Weather on August 21 in Sydney
Historical weather data for August 21 in Sydney, Australia
Based on 55 years of data from SYDNEY (OBSERVATORY HILL)
About This Date
August 21st in Sydney, Australia typically brings mild summer weather, with average highs around 19°C and lows near 10°C. Over 55 years of records, the warmest August 21st was in 1995 (21°C average), while the coldest was 1985 (12°C) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 25% of August 21st dates historically, with the wettest August 21st recording 2.4" of rain. The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Sydney? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 18°C (64°F) | 11°C (51°F) | -- |
| 2024 | 26°C (78°F) | 16°C (60°F) | -- |
| 2023 | 19°C (67°F) | 13°C (56°F) | -- |
| 2022 | 17°C (62°F) | 12°C (54°F) | -- |
| 2021 | 21°C (70°F) | 13°C (55°F) | -- |
| 2020 | 19°C (66°F) | 9°C (49°F) | 0 mm |
| 2019 | 22°C (72°F) | 9°C (49°F) | 0 mm |
| 2018 | 18°C (64°F) | 8°C (47°F) | 0 mm |
| 2017 | 18°C (64°F) | 8°C (47°F) | 0 mm |
| 2016 | 21°C (69°F) | 8°C (47°F) | 0 mm |
| 2015 | 21°C (70°F) | 9°C (49°F) | 0 mm |
| 2014 | 18°C (65°F) | 9°C (49°F) | 27 mm |
| 2013 | 18°C (65°F) | 8°C (46°F) | 0 mm |
| 2012 | 22°C (72°F) | 9°C (48°F) | 0 mm |
| 2011 | 18°C (65°F) | 12°C (54°F) | 6 mm |
| 2010 | 17°C (62°F) | 9°C (48°F) | 0 mm |
| 2009 | 25°C (77°F) | 11°C (52°F) | 0 mm |
| 2008 | 20°C (68°F) | 9°C (49°F) | 0 mm |
| 2007 | 19°C (66°F) | 11°C (52°F) | 12 mm |
| 2006 | 21°C (70°F) | 9°C (48°F) | 0 mm |
| 2005 | 22°C (71°F) | 11°C (51°F) | 0 mm |
| 2004 | 23°C (74°F) | 9°C (49°F) | 0 mm |
| 2003 | 16°C (60°F) | 8°C (46°F) | 3 mm |
| 2002 | 21°C (69°F) | 9°C (49°F) | 0 mm |
| 2001 | 17°C (63°F) | 10°C (50°F) | 0 mm |
| 2000 | 21°C (69°F) | 8°C (47°F) | 0 mm |
| 1999 | 17°C (62°F) | 12°C (53°F) | 21 mm |
| 1998 | 21°C (70°F) | 12°C (53°F) | 7 mm |
| 1997 | 18°C (64°F) | 11°C (51°F) | 16 mm |
| 1996 | 17°C (63°F) | 6°C (43°F) | 0 mm |
| 1995 | 27°C (81°F) | 14°C (58°F) | 0 mm |
| 1994 | 19°C (66°F) | 9°C (49°F) | 32 mm |
| 1993 | 22°C (71°F) | 11°C (51°F) | 0 mm |
| 1992 | 18°C (64°F) | 7°C (44°F) | 0 mm |
| 1991 | 17°C (63°F) | 11°C (51°F) | 0 mm |
| 1990 | 19°C (67°F) | 9°C (49°F) | 2 mm |
| 1989 | 17°C (63°F) | 8°C (46°F) | 61 mm |
| 1988 | 23°C (73°F) | 11°C (51°F) | 0 mm |
| 1987 | 18°C (64°F) | 9°C (48°F) | 0 mm |
| 1986 | 18°C (65°F) | 8°C (46°F) | 0 mm |
| 1985 | 16°C (61°F) | 7°C (45°F) | 0 mm |
| 1984 | 18°C (65°F) | 13°C (55°F) | 1 mm |
| 1983 | 18°C (64°F) | 7°C (45°F) | 0 mm |
| 1982 | 22°C (71°F) | 9°C (48°F) | 0 mm |
| 1981 | 17°C (63°F) | 13°C (56°F) | 2 mm |
| 1980 | 23°C (73°F) | 13°C (56°F) | 4 mm |
| 1979 | 17°C (62°F) | 12°C (53°F) | 0 mm |
| 1978 | 18°C (64°F) | 10°C (50°F) | 0 mm |
| 1977 | 24°C (76°F) | 13°C (55°F) | 0 mm |
| 1976 | 23°C (73°F) | 8°C (47°F) | 0 mm |
| 1975 | 19°C (67°F) | 11°C (51°F) | 0 mm |
| 1974 | 19°C (67°F) | 8°C (46°F) | 0 mm |
| 1973 | 17°C (62°F) | 8°C (47°F) | 0 mm |
| 1972 | 18°C (64°F) | 8°C (47°F) | 0 mm |
| 1971 | 17°C (62°F) | 12°C (53°F) | 6 mm |