Denison Weather Forecast

    • 40
    • 49

    Increasing Clouds

    • 47
    • 58

    Mostly Cloudy

    • 55
    • 63

    Mostly Cloudy

    • 36
    • 64

    Mostly Sunny

    • 50
    • 59

    Mostly Sunny

    • 51
    • 74

    Mostly Sunny

    • 51
    • 67

    Partly Sunny

Today 15 Dec Grayson

Mostly sunny. Highs in the upper 40s. South Winds 5 to 10 Mph.

Tonight 15 Dec Grayson

Mostly cloudy. Not as cool with Lows in the upper 30s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Denison Temperature Statistics

December Temperature

Sherman/Denison, Grayson County Airport (7.5 miles)

  • Lowest 2 December, 2025

    23.7 °F

  • Average December

    41.8 °F

  • Highest 12 December, 2025

    68 °F

Climate (2020–Present)

Sherman/Denison, Grayson County Airport (7.5 miles)

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  • Average Low 2020–2025

    55.4 °F

  • Average 2020–2025

    64 °F

  • Average High 2020–2025

    76.3 °F
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