Weather on September 15 in Montreal
Historical weather data for September 15 in Montreal, Canada
Based on 51 years of data from MONTREAL MCGILL
About This Date
September 15th in Montreal, Canada typically brings mild fall weather, with average highs around 20°C and lows near 12°C. Over 51 years of records, the warmest September 15th was in 2018 (24°C average), while the coldest was 1984 (11°C) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 37% of September 15th dates historically, with the wettest September 15th recording 1.32" of rain. The last decade has been 2.9°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.9°F cooler on this date compared to 20-30 years ago.
Planning for September 15th in Montreal? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 22°C (71°F) | 13°C (55°F) | -- |
| 2023 | 22°C (72°F) | 11°C (51°F) | 0 mm |
| 2022 | 17°C (63°F) | 9°C (48°F) | 0 mm |
| 2021 | 22°C (71°F) | 15°C (59°F) | 24 mm |
| 2020 | 14°C (58°F) | 8°C (46°F) | 0 mm |
| 2019 | 17°C (63°F) | 12°C (54°F) | 0 mm |
| 2018 | 29°C (85°F) | 18°C (65°F) | 0 mm |
| 2016 | 18°C (65°F) | 9°C (49°F) | 0 mm |
| 2015 | 26°C (78°F) | 15°C (59°F) | 0 mm |
| 2014 | 18°C (65°F) | 7°C (44°F) | 0 mm |
| 2013 | 19°C (66°F) | 11°C (51°F) | 7 mm |
| 2012 | 18°C (64°F) | 9°C (48°F) | 3 mm |
| 2011 | 16°C (60°F) | 7°C (45°F) | 20 mm |
| 2010 | 15°C (59°F) | 9°C (48°F) | 0 mm |
| 2009 | 18°C (64°F) | 12°C (53°F) | 0 mm |
| 2008 | 25°C (77°F) | 10°C (50°F) | 27 mm |
| 2007 | 14°C (57°F) | 8°C (46°F) | 20 mm |
| 2006 | 21°C (69°F) | 15°C (59°F) | 0 mm |
| 2005 | 23°C (74°F) | 17°C (63°F) | 0 mm |
| 2004 | 24°C (76°F) | 16°C (60°F) | 0 mm |
| 2003 | 26°C (78°F) | 21°C (70°F) | 6 mm |
| 2002 | 22°C (71°F) | -- | -- |
| 2001 | 18°C (65°F) | 8°C (47°F) | 0 mm |
| 2000 | 17°C (62°F) | 11°C (52°F) | 22 mm |
| 1999 | 22°C (71°F) | 15°C (59°F) | 0 mm |
| 1998 | 22°C (72°F) | 15°C (59°F) | 7 mm |
| 1997 | 22°C (71°F) | 15°C (59°F) | 0 mm |
| 1996 | 14°C (58°F) | 11°C (52°F) | 3 mm |
| 1994 | 22°C (71°F) | 9°C (49°F) | 0 mm |
| 1992 | 25°C (77°F) | 15°C (59°F) | 0 mm |
| 1991 | 21°C (69°F) | 14°C (57°F) | 34 mm |
| 1990 | 19°C (66°F) | 11°C (52°F) | 0 mm |
| 1989 | 20°C (68°F) | 12°C (54°F) | 0 mm |
| 1988 | 15°C (59°F) | 7°C (45°F) | 1 mm |
| 1987 | 21°C (70°F) | 13°C (56°F) | 0 mm |
| 1986 | 14°C (58°F) | 8°C (46°F) | 5 mm |
| 1985 | 21°C (69°F) | 11°C (51°F) | 0 mm |
| 1984 | 13°C (55°F) | 9°C (49°F) | 1 mm |
| 1983 | 19°C (66°F) | 9°C (48°F) | 0 mm |
| 1982 | 15°C (59°F) | 12°C (53°F) | 2 mm |
| 1981 | 21°C (69°F) | 13°C (55°F) | 0 mm |
| 1980 | 19°C (66°F) | 11°C (52°F) | 0 mm |
| 1979 | 17°C (62°F) | 11°C (51°F) | 0 mm |
| 1978 | 21°C (70°F) | 13°C (55°F) | 3 mm |
| 1977 | 17°C (63°F) | 7°C (44°F) | 0 mm |
| 1976 | 26°C (78°F) | 20°C (68°F) | 0 mm |
| 1975 | 19°C (66°F) | 8°C (46°F) | 1 mm |
| 1974 | 20°C (68°F) | 12°C (53°F) | 1 mm |
| 1973 | 20°C (68°F) | 11°C (52°F) | 0 mm |
| 1972 | 21°C (69°F) | 10°C (50°F) | 0 mm |
| 1971 | 26°C (79°F) | 18°C (65°F) | 1 mm |