Hillsboro Weather Forecast

    • 66
    • 92

    Rain Showers Likely

    • 60
    • 79

    Chance Rain Showers

    • 54
    • 73

    Mostly Cloudy

    • 53
    • 72

    Partly Sunny

    • 55
    • 73

    Partly Sunny

    • 53
    • 75

    Partly Sunny

Today 20 Sep Jefferson

Partly sunny. Highs in the lower 90s. West Winds around 5 Mph.

Tonight 20 Sep Jefferson

Mostly cloudy with a chance of Thunderstorms. A chance of Showers in the Evening, then Showers likely after midnight. Lows in the upper 60s. North Winds around 5 Mph. Chance of rain 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Hillsboro Temperature Statistics

September Temperature

St. Louis, Spirit Of St. Louis Airport (29.2 miles)

  • Lowest 8 September, 2026

    59.6 °F

  • Average September

    81.7 °F

  • Highest 5 September, 2026

    102.7 °F

Climate (2021–2026)

St. Louis, Spirit Of St. Louis Airport (29.2 miles)

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  • Average Low 2021–2026

    46.2 °F

  • Average 2021–2026

    57.6 °F

  • Average High 2021–2026

    69 °F
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