Weather on September 11 in Ottawa
Historical weather data for September 11 in Ottawa, Canada
Based on 54 years of data from OTTAWA CDA RCS
About This Date
September 11th in Ottawa, Canada typically brings pleasant fall weather, with average highs around 22°C and lows near 11°C. Over 54 years of records, the warmest September 11th was in 1983 (23°C average), while the coldest was 1976 (11°C) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 39% of September 11th dates historically, with the wettest September 11th recording 8.34" of rain. The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
Planning for September 11th in Ottawa? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 23°C (73°F) | 11°C (51°F) | -- |
| 2023 | 30°C (86°F) | 11°C (52°F) | 0 mm |
| 2022 | 28°C (82°F) | 13°C (55°F) | 0 mm |
| 2021 | 25°C (77°F) | 10°C (50°F) | 7 mm |
| 2020 | 17°C (63°F) | 6°C (43°F) | 0 mm |
| 2019 | 26°C (78°F) | 13°C (55°F) | 1 mm |
| 2018 | 19°C (66°F) | 13°C (55°F) | 5 mm |
| 2017 | 22°C (72°F) | 8°C (46°F) | 0 mm |
| 2016 | 19°C (66°F) | 14°C (57°F) | 0 mm |
| 2015 | 25°C (77°F) | 11°C (52°F) | 0 mm |
| 2014 | 23°C (73°F) | 15°C (59°F) | 1 mm |
| 2013 | 28°C (83°F) | 14°C (58°F) | -- |
| 2012 | 23°C (73°F) | 5°C (41°F) | 0 mm |
| 2011 | 25°C (77°F) | 7°C (44°F) | 0 mm |
| 2010 | 23°C (74°F) | 7°C (44°F) | 0 mm |
| 2009 | 22°C (72°F) | 8°C (46°F) | 0 mm |
| 2008 | 21°C (69°F) | 4°C (40°F) | 2 mm |
| 2007 | 17°C (62°F) | 13°C (55°F) | 22 mm |
| 2006 | 17°C (63°F) | 5°C (41°F) | 0 mm |
| 2005 | 24°C (76°F) | 8°C (47°F) | 0 mm |
| 2004 | 24°C (76°F) | 7°C (45°F) | 0 mm |
| 2003 | 29°C (85°F) | 14°C (58°F) | 0 mm |
| 2002 | 17°C (63°F) | 12°C (53°F) | 2 mm |
| 2001 | 23°C (73°F) | 13°C (56°F) | 0 mm |
| 2000 | 22°C (71°F) | 18°C (64°F) | 10 mm |
| 1999 | 23°C (74°F) | 12°C (53°F) | 0 mm |
| 1998 | 26°C (78°F) | 8°C (46°F) | 3 mm |
| 1997 | 18°C (65°F) | 16°C (60°F) | 65 mm |
| 1996 | 24°C (76°F) | 13°C (55°F) | 61 mm |
| 1995 | 22°C (71°F) | 3°C (38°F) | 0 mm |
| 1994 | 19°C (66°F) | 11°C (52°F) | 0 mm |
| 1993 | 15°C (59°F) | 8°C (46°F) | 0 mm |
| 1992 | 14°C (58°F) | 11°C (51°F) | 0 mm |
| 1991 | 18°C (64°F) | 9°C (49°F) | 0 mm |
| 1990 | 20°C (68°F) | 11°C (52°F) | 0 mm |
| 1989 | 20°C (68°F) | 15°C (59°F) | 0 mm |
| 1988 | 17°C (62°F) | 11°C (52°F) | 0 mm |
| 1987 | 22°C (72°F) | 13°C (56°F) | 21 mm |
| 1986 | 21°C (69°F) | 14°C (58°F) | 212 mm |
| 1985 | 16°C (60°F) | 6°C (42°F) | 0 mm |
| 1984 | 18°C (65°F) | 14°C (57°F) | 1 mm |
| 1983 | 26°C (78°F) | 21°C (69°F) | 0 mm |
| 1982 | 27°C (81°F) | 14°C (58°F) | 0 mm |
| 1981 | 14°C (58°F) | 12°C (53°F) | 17 mm |
| 1980 | 24°C (75°F) | 12°C (54°F) | 0 mm |
| 1979 | 15°C (59°F) | 6°C (43°F) | 0 mm |
| 1978 | 19°C (67°F) | 11°C (51°F) | 12 mm |
| 1977 | 17°C (63°F) | 8°C (47°F) | 0 mm |
| 1976 | 14°C (57°F) | 7°C (44°F) | 3 mm |
| 1975 | 27°C (80°F) | 8°C (47°F) | 73 mm |
| 1974 | 27°C (80°F) | 11°C (52°F) | 0 mm |
| 1973 | 21°C (70°F) | 12°C (53°F) | 3 mm |
| 1972 | 24°C (75°F) | 9°C (49°F) | 2 mm |
| 1971 | 23°C (73°F) | 14°C (57°F) | 5 mm |