O'Fallon Rainfall Forecast

Today 14 May
No Rain
Fri 15 May
50%
Sat 16 May
50%
Sun 17 May
30%
Mon 18 May
35%
Tue 19 May
70%
Wed 20 May
65%

O'Fallon Rainfall Statistics

May Rainfall

Belleville, Scott AFB/MidAmerica Airport (4.3 miles)

Total Rainfall 2026
10.6in
Daily Average 2026
0.1in
Wettest Day 14 February, 2026
1in
Wet Days 2026
37/134 (28%)
Total Rainfall April
4.6in
Daily Average April
0.2in
Wettest Day 27 April, 2026
1in
Wet Days April
11/30 (37%)
Total Rainfall May
1.3in
Daily Average May
0.1in
Wettest Day 8 May, 2026
0.5in
Wet Days May
8/14 (57%)

Climate (2010–Present)

Belleville, Scott AFB/MidAmerica Airport (4.3 miles)

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Annual Average 2021–2025
33.5in
Monthly Average 2021–2026
2.8in
Daily Average 2021–2026
0.1in
Wettest Day 11 May, 2022
6.4in

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