Collinsville Weather Forecast

    • 77
    • 101

    Hot

    • 77
    • 100

    Hot

    • 77
    • 99

    Hot

    • 77
    • 99

    Hot

    • 76
    • 99

    Hot

    • 74
    • 97

    Hot

Today 12 Sep Grayson

Sunny, hot with Highs around 100. South Winds 5 to 10 Mph. Heat index Values up to 107.

Tonight 12 Sep Grayson

Mostly clear. Lows in the upper 70s. South Winds 5 to 10 Mph.

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  • Temperature Real-Time

Collinsville Temperature Statistics

September Temperature

Gainesville, Gainesville Municipal Airport (17.4 miles)

  • Lowest 7 September, 2026

    73.6 °F

  • Average September

    87.3 °F

  • Highest 7 September, 2026

    100.8 °F

Climate (2021–2026)

Gainesville, Gainesville Municipal Airport (17.4 miles)

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  • Average Low 2021–2026

    53.8 °F

  • Average 2021–2026

    65 °F

  • Average High 2021–2026

    76.9 °F
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