Waterloo Lake Weather Forecast

    • 83
    • 106

    Hot

    • 80
    • 105

    Hot

    • 78
    • 104

    Hot

    • 79
    • 104

    Hot

    • 81
    • 104

    Hot

    • 81
    • 104

    Hot

Today 19 Aug Grayson

Sunny, hot with Highs around 105. Southwest Winds 5 to 10 Mph.

Tonight 19 Aug Grayson

Mostly clear. Lows in the lower 80s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Waterloo Lake Temperature Statistics

August Temperature

Sherman/Denison, Grayson County Airport (5.6 miles)

  • Lowest 3 August, 2026

    66.6 °F

  • Average August

    85.7 °F

  • Highest 7 August, 2026

    102.2 °F

Climate (2021–2026)

Sherman/Denison, Grayson County Airport (5.6 miles)

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  • Average Low 2021–2026

    56 °F

  • Average 2021–2026

    64.7 °F

  • Average High 2021–2026

    77.1 °F
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