Waterloo Lake Weather Forecast

    • 48
    • 70

    Partly Sunny

    • 51
    • 74

    Mostly Sunny

    • 54
    • 76

    Mostly Sunny

    • 58
    • 79

    Sunny

    • 60
    • 82

    Mostly Sunny

    • 63
    • 84

    Partly Sunny

Today 18 Oct Grayson

Mostly sunny. Highs around 70. Southeast Winds around 5 Mph.

Tonight 18 Oct Grayson

Mostly clear. Lows in the upper 40s. Southeast Winds around 5 Mph.

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Waterloo Lake Temperature Statistics

October Temperature

Sherman/Denison, Grayson County Airport (5.6 miles)

  • Lowest 16 October, 2026

    51.6 °F

  • Average October

    71.7 °F

  • Highest 13 October, 2026

    91.4 °F

Climate (2021–2026)

Sherman/Denison, Grayson County Airport (5.6 miles)

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  • Average Low 2021–2026

    56.2 °F

  • Average 2021–2026

    64.9 °F

  • Average High 2021–2026

    77.3 °F
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