O'Fallon Rainfall Forecast

Today 15 May
10%
Fri 16 May
65%
Sat 17 May
20%
Sun 18 May
20%
Mon 19 May
65%
Tue 20 May
75%
Wed 21 May
65%

O'Fallon Rainfall Statistics

May Rainfall

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

Total Rainfall 2025
15.7in
Daily Average 2025
0.1in
Wettest Day 4 April, 2025
4.2in
Wet Days 2025
35/135 (26%)
Total Rainfall April
11.1in
Daily Average April
0.4in
Wettest Day 4 April, 2025
4.2in
Wet Days April
14/30 (47%)
Total Rainfall May
0.9in
Daily Average May
0.1in
Wettest Day 3 May, 2025
0.5in
Wet Days May
5/15 (33%)

Climate (2010–Present)

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

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Annual Average 2020–2024
39.7in
Monthly Average 2020–2025
3.3in
Daily Average 2020–2025
0.1in
Wettest Day 4 April, 2025
4.2in

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