Waterloo Lake Weather Forecast

    • 66
    • 81

    Increasing Clouds

    • 33
    • 76

    Breezy

    • 27
    • 43

    Partly Sunny

    • 35
    • 48

    Mostly Sunny

    • 38
    • 56

    Partly Sunny

    • 42
    • 60

    Partly Sunny

Today 27 Dec Grayson

Sunny. Highs in the lower 80s. South Winds around 10 Mph.

Tonight 27 Dec Grayson

Mostly cloudy. Lows in the mid 60s. South Winds 10 to 15 Mph.

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  • Temperature Real-Time

Waterloo Lake Temperature Statistics

December Temperature

Sherman/Denison, Grayson County Airport (5.6 miles)

  • Lowest 15 December, 2025

    22.5 °F

  • Average December

    47.7 °F

  • Highest 23 December, 2025

    80.6 °F

Climate (2020–Present)

Sherman/Denison, Grayson County Airport (5.6 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    64.1 °F

  • Average High 2020–2025

    76.3 °F
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