Waterloo Lake Weather Forecast

    • 42
    • 56

    Decreasing Clouds

    • 29
    • 53

    Mostly Sunny

    • 34
    • 50

    Mostly Sunny

    • 44
    • 60

    Mostly Sunny

    • 41
    • 63

    Mostly Sunny

    • 40
    • 65

    Mostly Sunny

Today 6 Dec Grayson

Areas of dense fog this morning. Partly sunny. Highs in the mid 50s. Southeast Winds 5 to 10 Mph.

Tonight 6 Dec Grayson

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 40s. Southeast Winds around 5 Mph, becoming north after midnight.

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Waterloo Lake Temperature Statistics

December Temperature

Sherman/Denison, Grayson County Airport (5.6 miles)

  • Lowest 2 December, 2025

    23.7 °F

  • Average December

    37.1 °F

  • Highest 3 December, 2025

    59 °F

Climate (2020–Present)

Sherman/Denison, Grayson County Airport (5.6 miles)

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  • Average Low 2020–2025

    55.4 °F

  • Average 2020–2025

    64.1 °F

  • Average High 2020–2025

    76.3 °F
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