Waterloo Lake Weather Forecast

    • 56
    • 73

    Increasing Clouds

    • 62
    • 80

    Partly Sunny

    • 66
    • 84

    Chance Thunderstorms

    • 57
    • 81

    Chance Rain Showers

    • 62
    • 80

    Sunny

    • 68
    • 87

    Mostly Sunny

Today 7 May Grayson

Mostly sunny. Highs in the lower 70s. North Winds around 5 Mph.

Tonight 7 May Grayson

Mostly cloudy. Lows in the upper 40s. North Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Waterloo Lake Temperature Statistics

May Temperature

Sherman/Denison, Grayson County Airport (5.6 miles)

  • Lowest 2 May, 2026

    44.6 °F

  • Average May

    63.3 °F

  • Highest 4 May, 2026

    80.6 °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

    64.6 °F

  • Average High 2021–2026

    76.9 °F
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