Waterloo Lake Weather Forecast

    • 74
    • 87

    Decreasing Clouds

    • 77
    • 93

    Partly Sunny

    • 74
    • 90

    Rain Showers Likely

    • 73
    • 88

    Chance Thunderstorms

    • 72
    • 86

    Chance Thunderstorms

    • 74
    • 88

    Slight Chance Thunderstorms

Today 20 Jun Grayson

Partly sunny with a 20 percent chance of Showers and Thunderstorms. Highs in the upper 80s. Southeast Winds around 5 Mph.

Tonight 20 Jun Grayson

Partly cloudy in the Evening, then becoming mostly cloudy. Humid with Lows in the mid 70s. Southeast Winds 5 to 10 Mph, becoming south 10 to 15 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Waterloo Lake Temperature Statistics

June Temperature

Sherman/Denison, Grayson County Airport (5.6 miles)

  • Lowest 14 June, 2026

    64.4 °F

  • Average June

    78.2 °F

  • Highest 1 June, 2026

    93.2 °F

Climate (2021–2026)

Sherman/Denison, Grayson County Airport (5.6 miles)

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  • Average Low 2021–2026

    55.9 °F

  • Average 2021–2026

    64.6 °F

  • Average High 2021–2026

    77 °F
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