Weather on September 29 in Ottawa
Historical weather data for September 29 in Ottawa, Canada
Based on 54 years of data from OTTAWA CDA RCS
About This Date
September 29th in Ottawa, Canada typically brings mild fall weather, with average highs around 18°C and lows near 8°C. Over 54 years of records, the warmest September 29th was in 1971 (21°C average), while the coldest was 1991 (4°C) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 44% of September 29th dates historically, with the wettest September 29th recording 2.67" of rain. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for September 29th in Ottawa? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 27°C (81°F) | 12°C (54°F) | -- |
| 2023 | 22°C (72°F) | 9°C (49°F) | 0 mm |
| 2022 | 14°C (58°F) | 7°C (45°F) | 0 mm |
| 2021 | 15°C (59°F) | 8°C (46°F) | 0 mm |
| 2020 | 21°C (70°F) | 13°C (56°F) | 25 mm |
| 2019 | 14°C (58°F) | 4°C (40°F) | 1 mm |
| 2018 | 16°C (61°F) | 8°C (46°F) | 2 mm |
| 2017 | 15°C (59°F) | 5°C (41°F) | 0 mm |
| 2016 | 19°C (66°F) | 8°C (47°F) | 0 mm |
| 2015 | 22°C (72°F) | 14°C (57°F) | 29 mm |
| 2014 | 23°C (73°F) | 14°C (58°F) | 0 mm |
| 2013 | 22°C (72°F) | 6°C (43°F) | 0 mm |
| 2012 | 18°C (64°F) | 3°C (37°F) | -- |
| 2011 | 25°C (77°F) | 17°C (63°F) | 7 mm |
| 2010 | 17°C (62°F) | 13°C (55°F) | 2 mm |
| 2009 | 14°C (58°F) | 6°C (43°F) | 26 mm |
| 2008 | 14°C (58°F) | 10°C (50°F) | 0 mm |
| 2007 | 17°C (62°F) | 6°C (42°F) | 0 mm |
| 2006 | 11°C (52°F) | 7°C (45°F) | 0 mm |
| 2005 | 18°C (65°F) | 3°C (38°F) | 9 mm |
| 2004 | 19°C (66°F) | 7°C (44°F) | 0 mm |
| 2003 | 17°C (63°F) | 7°C (45°F) | 5 mm |
| 2002 | 15°C (59°F) | 4°C (40°F) | 0 mm |
| 2001 | 18°C (65°F) | 7°C (45°F) | 0 mm |
| 2000 | 15°C (59°F) | -3°C (27°F) | 0 mm |
| 1999 | 23°C (74°F) | 18°C (64°F) | 50 mm |
| 1998 | 21°C (69°F) | 3°C (38°F) | 5 mm |
| 1997 | 14°C (58°F) | 11°C (52°F) | 38 mm |
| 1996 | 17°C (62°F) | 9°C (49°F) | 15 mm |
| 1995 | 19°C (67°F) | 1°C (33°F) | 0 mm |
| 1994 | 17°C (62°F) | 10°C (50°F) | 0 mm |
| 1993 | 9°C (49°F) | 4°C (40°F) | 0 mm |
| 1992 | 11°C (51°F) | 6°C (42°F) | 0 mm |
| 1991 | 8°C (47°F) | 1°C (33°F) | 3 mm |
| 1990 | 15°C (59°F) | 12°C (53°F) | 60 mm |
| 1989 | 18°C (65°F) | 10°C (50°F) | 0 mm |
| 1988 | 14°C (57°F) | 1°C (34°F) | 2 mm |
| 1987 | 24°C (75°F) | 13°C (56°F) | 33 mm |
| 1986 | 21°C (69°F) | 12°C (53°F) | 65 mm |
| 1985 | 23°C (74°F) | 8°C (46°F) | 0 mm |
| 1984 | 13°C (56°F) | 4°C (40°F) | 0 mm |
| 1983 | 22°C (72°F) | 4°C (39°F) | 0 mm |
| 1982 | 18°C (65°F) | 6°C (43°F) | 0 mm |
| 1981 | 11°C (51°F) | 4°C (39°F) | 0 mm |
| 1980 | 17°C (62°F) | -2°C (29°F) | 3 mm |
| 1979 | 22°C (72°F) | 11°C (51°F) | 1 mm |
| 1978 | 17°C (62°F) | 0°C (32°F) | 1 mm |
| 1977 | 13°C (55°F) | 6°C (42°F) | 13 mm |
| 1976 | 17°C (63°F) | 6°C (42°F) | 0 mm |
| 1975 | 23°C (73°F) | 7°C (45°F) | 0 mm |
| 1974 | 22°C (71°F) | 17°C (63°F) | 3 mm |
| 1973 | 18°C (64°F) | 10°C (50°F) | 0 mm |
| 1972 | 19°C (66°F) | 7°C (44°F) | 68 mm |
| 1971 | 27°C (81°F) | 16°C (60°F) | 0 mm |