Illinois River State Park Rainfall Forecast

Today 11 May
No Rain
Tue 12 May
35%
Wed 13 May
40%
Thu 14 May
10%
Fri 15 May
10%
Sat 16 May
5%
Sun 17 May
No Rain

Illinois River State Park Rainfall Statistics

May Rainfall

Brookings, Brookings Airport (32.3 miles)

Total Rainfall 2026
1.5in
Daily Average 2026
0.01in
Wettest Day 1 April, 2026
0.5in
Wet Days 2026
23/131 (18%)
Total Rainfall April
0.9in
Daily Average April
0.03in
Wettest Day 1 April, 2026
0.5in
Wet Days April
8/30 (27%)
Total Rainfall May
0.1in
Daily Average May
0.01in
Wettest Day 6 May, 2026
0.02in
Wet Days May
3/11 (27%)

Climate (2010–Present)

Brookings, Brookings Airport (32.3 miles)

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Annual Average 2021–2025
30.8in
Monthly Average 2021–2026
2.5in
Daily Average 2021–2026
0.1in
Wettest Day 13 June, 2021
2.6in

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