Weather on August 21 in Montreal
Historical weather data for August 21 in Montreal, Canada
Based on 50 years of data from MCTAVISH
About This Date
August 21st in Montreal, Canada typically brings pleasant summer weather, with average highs around 25°C and lows near 16°C. Over 50 years of records, the warmest August 21st was in 2021 (29°C average), while the coldest was 1982 (12°C) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 38% of August 21st dates historically, with the wettest August 21st recording 3.99" of rain. The last decade has been 5.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.2°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Montreal? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 26°C (78°F) | 16°C (60°F) | -- |
| 2023 | 22°C (71°F) | 16°C (60°F) | 0 mm |
| 2022 | 31°C (87°F) | 21°C (69°F) | 28 mm |
| 2021 | 35°C (95°F) | 23°C (73°F) | 0 mm |
| 2020 | 24°C (75°F) | 17°C (63°F) | 22 mm |
| 2019 | 24°C (76°F) | 19°C (67°F) | 9 mm |
| 2018 | 27°C (80°F) | 19°C (66°F) | 0 mm |
| 2017 | 28°C (82°F) | 19°C (67°F) | 0 mm |
| 2016 | 28°C (82°F) | 19°C (66°F) | 56 mm |
| 2015 | 26°C (78°F) | 18°C (64°F) | 15 mm |
| 2014 | 23°C (74°F) | 18°C (65°F) | 0 mm |
| 2013 | 29°C (85°F) | 21°C (69°F) | 0 mm |
| 2012 | 23°C (74°F) | 15°C (59°F) | 0 mm |
| 2011 | 23°C (73°F) | 17°C (62°F) | 101 mm |
| 2010 | 20°C (68°F) | 14°C (58°F) | 0 mm |
| 2009 | 28°C (83°F) | 20°C (68°F) | 35 mm |
| 2008 | 26°C (78°F) | 15°C (59°F) | 0 mm |
| 2007 | 23°C (73°F) | 11°C (51°F) | 0 mm |
| 2006 | 25°C (77°F) | 14°C (58°F) | 7 mm |
| 2005 | 27°C (81°F) | 17°C (62°F) | 18 mm |
| 2004 | 21°C (69°F) | 13°C (55°F) | 0 mm |
| 2003 | 29°C (85°F) | 20°C (68°F) | 0 mm |
| 2002 | 27°C (80°F) | 16°C (60°F) | 0 mm |
| 2001 | 26°C (78°F) | 18°C (64°F) | 0 mm |
| 2000 | 24°C (75°F) | 13°C (55°F) | 0 mm |
| 1999 | 23°C (73°F) | 16°C (61°F) | 0 mm |
| 1998 | 25°C (77°F) | 15°C (59°F) | 3 mm |
| 1997 | 19°C (66°F) | 13°C (55°F) | 51 mm |
| 1992 | 24°C (75°F) | 13°C (55°F) | 0 mm |
| 1991 | 18°C (64°F) | 16°C (61°F) | 11 mm |
| 1990 | 23°C (74°F) | 14°C (58°F) | 0 mm |
| 1989 | 26°C (79°F) | 18°C (64°F) | 0 mm |
| 1988 | 18°C (64°F) | 13°C (55°F) | 2 mm |
| 1987 | 25°C (77°F) | 16°C (61°F) | 0 mm |
| 1986 | 25°C (77°F) | 13°C (56°F) | 3 mm |
| 1985 | 23°C (73°F) | 15°C (59°F) | 0 mm |
| 1984 | 24°C (75°F) | 13°C (56°F) | 0 mm |
| 1983 | 25°C (77°F) | 14°C (58°F) | 4 mm |
| 1982 | 16°C (60°F) | 8°C (46°F) | 0 mm |
| 1981 | 28°C (83°F) | 18°C (64°F) | 0 mm |
| 1980 | 25°C (77°F) | 16°C (60°F) | 0 mm |
| 1979 | 25°C (77°F) | 16°C (60°F) | 46 mm |
| 1978 | 23°C (74°F) | 13°C (55°F) | 0 mm |
| 1977 | 22°C (71°F) | 12°C (53°F) | 31 mm |
| 1976 | 30°C (86°F) | 20°C (68°F) | 0 mm |
| 1975 | 23°C (73°F) | 14°C (57°F) | 12 mm |
| 1974 | 30°C (86°F) | 17°C (62°F) | 0 mm |
| 1973 | 28°C (83°F) | 19°C (67°F) | 18 mm |
| 1972 | 27°C (80°F) | 15°C (59°F) | 0 mm |
| 1971 | 22°C (72°F) | 17°C (63°F) | 0 mm |