Weather on October 21 in Ottawa
Historical weather data for October 21 in Ottawa, Canada
Based on 54 years of data from OTTAWA CDA
About This Date
October 21st in Ottawa, Canada typically brings cool fall weather, with average highs around 12°C and lows near 3°C. Over 54 years of records, the warmest October 21st was in 1979 (20°C average), while the coldest was 1974 (1°C) — a 34°F range across recorded history. Precipitation has occurred on 46% of recorded October 21st dates, with snow falling 6% of the time (heaviest snowfall: 3.7"). The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Ottawa? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip |
|---|---|---|---|
| 2025 | 14°C (57°F) | 8°C (47°F) | -- |
| 2023 | 14°C (57°F) | 10°C (50°F) | 0.66" |
| 2022 | 14°C (57°F) | -1°C (31°F) | 0" |
| 2021 | 16°C (61°F) | 10°C (50°F) | 1.56" |
| 2020 | 16°C (60°F) | 3°C (38°F) | 1.18" |
| 2019 | 16°C (61°F) | 1°C (33°F) | 0" |
| 2018 | 4°C (39°F) | -1°C (31°F) | 0" |
| 2017 | 22°C (72°F) | 6°C (42°F) | 0" |
| 2016 | 10°C (50°F) | 6°C (42°F) | 2.27" |
| 2015 | 11°C (52°F) | 3°C (37°F) | 0.07" |
| 2014 | 8°C (46°F) | 4°C (40°F) | -- |
| 2013 | 14°C (57°F) | 1°C (33°F) | 0.36" |
| 2012 | 13°C (55°F) | 8°C (46°F) | 0" |
| 2011 | 12°C (54°F) | 8°C (46°F) | 0.32" |
| 2010 | 8°C (46°F) | 4°C (40°F) | 0" |
| 2009 | 9°C (49°F) | 7°C (45°F) | 0.66" |
| 2008 | 8°C (47°F) | 5°C (41°F) | 0.22" |
| 2007 | 22°C (72°F) | 8°C (47°F) | 0" |
| 2006 | 7°C (45°F) | 2°C (36°F) | 0" |
| 2005 | 9°C (49°F) | -2°C (29°F) | 0" |
| 2004 | 9°C (48°F) | 3°C (37°F) | 0" |
| 2003 | -- | 3°C (37°F) | 0.12" |
| 2002 | 8°C (46°F) | 1°C (34°F) | 0" |
| 2001 | 12°C (54°F) | 6°C (42°F) | 0.2" |
| 2000 | 16°C (61°F) | 3°C (37°F) | 0" |
| 1999 | 13°C (56°F) | 1°C (33°F) | 0.02" |
| 1998 | 8°C (47°F) | 1°C (34°F) | 0" |
| 1997 | 6°C (43°F) | -1°C (31°F) | 0.86" |
| 1996 | 8°C (46°F) | 6°C (43°F) | 1.24" |
| 1995 | 17°C (62°F) | 11°C (51°F) | 5.39" |
| 1994 | 18°C (64°F) | 11°C (51°F) | 0" |
| 1993 | 17°C (63°F) | 8°C (46°F) | 0" |
| 1992 | 6°C (43°F) | 1°C (33°F) | 0" |
| 1991 | 10°C (50°F) | 1°C (33°F) | 0.1" |
| 1990 | 17°C (63°F) | -1°C (30°F) | 0" |
| 1989 | 6°C (42°F) | 3°C (37°F) | 0.18" |
| 1988 | 12°C (53°F) | -2°C (28°F) | 0.4" |
| 1987 | 8°C (46°F) | 3°C (37°F) | 0.02" |
| 1986 | 13°C (56°F) | 5°C (41°F) | 0" |
| 1985 | 12°C (54°F) | -1°C (31°F) | 0" |
| 1984 | 13°C (55°F) | 8°C (47°F) | 0.3" |
| 1983 | 8°C (46°F) | -3°C (27°F) | 0" |
| 1982 | 8°C (46°F) | 4°C (40°F) | 0" |
| 1981 | 7°C (44°F) | 3°C (38°F) | 0.5" |
| 1980 | 8°C (46°F) | -1°C (30°F) | 0.12" |
| 1979 | 24°C (76°F) | 15°C (59°F) | 0" |
| 1978 | 19°C (66°F) | 4°C (39°F) | 0" |
| 1977 | 18°C (65°F) | 1°C (34°F) | 0.72" |
| 1976 | 7°C (45°F) | 2°C (35°F) | 0.08" |
| 1975 | 17°C (62°F) | 8°C (47°F) | 0" |
| 1974 | 6°C (43°F) | -4°C (25°F) | 0" |
| 1973 | 11°C (52°F) | -1°C (30°F) | 0" |
| 1972 | 8°C (47°F) | -1°C (30°F) | 0.28" |
| 1971 | 14°C (57°F) | 6°C (42°F) | 0" |