Weather on September 21 in Calgary
Historical weather data for September 21 in Calgary, Canada
Based on 55 years of data from CALGARY GLENMORE DAM
About This Date
September 21st in Calgary, Canada typically brings mild fall weather, with average highs around 17°C and lows near 3°C — a 25°F daily swing. Over 55 years of records, the warmest September 21st was in 1987 (19°C average), while the coldest was 2000 (-1°C) — a 36°F range across recorded history. Precipitation has occurred on 36% of recorded September 21st dates, with snow falling 2% of the time (heaviest snowfall: 2.6"). The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Calgary? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2026 | 27°C (80°F) | 7°C (45°F) | -- |
| 2025 | 26°C (79°F) | 11°C (52°F) | -- |
| 2023 | 16°C (60°F) | 3°C (37°F) | 0 mm |
| 2022 | 17°C (62°F) | -1°C (31°F) | 0 mm |
| 2021 | 23°C (73°F) | 3°C (38°F) | 0 mm |
| 2020 | 22°C (71°F) | 3°C (37°F) | 0 mm |
| 2019 | 20°C (68°F) | 4°C (40°F) | 0 mm |
| 2018 | 6°C (42°F) | -1°C (31°F) | 2 mm |
| 2017 | 4°C (39°F) | 2°C (35°F) | 5 mm |
| 2016 | 13°C (55°F) | 3°C (37°F) | 0 mm |
| 2015 | 11°C (52°F) | -1°C (31°F) | 2 mm |
| 2014 | 26°C (78°F) | 6°C (42°F) | 0 mm |
| 2013 | 24°C (75°F) | 6°C (42°F) | 0 mm |
| 2012 | 26°C (78°F) | 6°C (42°F) | 0 mm |
| 2011 | 26°C (78°F) | 3°C (37°F) | 0 mm |
| 2010 | 6°C (42°F) | 1°C (33°F) | 2 mm |
| 2009 | 22°C (71°F) | 2°C (35°F) | 0 mm |
| 2008 | 14°C (58°F) | 8°C (46°F) | 4 mm |
| 2007 | 16°C (61°F) | -1°C (31°F) | 0 mm |
| 2006 | 9°C (49°F) | 2°C (36°F) | 3 mm |
| 2005 | 14°C (58°F) | -1°C (31°F) | 4 mm |
| 2004 | 21°C (70°F) | -1°C (30°F) | 0 mm |
| 2003 | 14°C (58°F) | 4°C (40°F) | 3 mm |
| 2002 | 14°C (57°F) | 1°C (33°F) | 0 mm |
| 2001 | 21°C (69°F) | 6°C (42°F) | 0 mm |
| 2000 | 1°C (33°F) | -3°C (26°F) | 1 mm |
| 1999 | 28°C (82°F) | -- | -- |
| 1998 | 19°C (67°F) | 3°C (37°F) | 0 mm |
| 1997 | 24°C (76°F) | 4°C (40°F) | 0 mm |
| 1996 | 13°C (55°F) | -2°C (28°F) | 1 mm |
| 1995 | 17°C (62°F) | -3°C (27°F) | 0 mm |
| 1994 | 19°C (66°F) | -2°C (28°F) | 0 mm |
| 1993 | 12°C (53°F) | -1°C (31°F) | 0 mm |
| 1992 | 16°C (61°F) | -1°C (31°F) | 0 mm |
| 1991 | 12°C (53°F) | 2°C (35°F) | 1 mm |
| 1990 | 19°C (66°F) | 6°C (42°F) | 0 mm |
| 1989 | 19°C (67°F) | 6°C (43°F) | 0 mm |
| 1988 | 16°C (61°F) | 1°C (33°F) | 0 mm |
| 1987 | 28°C (82°F) | 10°C (50°F) | 0 mm |
| 1986 | 16°C (60°F) | -1°C (31°F) | 1 mm |
| 1985 | 9°C (49°F) | 5°C (41°F) | 0 mm |
| 1984 | 3°C (38°F) | 1°C (33°F) | 11 mm |
| 1983 | 14°C (58°F) | 2°C (35°F) | 1 mm |
| 1982 | 18°C (65°F) | 3°C (38°F) | 0 mm |
| 1981 | 16°C (60°F) | 2°C (35°F) | 0 mm |
| 1980 | 12°C (53°F) | -2°C (28°F) | 0 mm |
| 1979 | 14°C (58°F) | 7°C (45°F) | 6 mm |
| 1978 | 14°C (58°F) | 7°C (45°F) | 0 mm |
| 1977 | 11°C (51°F) | 6°C (43°F) | 23 mm |
| 1976 | 26°C (79°F) | 6°C (43°F) | 0 mm |
| 1975 | 24°C (75°F) | 4°C (40°F) | 0 mm |
| 1974 | 22°C (72°F) | 3°C (38°F) | 0 mm |
| 1973 | 14°C (57°F) | 6°C (43°F) | 0 mm |
| 1972 | 18°C (64°F) | 0°C (32°F) | 0 mm |
| 1971 | 15°C (59°F) | 2°C (36°F) | 0 mm |