Denison Weather Forecast

    • 75
    • 101

    Chance Thunderstorms

    • 73
    • 91

    Chance Thunderstorms

    • 71
    • 88

    Chance Thunderstorms

    • 70
    • 91

    Chance Thunderstorms

    • 72
    • 91

    Mostly Sunny

    • 74
    • 95

    Mostly Sunny

Today 31 Jul Grayson

Sunny. A slight chance of Showers and Thunderstorms in the afternoon. Hot with Highs around 100. West Winds around 5 Mph, becoming north in the afternoon. Chance of rain 20 percent.

Tonight 31 Jul Grayson

Mostly clear. Lows in the upper 70s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Denison Temperature Statistics

July Temperature

Sherman/Denison, Grayson County Airport (7.5 miles)

  • Lowest 1 July, 2025

    69.8 °F

  • Average July

    81.2 °F

  • Highest 23 July, 2025

    98.6 °F

Climate (2020–Present)

Sherman/Denison, Grayson County Airport (7.5 miles)

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  • Average Low 2020–2025

    55.2 °F

  • Average 2020–2025

    63.8 °F

  • Average High 2020–2025

    76.1 °F
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