Waterloo Lake Weather Forecast

    • 69
    • 78

    Slight Chance Thunderstorms

    • 63
    • 85

    Slight Chance Thunderstorms

    • 67
    • 85

    Chance Thunderstorms

    • 71
    • 87

    Slight Chance Thunderstorms

    • 59
    • 85

    Mostly Sunny

    • 64
    • 83

    Chance Rain Showers

Today 23 Apr Grayson

Cloudy in the Morning, then becoming partly sunny. Highs in the upper 70s. South Winds 10 to 15 Mph, increasing to 15 to 20 Mph in the afternoon.

Tonight 23 Apr Grayson

Mostly cloudy with a 20 percent chance of Showers and Thunderstorms. Lows in the upper 60s. South Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Waterloo Lake Temperature Statistics

April Temperature

Sherman/Denison, Grayson County Airport (5.6 miles)

  • Lowest 19 April, 2026

    38.1 °F

  • Average April

    66 °F

  • Highest 13 April, 2026

    84.2 °F

Climate (2021–Present)

Sherman/Denison, Grayson County Airport (5.6 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    64.5 °F

  • Average High 2021–2026

    76.9 °F
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