Waterloo Lake Weather Forecast

    • 74
    • 88

    Chance Thunderstorms

    • 74
    • 89

    Slight Chance Thunderstorms

    • 74
    • 91

    Slight Chance Thunderstorms

    • 74
    • 92

    Slight Chance Thunderstorms

    • 76
    • 94

    Partly Sunny

    • 76
    • 96

    Hot

    • 76
    • 97

    Hot

Today 5 Jul Grayson

Partly sunny with a 30 percent chance of Showers and Thunderstorms. Highs in the upper 80s. South Winds around 10 Mph.

Tonight 5 Jul Grayson

Partly cloudy. Humid with Lows in the lower 70s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Waterloo Lake Temperature Statistics

July Temperature

Sherman/Denison, Grayson County Airport (5.6 miles)

  • Lowest 1 July, 2025

    69.8 °F

  • Average July

    77.5 °F

  • Highest 2 July, 2025

    89.6 °F

Climate (2020–Present)

Sherman/Denison, Grayson County Airport (5.6 miles)

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  • Average Low 2020–2025

    55.2 °F

  • Average 2020–2025

    63.9 °F

  • Average High 2020–2025

    76.1 °F
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