (10.6 miles)

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  • Average Low 2021–2026

    58.9 °F

  • Average 2021–2026

    70 °F

  • Average High 2021–2026

    81.7 °F
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