Weather on August 21 in Calgary
Historical weather data for August 21 in Calgary, Canada
Based on 55 years of data from CALGARY GLENMORE DAM
About This Date
August 21st in Calgary, Canada typically brings pleasant summer weather, with average highs around 23°C and lows near 8°C — a 26°F daily swing. Over 55 years of records, the warmest August 21st was in 1971 (23°C average), while the coldest was 1992 (6°C) — a 31°F range across recorded history. Precipitation has occurred on 25% of recorded August 21st dates, with snow falling 2% of the time. 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 August 21st in Calgary? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2026 | 26°C (78°F) | 11°C (51°F) | -- |
| 2025 | 20°C (68°F) | 6°C (43°F) | -- |
| 2023 | 18°C (65°F) | 7°C (45°F) | 1 mm |
| 2022 | 26°C (79°F) | 14°C (58°F) | 3 mm |
| 2021 | 19°C (66°F) | 7°C (44°F) | 0 mm |
| 2020 | 28°C (82°F) | 11°C (51°F) | 0 mm |
| 2019 | 31°C (88°F) | 11°C (52°F) | 1 mm |
| 2018 | 26°C (79°F) | 6°C (42°F) | 0 mm |
| 2017 | 23°C (73°F) | 4°C (39°F) | 0 mm |
| 2016 | 27°C (81°F) | 12°C (54°F) | 0 mm |
| 2015 | 12°C (53°F) | 3°C (37°F) | 37 mm |
| 2014 | 13°C (55°F) | 9°C (48°F) | 0 mm |
| 2013 | 23°C (73°F) | 5°C (41°F) | 0 mm |
| 2012 | 27°C (80°F) | 13°C (56°F) | 0 mm |
| 2011 | 29°C (85°F) | 9°C (49°F) | 0 mm |
| 2010 | 19°C (66°F) | 8°C (46°F) | 0 mm |
| 2009 | 31°C (88°F) | 11°C (52°F) | 0 mm |
| 2008 | 18°C (65°F) | 8°C (46°F) | 13 mm |
| 2007 | 21°C (70°F) | 6°C (42°F) | 0 mm |
| 2006 | 31°C (88°F) | 8°C (46°F) | 0 mm |
| 2005 | 31°C (87°F) | 7°C (45°F) | 0 mm |
| 2004 | 22°C (72°F) | 9°C (49°F) | 2 mm |
| 2003 | 31°C (88°F) | 9°C (48°F) | 0 mm |
| 2002 | 24°C (75°F) | 7°C (44°F) | 0 mm |
| 2001 | 23°C (74°F) | 6°C (43°F) | 0 mm |
| 2000 | 22°C (72°F) | 6°C (42°F) | 0 mm |
| 1999 | 28°C (82°F) | -- | -- |
| 1998 | 24°C (76°F) | 10°C (50°F) | 2 mm |
| 1997 | 27°C (80°F) | 12°C (53°F) | 0 mm |
| 1996 | 21°C (69°F) | 6°C (42°F) | 0 mm |
| 1995 | 27°C (81°F) | 4°C (39°F) | 0 mm |
| 1994 | 28°C (83°F) | 9°C (49°F) | 0 mm |
| 1993 | 23°C (73°F) | 12°C (53°F) | 0 mm |
| 1992 | 11°C (51°F) | 1°C (33°F) | 1 mm |
| 1991 | 26°C (79°F) | 10°C (50°F) | 0 mm |
| 1990 | 26°C (78°F) | 12°C (54°F) | 0 mm |
| 1989 | 23°C (73°F) | 11°C (51°F) | 0 mm |
| 1988 | 20°C (68°F) | 10°C (50°F) | 3 mm |
| 1987 | 16°C (61°F) | 6°C (42°F) | 0 mm |
| 1986 | 19°C (67°F) | 8°C (47°F) | 0 mm |
| 1985 | 10°C (50°F) | 7°C (45°F) | 22 mm |
| 1984 | 23°C (73°F) | 8°C (46°F) | 0 mm |
| 1983 | 23°C (73°F) | 13°C (55°F) | 0 mm |
| 1982 | 23°C (73°F) | -- | 0 mm |
| 1981 | 23°C (74°F) | 9°C (49°F) | 3 mm |
| 1980 | 17°C (62°F) | 3°C (38°F) | 0 mm |
| 1979 | 24°C (75°F) | 11°C (51°F) | 0 mm |
| 1978 | 19°C (66°F) | 2°C (35°F) | 0 mm |
| 1977 | 14°C (58°F) | 1°C (34°F) | 8 mm |
| 1976 | 22°C (71°F) | 6°C (43°F) | 0 mm |
| 1975 | 22°C (72°F) | 12°C (53°F) | 0 mm |
| 1974 | 20°C (68°F) | 7°C (44°F) | 0 mm |
| 1973 | 25°C (77°F) | 5°C (41°F) | 0 mm |
| 1972 | 22°C (72°F) | 8°C (47°F) | 0 mm |
| 1971 | 30°C (86°F) | 15°C (59°F) | 0 mm |