Weather on September 1 in Ottawa
Historical weather data for September 1 in Ottawa, Canada
Based on 55 years of data from OTTAWA CDA
About This Date
September 1st in Ottawa, Canada typically brings pleasant fall weather, with average highs around 24°C and lows near 12°C. Over 55 years of records, the warmest September 1st was in 2010 (26°C average), while the coldest was 2017 (12°C) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 24% of September 1st dates historically, with the wettest September 1st recording 5.95" of rain. The last decade has been 3.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.0°F cooler on this date compared to 20-30 years ago.
Planning for September 1st in Ottawa? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip |
|---|---|---|---|
| 2025 | 27°C (80°F) | 11°C (51°F) | -- |
| 2024 | 24°C (76°F) | 13°C (56°F) | 1.12" |
| 2023 | 24°C (75°F) | 8°C (47°F) | 0" |
| 2022 | 18°C (65°F) | 10°C (50°F) | 0" |
| 2021 | 23°C (74°F) | 14°C (57°F) | 0" |
| 2020 | 24°C (76°F) | 13°C (56°F) | 0" |
| 2019 | 24°C (75°F) | 8°C (47°F) | 0.15" |
| 2018 | 27°C (81°F) | 15°C (59°F) | 0" |
| 2017 | 17°C (63°F) | 7°C (45°F) | 0" |
| 2016 | 23°C (73°F) | 13°C (56°F) | 0" |
| 2015 | 28°C (83°F) | 13°C (55°F) | 0" |
| 2014 | 28°C (82°F) | 18°C (64°F) | 0" |
| 2013 | 26°C (79°F) | 16°C (61°F) | 0" |
| 2012 | 25°C (77°F) | 16°C (60°F) | 0" |
| 2011 | 26°C (78°F) | 14°C (58°F) | 0" |
| 2010 | 32°C (90°F) | 21°C (69°F) | 0" |
| 2009 | 23°C (73°F) | 7°C (44°F) | 0" |
| 2008 | 28°C (83°F) | 11°C (51°F) | 0" |
| 2007 | 21°C (69°F) | 8°C (47°F) | 0" |
| 2006 | 23°C (73°F) | 9°C (49°F) | 0" |
| 2005 | 27°C (80°F) | 17°C (62°F) | 0" |
| 2004 | 19°C (67°F) | 14°C (57°F) | 0" |
| 2003 | 24°C (76°F) | 12°C (53°F) | 0" |
| 2002 | 27°C (81°F) | 13°C (56°F) | 0" |
| 2001 | 18°C (65°F) | 11°C (51°F) | 0" |
| 2000 | 29°C (85°F) | 18°C (65°F) | 0.92" |
| 1999 | 31°C (87°F) | 8°C (47°F) | 0" |
| 1998 | 24°C (76°F) | 11°C (51°F) | 0" |
| 1997 | 25°C (77°F) | 12°C (54°F) | 0" |
| 1996 | 28°C (83°F) | 12°C (54°F) | 0" |
| 1995 | 22°C (71°F) | 16°C (61°F) | 0" |
| 1994 | 18°C (65°F) | 11°C (51°F) | 0" |
| 1993 | 23°C (73°F) | 11°C (52°F) | 0" |
| 1992 | 18°C (64°F) | 9°C (48°F) | 0" |
| 1991 | 18°C (65°F) | 7°C (45°F) | 0" |
| 1990 | 27°C (81°F) | 13°C (56°F) | 0" |
| 1989 | 22°C (71°F) | 16°C (60°F) | 5.95" |
| 1988 | 25°C (77°F) | 9°C (49°F) | 0" |
| 1987 | 17°C (62°F) | 9°C (49°F) | 0.02" |
| 1986 | 24°C (75°F) | 8°C (47°F) | 0" |
| 1985 | 21°C (69°F) | 8°C (46°F) | 0.27" |
| 1984 | 22°C (71°F) | 12°C (54°F) | 0" |
| 1983 | 27°C (80°F) | 12°C (53°F) | 0" |
| 1982 | 21°C (69°F) | 8°C (46°F) | 2.62" |
| 1981 | 25°C (77°F) | 18°C (64°F) | 0.12" |
| 1980 | 28°C (82°F) | 19°C (66°F) | 0.64" |
| 1979 | 28°C (83°F) | 13°C (56°F) | 0" |
| 1978 | 23°C (73°F) | 8°C (46°F) | 0" |
| 1977 | 32°C (89°F) | 18°C (65°F) | 1.16" |
| 1976 | 16°C (60°F) | 13°C (56°F) | 0.58" |
| 1975 | 18°C (65°F) | 12°C (53°F) | 0.48" |
| 1974 | 19°C (67°F) | 8°C (46°F) | 0.05" |
| 1973 | 31°C (88°F) | 20°C (68°F) | 0" |
| 1972 | 29°C (84°F) | 14°C (57°F) | 0" |
| 1971 | 23°C (73°F) | 7°C (44°F) | 0" |