O'Fallon Rainfall Forecast

  • 15%
  • No Rain
  • 55%
  • 45%
  • 35%
  • 60%
  • 65%
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  • Rainfall Probability Forecast NOAA

  • Rain Today Real-Time

O'Fallon Rainfall Statistics

May Rainfall

St. Louis, Spirit Of St. Louis Airport (10.6 miles)

  • Total Rainfall May

    1.2in

  • Daily Average May

    0.1in

  • Wettest Day 5 May, 2026

    0.6in

  • Wet Days May

    5/13 (38%)

Climate (2010–Present)

St. Louis, Spirit Of St. Louis Airport (10.6 miles)

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  • Annual Average 2021–2025

    38.3in

  • Monthly Average 2021–2026

    3.2in

  • Daily Average 2021–2026

    0.1in

  • Wettest Day 4 April, 2025

    4.2in
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