Waterloo Lake Weather Forecast

    • 76
    • 99

    Hot

    • 76
    • 99

    Hot

    • 75
    • 98

    Hot

    • 71
    • 95

    Slight Chance Thunderstorms

    • 68
    • 91

    Chance Rain Showers

    • 69
    • 91

    Partly Sunny

Today 18 Sep Grayson

Sunny, hot with Highs in the upper 90s. South Winds around 5 Mph.

Tonight 18 Sep Grayson

Clear. Lows in the mid 70s. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Waterloo Lake Temperature Statistics

September Temperature

Sherman/Denison, Grayson County Airport (5.6 miles)

  • Lowest 11 September, 2026

    71.1 °F

  • Average September

    85.8 °F

  • Highest 12 September, 2026

    102.2 °F

Climate (2021–2026)

Sherman/Denison, Grayson County Airport (5.6 miles)

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  • Average Low 2021–2026

    56.1 °F

  • Average 2021–2026

    64.8 °F

  • Average High 2021–2026

    77.3 °F
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