Ottawa Rainfall Forecast

Today 18 Sep
60%
Sat 19 Sep
70%
Sun 20 Sep
80%
Mon 21 Sep
65%
Tue 22 Sep
35%
Wed 23 Sep
5%
Thu 24 Sep
5%

Ottawa Rainfall Statistics

September Rainfall

Illinois Valley Regional Airport (15.5 miles)

Total Rainfall 2026
35in
Daily Average 2026
0.1in
Wettest Day 1 August, 2026
2.4in
Wet Days 2026
66/261 (25%)
Total Rainfall August
8.8in
Daily Average August
0.3in
Wettest Day 1 August, 2026
2.4in
Wet Days August
15/31 (48%)
Total Rainfall September
0.8in
Daily Average September
0.05in
Wettest Day 16 September, 2026
0.5in
Wet Days September
3/18 (17%)

Climate (2021–2025)

Illinois Valley Regional Airport (15.5 miles)

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Annual Average 2021–2025
34.5in
Monthly Average 2021–2026
3.2in
Daily Average 2021–2026
0.1in
Wettest Day 14 December, 2022
3.4in

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