Waterloo Lake Weather Forecast

    • 79
    • 99

    Hot

    • 80
    • 102

    Hot

    • 79
    • 101

    Hot

    • 79
    • 98

    Hot

    • 79
    • 98

    Hot

    • 79
    • 98

    Hot

Today 20 Jul Grayson

Sunny, hot with Highs in the upper 90s. Southwest Winds around 5 Mph. Heat index Values up to 107.

Tonight 20 Jul Grayson

Mostly clear. Lows in the upper 70s. South Winds around 5 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 5 July, 2026

    68 °F

  • Average July

    81 °F

  • Highest 8 July, 2026

    98.6 °F

Climate (2021–2026)

Sherman/Denison, Grayson County Airport (5.6 miles)

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  • Average Low 2021–2026

    55.9 °F

  • Average 2021–2026

    64.6 °F

  • Average High 2021–2026

    77 °F
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