Weather on September 19 in Ottawa
Historical weather data for September 19 in Ottawa, Canada
Based on 55 years of data from OTTAWA CDA RCS
About This Date
September 19th 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 19th was in 2017 (22°C average), while the coldest was 2014 (7°C) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 38% of September 19th dates historically, with the wettest September 19th recording 1.65" of rain. The last decade has been 3.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.5°F cooler on this date compared to 20-30 years ago.
Planning for September 19th in Ottawa? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 21°C (70°F) | 9°C (48°F) | -- |
| 2024 | 28°C (82°F) | 13°C (55°F) | 0 mm |
| 2023 | 19°C (67°F) | 11°C (51°F) | 21 mm |
| 2022 | 14°C (57°F) | 11°C (51°F) | 13 mm |
| 2021 | 21°C (70°F) | 8°C (47°F) | 0 mm |
| 2020 | 13°C (56°F) | 2°C (35°F) | 0 mm |
| 2019 | 24°C (75°F) | 7°C (45°F) | 0 mm |
| 2018 | 18°C (64°F) | 13°C (55°F) | 2 mm |
| 2017 | 28°C (82°F) | 16°C (60°F) | 0 mm |
| 2016 | 26°C (78°F) | 14°C (57°F) | 0 mm |
| 2015 | 24°C (76°F) | 12°C (53°F) | 5 mm |
| 2014 | 16°C (60°F) | -1°C (31°F) | 0 mm |
| 2013 | 25°C (77°F) | 4°C (40°F) | 0 mm |
| 2012 | 14°C (58°F) | 7°C (45°F) | 0 mm |
| 2011 | 21°C (70°F) | 5°C (41°F) | 14 mm |
| 2010 | 18°C (65°F) | 6°C (42°F) | 0 mm |
| 2009 | 17°C (63°F) | 4°C (40°F) | 0 mm |
| 2008 | 19°C (67°F) | 1°C (33°F) | 0 mm |
| 2007 | 27°C (80°F) | 7°C (44°F) | 0 mm |
| 2006 | 22°C (71°F) | 11°C (52°F) | 34 mm |
| 2005 | 24°C (75°F) | 15°C (59°F) | 0 mm |
| 2004 | 17°C (63°F) | 6°C (42°F) | 0 mm |
| 2003 | 26°C (78°F) | 15°C (59°F) | 22 mm |
| 2002 | 28°C (82°F) | 12°C (53°F) | 0 mm |
| 2001 | 24°C (75°F) | 12°C (53°F) | 23 mm |
| 2000 | 26°C (78°F) | 9°C (49°F) | 0 mm |
| 1999 | 24°C (75°F) | 8°C (47°F) | 0 mm |
| 1998 | 28°C (82°F) | 11°C (52°F) | 0 mm |
| 1997 | 24°C (75°F) | 14°C (57°F) | 24 mm |
| 1996 | 22°C (71°F) | 11°C (51°F) | 0 mm |
| 1995 | 18°C (65°F) | 1°C (34°F) | 0 mm |
| 1994 | 18°C (65°F) | 8°C (46°F) | 0 mm |
| 1993 | 12°C (53°F) | 4°C (40°F) | 0 mm |
| 1992 | 16°C (60°F) | 11°C (52°F) | 0 mm |
| 1991 | 16°C (61°F) | 12°C (53°F) | 0 mm |
| 1990 | 13°C (56°F) | 3°C (37°F) | 14 mm |
| 1989 | 21°C (69°F) | 12°C (53°F) | 0 mm |
| 1988 | 23°C (74°F) | 9°C (49°F) | 1 mm |
| 1987 | 16°C (60°F) | 12°C (53°F) | 25 mm |
| 1986 | 19°C (66°F) | 12°C (53°F) | 1 mm |
| 1985 | 28°C (82°F) | 14°C (57°F) | 0 mm |
| 1984 | 23°C (73°F) | 11°C (52°F) | 0 mm |
| 1983 | 22°C (72°F) | 14°C (58°F) | 2 mm |
| 1982 | 16°C (61°F) | 3°C (37°F) | 0 mm |
| 1981 | 18°C (64°F) | 5°C (41°F) | 6 mm |
| 1980 | 19°C (66°F) | 8°C (46°F) | 0 mm |
| 1979 | 11°C (52°F) | 4°C (39°F) | 0 mm |
| 1978 | 20°C (68°F) | 7°C (45°F) | 0 mm |
| 1977 | 19°C (67°F) | 14°C (57°F) | 6 mm |
| 1976 | 26°C (78°F) | 14°C (57°F) | 24 mm |
| 1975 | 21°C (70°F) | 13°C (56°F) | 20 mm |
| 1974 | 21°C (70°F) | 2°C (36°F) | 8 mm |
| 1973 | 18°C (65°F) | 6°C (43°F) | 8 mm |
| 1972 | 18°C (64°F) | 11°C (51°F) | 0 mm |
| 1971 | 18°C (64°F) | 9°C (48°F) | 42 mm |