Weather on September 20 in Montreal
Historical weather data for September 20 in Montreal, Canada
Based on 52 years of data from MCTAVISH
About This Date
September 20th in Montreal, Canada typically brings mild fall weather, with average highs around 20°C and lows near 12°C. Over 52 years of records, the warmest September 20th was in 1983 (24°C average), while the coldest was 1977 (7°C) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 35% of September 20th dates historically, with the wettest September 20th recording 1.3" of rain. The last decade has been 3.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.4°F cooler on this date compared to 20-30 years ago.
Planning for September 20th in Montreal? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 17°C (63°F) | 8°C (46°F) | -- |
| 2023 | 20°C (68°F) | 12°C (54°F) | 0 mm |
| 2022 | 14°C (58°F) | 11°C (51°F) | 0 mm |
| 2021 | 25°C (77°F) | 12°C (53°F) | 0 mm |
| 2020 | 14°C (57°F) | 6°C (42°F) | 0 mm |
| 2019 | 24°C (76°F) | 13°C (56°F) | 0 mm |
| 2018 | 17°C (62°F) | 9°C (49°F) | 0 mm |
| 2017 | 26°C (79°F) | 18°C (64°F) | 0 mm |
| 2016 | 27°C (80°F) | 14°C (58°F) | 0 mm |
| 2015 | 18°C (65°F) | 12°C (53°F) | 0 mm |
| 2014 | 20°C (68°F) | 10°C (50°F) | 0 mm |
| 2013 | 26°C (78°F) | 14°C (58°F) | 0 mm |
| 2012 | 19°C (67°F) | 7°C (45°F) | 0 mm |
| 2011 | 21°C (70°F) | 12°C (54°F) | 11 mm |
| 2010 | 19°C (66°F) | 11°C (51°F) | 0 mm |
| 2009 | 20°C (68°F) | 9°C (49°F) | 0 mm |
| 2008 | 23°C (73°F) | 11°C (51°F) | 0 mm |
| 2007 | 24°C (76°F) | 16°C (60°F) | 0 mm |
| 2006 | 18°C (65°F) | 8°C (47°F) | 0 mm |
| 2005 | 26°C (78°F) | 16°C (60°F) | 1 mm |
| 2004 | 17°C (62°F) | 8°C (46°F) | 0 mm |
| 2003 | 22°C (72°F) | 16°C (61°F) | 1 mm |
| 2002 | 27°C (81°F) | 19°C (66°F) | 0 mm |
| 2001 | 20°C (68°F) | 17°C (63°F) | 12 mm |
| 2000 | 27°C (81°F) | 14°C (57°F) | 0 mm |
| 1999 | 23°C (73°F) | 14°C (58°F) | 23 mm |
| 1998 | 19°C (66°F) | 13°C (56°F) | 0 mm |
| 1997 | 18°C (65°F) | 7°C (44°F) | 18 mm |
| 1996 | 22°C (72°F) | 14°C (57°F) | 0 mm |
| 1994 | 23°C (74°F) | -- | 0 mm |
| 1992 | 18°C (64°F) | 10°C (50°F) | 0 mm |
| 1991 | 13°C (56°F) | 6°C (43°F) | 0 mm |
| 1990 | 15°C (59°F) | 10°C (50°F) | 1 mm |
| 1989 | 22°C (71°F) | 15°C (59°F) | 0 mm |
| 1988 | 24°C (76°F) | 16°C (61°F) | 3 mm |
| 1987 | 16°C (61°F) | 12°C (54°F) | 11 mm |
| 1986 | 13°C (55°F) | 9°C (48°F) | 0 mm |
| 1985 | 28°C (82°F) | 19°C (67°F) | 0 mm |
| 1984 | 21°C (70°F) | 14°C (58°F) | 6 mm |
| 1983 | 31°C (88°F) | 17°C (62°F) | 0 mm |
| 1982 | 19°C (67°F) | 7°C (45°F) | 0 mm |
| 1981 | 13°C (55°F) | 9°C (49°F) | 0 mm |
| 1980 | 22°C (72°F) | 11°C (51°F) | 3 mm |
| 1979 | 13°C (56°F) | 4°C (39°F) | 0 mm |
| 1978 | 21°C (69°F) | 9°C (48°F) | 1 mm |
| 1977 | 8°C (46°F) | 6°C (43°F) | 33 mm |
| 1976 | 12°C (53°F) | 10°C (50°F) | 17 mm |
| 1975 | 24°C (76°F) | 17°C (62°F) | 5 mm |
| 1974 | 19°C (66°F) | 16°C (61°F) | 0 mm |
| 1973 | 13°C (55°F) | 11°C (51°F) | 4 mm |
| 1972 | 18°C (64°F) | 7°C (45°F) | 0 mm |
| 1971 | 20°C (68°F) | 14°C (57°F) | 8 mm |