Dorchester Weather Forecast

    • 81
    • 103

    Hot

    • 81
    • 105

    Hot

    • 79
    • 104

    Hot

    • 76
    • 101

    Slight Chance Thunderstorms

    • 75
    • 100

    Slight Chance Thunderstorms

    • 77
    • 100

    Hot

Today 23 Aug Grayson

Mostly sunny. Hot with Highs around 105. Southeast Winds around 5 Mph. Heat index Values up to 109 in the afternoon.

Tonight 23 Aug Grayson

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 80s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Dorchester Temperature Statistics

August Temperature

Sherman/Denison, Grayson County Airport (12.4 miles)

  • Lowest 3 August, 2026

    66.6 °F

  • Average August

    86.7 °F

  • Highest 18 August, 2026

    105.8 °F

Climate (2021–2026)

Sherman/Denison, Grayson County Airport (12.4 miles)

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  • Average Low 2021–2026

    56 °F

  • Average 2021–2026

    64.7 °F

  • Average High 2021–2026

    77.2 °F
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