Weather on October 21 in Montreal
Historical weather data for October 21 in Montreal, Canada
Based on 52 years of data from MCTAVISH
About This Date
October 21st in Montreal, Canada typically brings cool fall weather, with average highs around 12°C and lows near 5°C. Over 52 years of records, the warmest October 21st was in 1979 (19°C average), while the coldest was 1974 (1°C) — a 32°F range across recorded history. Precipitation has occurred on 52% of recorded October 21st dates, with snow falling 2% of the time (heaviest snowfall: 1.1"). The last decade has been 6.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.9°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Montreal? 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) |
|---|---|---|---|
| 2025 | 15°C (59°F) | 9°C (48°F) | -- |
| 2023 | 14°C (58°F) | 8°C (47°F) | 53 mm |
| 2022 | 14°C (58°F) | 5°C (41°F) | 1 mm |
| 2021 | 14°C (58°F) | 9°C (49°F) | 12 mm |
| 2020 | 16°C (61°F) | 5°C (41°F) | 36 mm |
| 2019 | 16°C (60°F) | 4°C (40°F) | 0 mm |
| 2018 | 5°C (41°F) | 1°C (33°F) | 0 mm |
| 2017 | 21°C (70°F) | 12°C (53°F) | 0 mm |
| 2016 | 10°C (50°F) | 8°C (46°F) | 107 mm |
| 2015 | 9°C (49°F) | 3°C (37°F) | 0 mm |
| 2014 | 8°C (46°F) | 6°C (42°F) | 8 mm |
| 2013 | 14°C (58°F) | 4°C (40°F) | 0 mm |
| 2012 | 13°C (55°F) | 8°C (46°F) | 3 mm |
| 2011 | 13°C (55°F) | 8°C (47°F) | 6 mm |
| 2010 | 10°C (50°F) | 3°C (37°F) | 16 mm |
| 2009 | 9°C (49°F) | 3°C (38°F) | 5 mm |
| 2008 | 8°C (47°F) | 3°C (37°F) | 44 mm |
| 2007 | 23°C (74°F) | 12°C (53°F) | 0 mm |
| 2006 | 7°C (44°F) | 2°C (35°F) | 0 mm |
| 2005 | 9°C (49°F) | 2°C (35°F) | 0 mm |
| 2004 | 8°C (46°F) | 3°C (37°F) | 0 mm |
| 2003 | 3°C (38°F) | 2°C (35°F) | 93 mm |
| 2002 | 6°C (43°F) | 0°C (32°F) | 3 mm |
| 2001 | 16°C (60°F) | 9°C (49°F) | 27 mm |
| 2000 | 18°C (65°F) | 4°C (40°F) | 0 mm |
| 1999 | 11°C (52°F) | 4°C (40°F) | 3 mm |
| 1998 | 9°C (48°F) | 3°C (38°F) | 0 mm |
| 1997 | 8°C (46°F) | 1°C (34°F) | 0 mm |
| 1996 | 7°C (45°F) | 6°C (42°F) | 145 mm |
| 1994 | 17°C (63°F) | 12°C (53°F) | 0 mm |
| 1992 | 6°C (42°F) | 2°C (36°F) | 2 mm |
| 1991 | 10°C (50°F) | 3°C (37°F) | 0 mm |
| 1990 | 18°C (64°F) | 3°C (37°F) | 7 mm |
| 1989 | 7°C (45°F) | 4°C (40°F) | 10 mm |
| 1988 | 10°C (50°F) | 1°C (34°F) | 7 mm |
| 1987 | 6°C (43°F) | 5°C (41°F) | 2 mm |
| 1986 | 12°C (54°F) | 8°C (46°F) | 1 mm |
| 1985 | 11°C (51°F) | 3°C (38°F) | 0 mm |
| 1984 | 18°C (64°F) | 9°C (49°F) | 18 mm |
| 1983 | 8°C (46°F) | 1°C (33°F) | 0 mm |
| 1982 | 9°C (48°F) | 6°C (43°F) | 0 mm |
| 1981 | 7°C (45°F) | 7°C (44°F) | 21 mm |
| 1980 | 7°C (44°F) | 2°C (36°F) | 16 mm |
| 1979 | 23°C (73°F) | 15°C (59°F) | 0 mm |
| 1978 | 18°C (64°F) | 7°C (45°F) | 0 mm |
| 1977 | 16°C (60°F) | 5°C (41°F) | 9 mm |
| 1976 | 7°C (44°F) | 4°C (40°F) | 1 mm |
| 1975 | 16°C (60°F) | 9°C (49°F) | 0 mm |
| 1974 | 3°C (38°F) | -1°C (31°F) | 0 mm |
| 1973 | 10°C (50°F) | 3°C (37°F) | 0 mm |
| 1972 | 11°C (51°F) | 2°C (35°F) | 0 mm |
| 1971 | 19°C (66°F) | 11°C (52°F) | 0 mm |