Grand Lake Weather Forecast

    • 70
    • 97

    Rain Showers Likely

    • 68
    • 93

    Chance Rain Showers

    • 67
    • 91

    Slight Chance Thunderstorms

    • 68
    • 91

    Partly Sunny

    • 68
    • 92

    Partly Sunny

    • 67
    • 91

    Partly Sunny

Today 20 Sep Stephens

Partly sunny. A slight chance of Showers and Thunderstorms this Morning, then Showers and Thunderstorms likely this afternoon. Highs in the upper 90s. Southwest Winds 5 to 10 Mph. Chance of rain 60 percent.

Tonight 20 Sep Stephens

Mostly cloudy in the Evening, then becoming partly cloudy. A 50 percent chance of Showers and Thunderstorms. Lows around 70. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Lake Temperature Statistics

September Temperature

Stephens County Airport (3.1 miles)

  • Lowest 11 September, 2026

    71.6 °F

  • Average September

    88.9 °F

  • Highest 3 September, 2026

    105.6 °F

Climate (2021–2026)

Stephens County Airport (3.1 miles)

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  • Average Low 2021–2026

    57.1 °F

  • Average 2021–2026

    69 °F

  • Average High 2021–2026

    81.4 °F
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