Williamson Airport Rainfall Forecast

Today 26 May
15%
Wed 27 May
60%
Thu 28 May
15%
Fri 29 May
No Rain
Sat 30 May
5%
Sun 31 May
5%
Mon 1 Jun
5%

Williamson Airport Rainfall Statistics

May Rainfall

Mattoon / Charleston, Coles County Memorial Airport (13 miles)

Total Rainfall 2026
18.5in
Daily Average 2026
0.1in
Wettest Day 27 April, 2026
3in
Wet Days 2026
43/146 (29%)
Total Rainfall April
6.3in
Daily Average April
0.2in
Wettest Day 27 April, 2026
3in
Wet Days April
13/30 (43%)
Total Rainfall May
3.6in
Daily Average May
0.2in
Wettest Day 5 May, 2026
1.5in
Wet Days May
9/26 (35%)

Climate (2010–Present)

Mattoon / Charleston, Coles County Memorial Airport (13 miles)

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Annual Average 2021–2025
35.9in
Monthly Average 2021–2026
3.1in
Daily Average 2021–2026
0.1in
Wettest Day 9 July, 2024
3.6in

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