Environment Canada says Ottawa received 56 mm of rain in September, well below the normal rainfall of 90 mm in the month.

Ottawa has seen below normal precipitation in September over the last four years. In 2025, a total of 31.5 mm of rain was recorded at the Ottawa Airport, with 44.3 mm of rain in September 2024, 24.7 mm in September 2023 and 65.3 mm of rain in September 2022.