Dorchester Weather Forecast

    • 70
    • 95

    Chance Thunderstorms

    • 70
    • 92

    Chance Thunderstorms

    • 66
    • 89

    Partly Sunny

    • 68
    • 90

    Partly Sunny

    • 69
    • 92

    Partly Sunny

    • 70
    • 92

    Mostly Cloudy

Today 20 Sep Grayson

Mostly sunny. A 40 percent chance of Showers and Thunderstorms this afternoon. Highs in the mid 90s. South Winds 5 to 10 Mph.

Tonight 20 Sep Grayson

Mostly cloudy with a 50 percent chance of Showers and Thunderstorms. Lows around 70. East Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Dorchester Temperature Statistics

September Temperature

Sherman/Denison, Grayson County Airport (12.4 miles)

  • Lowest 11 September, 2026

    71.1 °F

  • Average September

    86 °F

  • Highest 12 September, 2026

    102.2 °F

Climate (2021–2026)

Sherman/Denison, Grayson County Airport (12.4 miles)

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  • Average Low 2021–2026

    56.1 °F

  • Average 2021–2026

    64.9 °F

  • Average High 2021–2026

    77.3 °F
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