Waterloo Lake Weather Forecast

    • 66
    • 78

    Thunderstorms Likely

    • 67
    • 85

    Decreasing Clouds

    • 53
    • 82

    Rain Showers Likely

    • 45
    • 65

    Chance Rain Showers

    • 51
    • 71

    Partly Sunny

    • 53
    • 66

    Slight Chance Thunderstorms

    • 60
    • 69

    Mostly Cloudy

Today 15 Apr Grayson

Partly sunny with Showers and Thunderstorms likely. Highs in the upper 70s. South Winds 10 to 15 Mph. Chance of rain 60 percent.

Tonight 15 Apr Grayson

Mostly cloudy with Showers likely with a chance of Thunderstorms this Evening, then partly cloudy after midnight. Lows in the mid 60s. South Winds around 10 Mph. Chance of rain 60 percent.

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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 5 April, 2026

    42.6 °F

  • Average April

    66.2 °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

    55.7 °F

  • Average 2021–2026

    64.5 °F

  • Average High 2021–2026

    76.8 °F
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