Weather on September 21 in Calgary
Historical weather data for September 21 in Calgary, Canada
Based on 54 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 54 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 35% of recorded September 21st dates, with snow falling 4% of the time (heaviest snowfall: 2.6"). Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
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 |
|---|---|---|---|
| 2025 | 26°C (79°F) | 11°C (52°F) | -- |
| 2023 | 16°C (60°F) | 3°C (37°F) | 0" |
| 2022 | 17°C (62°F) | -1°C (31°F) | 0" |
| 2021 | 23°C (73°F) | 6°C (42°F) | 0" |
| 2020 | 21°C (70°F) | 4°C (40°F) | 0" |
| 2019 | 19°C (67°F) | 2°C (36°F) | 0" |
| 2018 | 6°C (42°F) | 0°C (32°F) | 0.42" |
| 2017 | 4°C (39°F) | 2°C (35°F) | 0.46" |
| 2016 | 13°C (55°F) | 3°C (37°F) | 0" |
| 2015 | 11°C (52°F) | -1°C (31°F) | 0.18" |
| 2014 | 26°C (78°F) | 6°C (42°F) | 0" |
| 2013 | 24°C (75°F) | 6°C (42°F) | 0" |
| 2012 | 26°C (78°F) | 5°C (41°F) | 0" |
| 2011 | 26°C (78°F) | 3°C (37°F) | 0" |
| 2010 | 6°C (42°F) | 1°C (33°F) | 0.15" |
| 2009 | 22°C (71°F) | 1°C (34°F) | 0" |
| 2008 | 14°C (58°F) | 8°C (46°F) | 0.44" |
| 2007 | 16°C (61°F) | -1°C (31°F) | 0.02" |
| 2006 | 9°C (48°F) | 2°C (35°F) | 0.4" |
| 2005 | 13°C (56°F) | -1°C (31°F) | 0" |
| 2004 | 21°C (70°F) | -1°C (30°F) | 0" |
| 2003 | 14°C (58°F) | 4°C (40°F) | 0.34" |
| 2002 | 14°C (57°F) | 1°C (33°F) | 0" |
| 2001 | 22°C (71°F) | 6°C (42°F) | 0" |
| 2000 | 1°C (33°F) | -3°C (26°F) | 0.04" |
| 1999 | 27°C (80°F) | 7°C (45°F) | 0" |
| 1998 | 19°C (67°F) | 3°C (37°F) | 0" |
| 1997 | 24°C (76°F) | 4°C (40°F) | 0" |
| 1996 | 13°C (55°F) | -2°C (28°F) | 0.04" |
| 1995 | 17°C (62°F) | -3°C (27°F) | 0" |
| 1994 | 19°C (66°F) | -2°C (28°F) | 0" |
| 1993 | 12°C (53°F) | -1°C (31°F) | 0" |
| 1992 | 16°C (61°F) | -1°C (31°F) | 0" |
| 1991 | 12°C (53°F) | 2°C (35°F) | 0.06" |
| 1990 | 19°C (66°F) | 6°C (42°F) | 0" |
| 1989 | 19°C (67°F) | 6°C (43°F) | 0" |
| 1988 | 16°C (61°F) | 1°C (33°F) | 0.02" |
| 1987 | 28°C (82°F) | 10°C (50°F) | 0" |
| 1986 | 16°C (60°F) | -1°C (31°F) | 0.04" |
| 1985 | 9°C (49°F) | 5°C (41°F) | 0" |
| 1984 | 3°C (38°F) | 1°C (33°F) | 1.07" |
| 1983 | 14°C (58°F) | 2°C (35°F) | 0.04" |
| 1982 | 18°C (65°F) | 3°C (38°F) | 0" |
| 1981 | 16°C (60°F) | 2°C (35°F) | 0.02" |
| 1980 | 12°C (53°F) | -2°C (28°F) | 0.02" |
| 1979 | 14°C (58°F) | 7°C (45°F) | 0.59" |
| 1978 | 14°C (58°F) | 7°C (45°F) | 0" |
| 1977 | 11°C (51°F) | 6°C (43°F) | 2.29" |
| 1976 | 26°C (79°F) | 6°C (43°F) | 0" |
| 1975 | 24°C (75°F) | 4°C (40°F) | 0" |
| 1974 | 22°C (72°F) | 3°C (38°F) | 0" |
| 1973 | 14°C (57°F) | 6°C (43°F) | 0" |
| 1972 | 18°C (64°F) | 0°C (32°F) | 0" |
| 1971 | 15°C (59°F) | 2°C (36°F) | 0" |