Weather on April 21 in Ottawa
Historical weather data for April 21 in Ottawa, Canada
Based on 56 years of data from OTTAWA CDA RCS
About This Date
April 21st in Ottawa, Canada typically brings cool spring weather, with average highs around 13°C and lows near 3°C. Over 56 years of records, the warmest April 21st was in 1987 (21°C average), while the coldest was 1981 (-2°C) — a 40°F range across recorded history. Precipitation has occurred on 48% of recorded April 21st dates, with snow falling 2% of the time. The last decade has been 7.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 7.1°F cooler on this date compared to 20-30 years ago.
Planning for April 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 (mm) |
|---|---|---|---|
| 2026 | 8°C (47°F) | -5°C (23°F) | -- |
| 2025 | 12°C (53°F) | 0°C (32°F) | 0 mm |
| 2024 | 9°C (49°F) | -1°C (31°F) | 1 mm |
| 2023 | 15°C (59°F) | 3°C (37°F) | 0 mm |
| 2022 | 12°C (54°F) | 2°C (35°F) | 8 mm |
| 2021 | 3°C (37°F) | -3°C (27°F) | 2 mm |
| 2020 | 6°C (43°F) | -4°C (24°F) | 11 mm |
| 2019 | 13°C (55°F) | 6°C (43°F) | 0 mm |
| 2018 | 12°C (54°F) | -1°C (30°F) | 0 mm |
| 2017 | 14°C (57°F) | 6°C (43°F) | 24 mm |
| 2016 | 22°C (71°F) | 1°C (33°F) | 0 mm |
| 2015 | 12°C (54°F) | 4°C (40°F) | 11 mm |
| 2014 | 18°C (65°F) | 7°C (45°F) | 12 mm |
| 2013 | 7°C (44°F) | -3°C (26°F) | 0 mm |
| 2012 | 6°C (43°F) | 3°C (38°F) | 9 mm |
| 2011 | 8°C (47°F) | -1°C (30°F) | 0 mm |
| 2010 | 18°C (64°F) | 4°C (39°F) | 0 mm |
| 2009 | 8°C (46°F) | 4°C (39°F) | 22 mm |
| 2008 | 24°C (76°F) | 8°C (47°F) | 0 mm |
| 2007 | 23°C (74°F) | 3°C (38°F) | 0 mm |
| 2006 | 19°C (66°F) | 7°C (44°F) | 0 mm |
| 2005 | 11°C (51°F) | -1°C (31°F) | 0 mm |
| 2004 | 22°C (71°F) | 4°C (40°F) | 20 mm |
| 2003 | 15°C (59°F) | 12°C (53°F) | 34 mm |
| 2002 | 5°C (41°F) | -- | 0 mm |
| 2001 | 19°C (66°F) | 4°C (40°F) | 5 mm |
| 2000 | 7°C (45°F) | 3°C (38°F) | 25 mm |
| 1999 | 16°C (60°F) | 4°C (39°F) | 0 mm |
| 1998 | 18°C (64°F) | 2°C (35°F) | 0 mm |
| 1997 | 14°C (58°F) | 3°C (37°F) | 0 mm |
| 1996 | 18°C (64°F) | 10°C (50°F) | 0 mm |
| 1995 | 13°C (55°F) | 4°C (40°F) | 16 mm |
| 1994 | 8°C (46°F) | -2°C (28°F) | 0 mm |
| 1993 | 3°C (38°F) | 1°C (33°F) | 10 mm |
| 1992 | 22°C (71°F) | 12°C (53°F) | 29 mm |
| 1991 | 9°C (48°F) | 3°C (38°F) | 79 mm |
| 1990 | 14°C (57°F) | 6°C (43°F) | 0 mm |
| 1989 | 13°C (55°F) | -2°C (28°F) | 0 mm |
| 1988 | 9°C (49°F) | 2°C (35°F) | 0 mm |
| 1987 | 28°C (83°F) | 13°C (56°F) | 2 mm |
| 1986 | 15°C (59°F) | 11°C (51°F) | 2 mm |
| 1985 | 23°C (74°F) | 5°C (41°F) | 1 mm |
| 1984 | 8°C (46°F) | -1°C (30°F) | 0 mm |
| 1983 | 2°C (36°F) | -3°C (27°F) | 2 mm |
| 1982 | 4°C (40°F) | 1°C (34°F) | 0 mm |
| 1981 | 4°C (39°F) | -7°C (19°F) | 0 mm |
| 1980 | 13°C (55°F) | 3°C (37°F) | 0 mm |
| 1979 | 19°C (67°F) | 3°C (37°F) | 1 mm |
| 1978 | 10°C (50°F) | 2°C (36°F) | 0 mm |
| 1977 | 25°C (77°F) | 14°C (57°F) | 12 mm |
| 1976 | 21°C (69°F) | 7°C (44°F) | 43 mm |
| 1975 | 6°C (42°F) | -4°C (25°F) | 0 mm |
| 1974 | 23°C (73°F) | -1°C (31°F) | 5 mm |
| 1973 | 23°C (74°F) | 8°C (47°F) | 1 mm |
| 1972 | 9°C (49°F) | -1°C (30°F) | 0 mm |
| 1971 | 5°C (41°F) | 3°C (38°F) | 11 mm |