Brighton Weather Forecast

    • 71
    • 98

    Chance Thunderstorms

    • 73
    • 94

    Chance Thunderstorms

    • 71
    • 96

    Mostly Sunny

    • 71
    • 93

    Mostly Sunny

    • 68
    • 92

    Partly Sunny

    • 61
    • 83

    Chance Rain Showers

Today 15 Sep Macoupin

Sunny. A chance of Showers and Thunderstorms this afternoon. Warmer with Highs in the upper 90s. Southwest Winds 10 to 15 Mph. Chance of rain 50 percent. Heat index Values up to 105.

Tonight 15 Sep Macoupin

Mostly cloudy with a chance of Showers and Thunderstorms. Lows around 70. Southeast Winds around 5 Mph, becoming northeast after midnight. Chance of rain 50 percent.

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Brighton Temperature Statistics

September Temperature

St. Louis Regional Airport (11.8 miles)

  • Lowest 8 September, 2026

    59 °F

  • Average September

    78.3 °F

  • Highest 5 September, 2026

    100.4 °F

Climate (2021–2026)

St. Louis Regional Airport (11.8 miles)

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  • Average Low 2021–2026

    46.6 °F

  • Average 2021–2026

    54.5 °F

  • Average High 2021–2026

    66.7 °F
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