Weather on September 21 in Sydney
Historical weather data for September 21 in Sydney, Australia
Based on 55 years of data from SYDNEY (OBSERVATORY HILL)
About This Date
September 21st in Sydney, Australia typically brings pleasant fall weather, with average highs around 21°C and lows near 12°C. Over 55 years of records, the warmest September 21st was in 1990 (21°C average), while the coldest was 1985 (13°C) — a 15°F range across recorded history. Rain or other precipitation has occurred on about 27% of September 21st dates historically, with the wettest September 21st recording 2.04" of rain. 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 Sydney? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip |
|---|---|---|---|
| 2025 | 21°C (70°F) | 12°C (53°F) | -- |
| 2024 | 24°C (75°F) | 13°C (56°F) | -- |
| 2023 | 20°C (68°F) | 17°C (63°F) | -- |
| 2022 | 18°C (65°F) | 15°C (59°F) | -- |
| 2021 | 15°C (59°F) | 11°C (51°F) | -- |
| 2020 | 26°C (78°F) | 16°C (60°F) | -- |
| 2019 | 23°C (73°F) | 18°C (64°F) | 0" |
| 2018 | 19°C (67°F) | 8°C (47°F) | 0" |
| 2017 | 21°C (70°F) | 11°C (51°F) | 0" |
| 2016 | 21°C (70°F) | 14°C (57°F) | 0" |
| 2015 | 23°C (73°F) | 12°C (54°F) | 0.02" |
| 2014 | 21°C (70°F) | 11°C (52°F) | 0.1" |
| 2013 | 22°C (72°F) | 11°C (52°F) | 0" |
| 2012 | 22°C (72°F) | 14°C (57°F) | 0" |
| 2011 | 23°C (73°F) | 12°C (53°F) | 0" |
| 2010 | 24°C (75°F) | 12°C (53°F) | 0" |
| 2009 | 26°C (78°F) | 16°C (60°F) | 0" |
| 2008 | 22°C (71°F) | 16°C (60°F) | 0" |
| 2007 | 19°C (67°F) | 12°C (53°F) | 0.44" |
| 2006 | 27°C (80°F) | 14°C (57°F) | 0" |
| 2005 | 22°C (71°F) | 12°C (53°F) | 0.16" |
| 2004 | 24°C (75°F) | 11°C (51°F) | 0" |
| 2003 | 24°C (75°F) | 11°C (52°F) | 0" |
| 2002 | 27°C (81°F) | 10°C (50°F) | 0" |
| 2001 | 24°C (75°F) | 17°C (62°F) | 0" |
| 2000 | 24°C (76°F) | 14°C (57°F) | 0" |
| 1999 | 19°C (67°F) | 12°C (53°F) | 0.62" |
| 1998 | 20°C (68°F) | 16°C (61°F) | 0.02" |
| 1997 | 16°C (61°F) | 13°C (55°F) | 0.52" |
| 1996 | 16°C (61°F) | 9°C (49°F) | 1.04" |
| 1995 | 24°C (75°F) | 13°C (55°F) | 0.78" |
| 1994 | 15°C (59°F) | 10°C (50°F) | 0" |
| 1993 | 20°C (68°F) | 11°C (51°F) | 0" |
| 1992 | 19°C (66°F) | 8°C (47°F) | 0" |
| 1991 | 23°C (74°F) | 13°C (56°F) | 0" |
| 1990 | 27°C (80°F) | 16°C (60°F) | 0" |
| 1989 | 19°C (67°F) | 11°C (52°F) | 0" |
| 1988 | 21°C (69°F) | 11°C (51°F) | 0" |
| 1987 | 19°C (66°F) | 14°C (58°F) | 0" |
| 1986 | 21°C (70°F) | 9°C (49°F) | 0" |
| 1985 | 15°C (59°F) | 11°C (51°F) | 2.04" |
| 1984 | 22°C (72°F) | 12°C (54°F) | 0.04" |
| 1983 | 22°C (72°F) | 12°C (54°F) | 0" |
| 1982 | 17°C (63°F) | 11°C (52°F) | 1.6" |
| 1981 | 22°C (71°F) | 14°C (57°F) | 0" |
| 1980 | 25°C (77°F) | 11°C (51°F) | 0" |
| 1979 | 17°C (63°F) | 13°C (55°F) | 0" |
| 1978 | 17°C (62°F) | 11°C (51°F) | 0.04" |
| 1977 | 19°C (67°F) | 11°C (51°F) | 0" |
| 1976 | 23°C (73°F) | 13°C (56°F) | 0.56" |
| 1975 | 19°C (67°F) | 12°C (53°F) | 0" |
| 1974 | 21°C (70°F) | 10°C (50°F) | 0" |
| 1973 | 19°C (66°F) | 11°C (52°F) | 0" |
| 1972 | 23°C (74°F) | 14°C (57°F) | 0" |
| 1971 | 22°C (71°F) | 17°C (62°F) | 0.94" |