Ottawa Rainfall Forecast

Today 4 May
15%
Tue 5 May
60%
Wed 6 May
20%
Thu 7 May
5%
Fri 8 May
20%
Sat 9 May
20%
Sun 10 May
25%

Ottawa Rainfall Statistics

May Rainfall

Illinois Valley Regional Airport (15.5 miles)

Total Rainfall 2026
10.2in
Daily Average 2026
0.1in
Wettest Day 2 April, 2026
2.3in
Wet Days 2026
19/124 (15%)
Total Rainfall April
6.6in
Daily Average April
0.4in
Wettest Day 2 April, 2026
2.3in
Wet Days April
10/30 (33%)
Total Rainfall May
–
Daily Average May
–
Wettest Day 4 May, 2026
–
Wet Days May
–

Climate (2010–Present)

Illinois Valley Regional Airport (15.5 miles)

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Annual Average 2021–2025
34.5in
Monthly Average 2021–2026
3in
Daily Average 2021–2026
0.1in
Wettest Day 14 December, 2022
3.4in

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