Grant Lake Weather Forecast

    • 75
    • 96

    Slight Chance Rain Showers

    • 75
    • 95

    Partly Sunny

    • 72
    • 93

    Chance Thunderstorms

    • 70
    • 92

    Mostly Sunny

    • 72
    • 93

    Mostly Sunny

    • 73
    • 94

    Partly Sunny

    • 73
    • 93

    Slight Chance Thunderstorms

Today 15 Sep Montgomery

Mostly sunny with a slight chance of Showers with isolated Thunderstorms. Hot. Near steady temperature in the mid 90s. Southeast Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values up to 109.

Tonight 15 Sep Montgomery

Mostly clear. Patchy fog after midnight. Humid with Lows in the mid 70s. Southeast Winds 5 to 10 Mph.

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Grant Lake Temperature Statistics

September Temperature

Conroe, Montgomery County Airport (10.6 miles)

  • Lowest 11 September, 2026

    72.6 °F

  • Average September

    84.6 °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

    70.1 °F

  • Average High 2021–2026

    81.7 °F
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