Weather on September 17 in Ottawa
Historical weather data for September 17 in Ottawa, Canada
Based on 55 years of data from OTTAWA CDA RCS
About This Date
September 17th in Ottawa, Canada typically brings mild fall weather, with average highs around 21°C and lows near 9°C. Over 55 years of records, the warmest September 17th was in 2018 (23°C average), while the coldest was 1973 (7°C) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 36% of September 17th dates historically, with the wettest September 17th recording 4.45" of rain. The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
Planning for September 17th in Ottawa? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 26°C (79°F) | 9°C (49°F) | -- |
| 2024 | 29°C (84°F) | 13°C (55°F) | 0 mm |
| 2023 | 24°C (75°F) | 13°C (55°F) | 0 mm |
| 2022 | 20°C (68°F) | 7°C (45°F) | 0 mm |
| 2021 | 27°C (80°F) | 10°C (50°F) | 0 mm |
| 2020 | 14°C (58°F) | 4°C (40°F) | 0 mm |
| 2019 | 22°C (72°F) | 6°C (42°F) | 0 mm |
| 2018 | 30°C (86°F) | 16°C (60°F) | 0 mm |
| 2017 | 28°C (83°F) | 16°C (60°F) | 0 mm |
| 2016 | 23°C (73°F) | 11°C (52°F) | 113 mm |
| 2015 | 28°C (83°F) | 15°C (59°F) | 0 mm |
| 2014 | 18°C (65°F) | 6°C (42°F) | 20 mm |
| 2013 | 18°C (64°F) | 2°C (35°F) | 0 mm |
| 2012 | 26°C (78°F) | 8°C (46°F) | 1 mm |
| 2011 | 18°C (64°F) | 1°C (34°F) | 0 mm |
| 2010 | 18°C (64°F) | 6°C (43°F) | 0 mm |
| 2009 | 20°C (68°F) | 6°C (42°F) | 0 mm |
| 2008 | 22°C (71°F) | 8°C (47°F) | 2 mm |
| 2007 | 20°C (68°F) | 3°C (37°F) | 0 mm |
| 2006 | 23°C (74°F) | 12°C (54°F) | 0 mm |
| 2005 | 18°C (64°F) | 16°C (60°F) | 17 mm |
| 2004 | 17°C (62°F) | 12°C (53°F) | 0 mm |
| 2003 | 24°C (75°F) | 7°C (45°F) | 0 mm |
| 2002 | 24°C (76°F) | 9°C (49°F) | 0 mm |
| 2001 | 24°C (76°F) | 7°C (44°F) | 0 mm |
| 2000 | 21°C (70°F) | 7°C (45°F) | 6 mm |
| 1999 | 19°C (67°F) | 12°C (54°F) | 0 mm |
| 1998 | 23°C (73°F) | 7°C (45°F) | 0 mm |
| 1997 | 22°C (71°F) | 8°C (46°F) | 19 mm |
| 1996 | 22°C (71°F) | 13°C (55°F) | 0 mm |
| 1995 | 20°C (68°F) | 16°C (60°F) | 0 mm |
| 1994 | 23°C (74°F) | 17°C (62°F) | 1 mm |
| 1993 | 14°C (58°F) | 8°C (46°F) | 11 mm |
| 1992 | 23°C (73°F) | 19°C (66°F) | 4 mm |
| 1991 | 24°C (75°F) | 17°C (63°F) | 0 mm |
| 1990 | 12°C (54°F) | 4°C (40°F) | 0 mm |
| 1989 | 18°C (64°F) | 13°C (55°F) | 1 mm |
| 1988 | 16°C (60°F) | 9°C (48°F) | 15 mm |
| 1987 | 18°C (64°F) | 9°C (49°F) | 0 mm |
| 1986 | 14°C (58°F) | 2°C (36°F) | 0 mm |
| 1985 | 24°C (75°F) | 5°C (41°F) | 0 mm |
| 1984 | 20°C (68°F) | 3°C (38°F) | 0 mm |
| 1983 | 20°C (68°F) | 11°C (52°F) | 7 mm |
| 1982 | 16°C (61°F) | 8°C (46°F) | 42 mm |
| 1981 | 17°C (63°F) | 6°C (43°F) | 6 mm |
| 1980 | 21°C (69°F) | 13°C (55°F) | 11 mm |
| 1979 | 24°C (76°F) | 10°C (50°F) | 0 mm |
| 1978 | 14°C (57°F) | 3°C (38°F) | 0 mm |
| 1977 | 18°C (64°F) | 12°C (54°F) | 9 mm |
| 1976 | 25°C (77°F) | 16°C (60°F) | 76 mm |
| 1975 | 18°C (65°F) | 13°C (55°F) | 0 mm |
| 1974 | 19°C (67°F) | 8°C (46°F) | 3 mm |
| 1973 | 13°C (55°F) | 0°C (32°F) | 31 mm |
| 1972 | 27°C (80°F) | 16°C (61°F) | 0 mm |
| 1971 | 15°C (59°F) | 13°C (56°F) | 0 mm |