Weather on September 25 in Ottawa
Historical weather data for September 25 in Ottawa, Canada
Based on 54 years of data from OTTAWA CDA
About This Date
September 25th in Ottawa, Canada typically brings mild fall weather, with average highs around 19°C and lows near 8°C. Over 54 years of records, the warmest September 25th was in 2017 (24°C average), while the coldest was 2000 (7°C) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 48% of September 25th dates historically, with the wettest September 25th recording 3.02" of rain. The last decade has been 4.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.8°F warmer on this date compared to 20-30 years ago.
Planning for September 25th in Ottawa? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip |
|---|---|---|---|
| 2025 | 19°C (67°F) | 15°C (59°F) | -- |
| 2023 | 26°C (79°F) | 12°C (54°F) | 0" |
| 2022 | 18°C (64°F) | 9°C (48°F) | 0.48" |
| 2021 | 23°C (73°F) | 7°C (45°F) | 0" |
| 2020 | 18°C (64°F) | 11°C (51°F) | 0" |
| 2019 | 23°C (74°F) | 5°C (41°F) | 0.2" |
| 2018 | 22°C (71°F) | 7°C (45°F) | 0.4" |
| 2017 | 33°C (91°F) | 16°C (61°F) | 0" |
| 2016 | 17°C (63°F) | 3°C (38°F) | 0" |
| 2015 | 17°C (62°F) | 7°C (44°F) | 0" |
| 2014 | 24°C (75°F) | 7°C (45°F) | 0" |
| 2013 | 21°C (69°F) | 3°C (37°F) | 0" |
| 2012 | 21°C (69°F) | 10°C (50°F) | 0" |
| 2011 | 25°C (77°F) | 12°C (53°F) | 0" |
| 2010 | 19°C (67°F) | 14°C (58°F) | 1.2" |
| 2009 | 16°C (60°F) | 7°C (44°F) | 0" |
| 2008 | 26°C (79°F) | 7°C (45°F) | 0" |
| 2007 | 29°C (84°F) | 13°C (55°F) | 0" |
| 2006 | 16°C (60°F) | 3°C (38°F) | 0.44" |
| 2005 | 19°C (67°F) | 9°C (48°F) | 0.84" |
| 2004 | 24°C (75°F) | 18°C (64°F) | 0" |
| 2003 | 18°C (65°F) | 12°C (53°F) | 0.24" |
| 2002 | 22°C (71°F) | 7°C (44°F) | 0" |
| 2001 | 16°C (60°F) | 11°C (52°F) | 0.26" |
| 2000 | 14°C (57°F) | 0°C (32°F) | 0" |
| 1999 | 16°C (60°F) | 6°C (43°F) | 0" |
| 1998 | 22°C (72°F) | 10°C (50°F) | 0.02" |
| 1997 | 14°C (58°F) | 6°C (42°F) | 0.18" |
| 1996 | 14°C (58°F) | 6°C (42°F) | 0" |
| 1995 | 14°C (57°F) | 3°C (37°F) | 0.1" |
| 1994 | 19°C (67°F) | 15°C (59°F) | 0.26" |
| 1993 | 21°C (69°F) | 7°C (44°F) | 0.66" |
| 1992 | 19°C (66°F) | 4°C (39°F) | 0" |
| 1991 | 12°C (53°F) | 8°C (46°F) | 0.4" |
| 1990 | 19°C (67°F) | 8°C (47°F) | 0.2" |
| 1989 | 18°C (64°F) | 1°C (34°F) | 0" |
| 1988 | 21°C (69°F) | 4°C (39°F) | 0" |
| 1987 | 12°C (54°F) | 3°C (38°F) | 0.02" |
| 1986 | 19°C (67°F) | 8°C (47°F) | 0.02" |
| 1985 | 19°C (67°F) | 3°C (38°F) | 0" |
| 1984 | 23°C (73°F) | 16°C (61°F) | 0.32" |
| 1983 | 19°C (67°F) | 3°C (38°F) | 0.16" |
| 1982 | 19°C (67°F) | 12°C (54°F) | 0.02" |
| 1981 | 18°C (65°F) | 8°C (47°F) | 0" |
| 1980 | 13°C (55°F) | 4°C (40°F) | 1.22" |
| 1979 | 21°C (69°F) | 8°C (46°F) | 0" |
| 1978 | 12°C (53°F) | 8°C (46°F) | 0" |
| 1977 | 11°C (52°F) | 8°C (47°F) | 0.28" |
| 1976 | 13°C (55°F) | 3°C (38°F) | 0.03" |
| 1975 | 12°C (54°F) | 7°C (44°F) | 3.02" |
| 1974 | 11°C (52°F) | 7°C (45°F) | 0.48" |
| 1973 | 17°C (63°F) | 7°C (45°F) | 0" |
| 1972 | 22°C (71°F) | 12°C (54°F) | 0.25" |
| 1971 | 18°C (64°F) | 9°C (49°F) | 0" |