Alton Rainfall Forecast

Today 19 May
85%
Wed 20 May
40%
Thu 21 May
10%
Fri 22 May
75%
Sat 23 May
20%
Sun 24 May
25%
Mon 25 May
30%

Alton Rainfall Statistics

May Rainfall

St. Louis Regional Airport (8.1 miles)

Total Rainfall 2026
11.8in
Daily Average 2026
0.1in
Wettest Day 15 April, 2026
1.7in
Wet Days 2026
28/139 (20%)
Total Rainfall April
4.9in
Daily Average April
0.2in
Wettest Day 15 April, 2026
1.7in
Wet Days April
11/30 (37%)
Total Rainfall May
0.9in
Daily Average May
0.1in
Wettest Day 8 May, 2026
0.3in
Wet Days May
7/19 (37%)

Climate (2010–Present)

St. Louis Regional Airport (8.1 miles)

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Annual Average 2021–2025
18.9in
Monthly Average 2021–2026
1.7in
Daily Average 2021–2026
0.1in
Wettest Day 5 November, 2024
4.8in

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