Weather on December 21 in Sydney
Historical weather data for December 21 in Sydney, Australia
Based on 55 years of data from SYDNEY (OBSERVATORY HILL)
About This Date
December 21st in Sydney, Australia typically brings pleasant winter weather, with average highs around 26°C and lows near 19°C. Over 55 years of records, the warmest December 21st was in 1994 (31°C average), while the coldest was 2022 (17°C) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 27% of December 21st dates historically, with the wettest December 21st recording 2.84" of rain. The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
Planning for December 21st in Sydney? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip |
|---|---|---|---|
| 2025 | 31°C (87°F) | 23°C (73°F) | -- |
| 2024 | 23°C (74°F) | 18°C (65°F) | -- |
| 2023 | 22°C (71°F) | 17°C (63°F) | -- |
| 2022 | 19°C (67°F) | 15°C (59°F) | -- |
| 2021 | 26°C (79°F) | 22°C (72°F) | -- |
| 2020 | 23°C (73°F) | 19°C (66°F) | -- |
| 2019 | 29°C (84°F) | 21°C (70°F) | 0" |
| 2018 | 24°C (75°F) | 21°C (69°F) | 2.84" |
| 2017 | 24°C (76°F) | 21°C (70°F) | 0.3" |
| 2016 | 27°C (80°F) | 18°C (65°F) | 0" |
| 2015 | 29°C (84°F) | 23°C (74°F) | 0" |
| 2014 | 26°C (78°F) | 17°C (62°F) | 0" |
| 2013 | 28°C (82°F) | 22°C (71°F) | 0" |
| 2012 | 24°C (76°F) | 19°C (67°F) | 0" |
| 2011 | 25°C (77°F) | 19°C (66°F) | 0" |
| 2010 | 28°C (82°F) | 16°C (60°F) | 0" |
| 2009 | 25°C (77°F) | 20°C (68°F) | 0" |
| 2008 | 22°C (72°F) | 14°C (58°F) | 0.04" |
| 2007 | 28°C (82°F) | 21°C (70°F) | 0.04" |
| 2006 | 24°C (76°F) | 19°C (66°F) | 0.36" |
| 2005 | 32°C (89°F) | 17°C (63°F) | 0" |
| 2004 | 24°C (75°F) | 18°C (65°F) | 0" |
| 2003 | 26°C (79°F) | 19°C (67°F) | 0.06" |
| 2002 | 27°C (81°F) | 21°C (70°F) | 0" |
| 2001 | 27°C (81°F) | 23°C (73°F) | 0" |
| 2000 | 29°C (85°F) | 21°C (70°F) | 0" |
| 1999 | 22°C (72°F) | 13°C (56°F) | 0.12" |
| 1998 | 24°C (75°F) | 19°C (67°F) | 0.38" |
| 1997 | 33°C (91°F) | 20°C (68°F) | 0" |
| 1996 | 23°C (74°F) | 16°C (60°F) | 0" |
| 1995 | 22°C (71°F) | 16°C (60°F) | 0.06" |
| 1994 | 41°C (106°F) | 22°C (71°F) | 0" |
| 1993 | 22°C (72°F) | 19°C (67°F) | 0" |
| 1992 | 25°C (77°F) | 20°C (68°F) | 0" |
| 1991 | 23°C (74°F) | 20°C (68°F) | 0" |
| 1990 | 26°C (78°F) | 19°C (67°F) | 0.02" |
| 1989 | 20°C (68°F) | 18°C (64°F) | 0.02" |
| 1988 | 23°C (73°F) | 21°C (69°F) | 0" |
| 1987 | 19°C (66°F) | 17°C (62°F) | 2.82" |
| 1986 | 24°C (76°F) | 17°C (62°F) | 0" |
| 1985 | 37°C (98°F) | 20°C (68°F) | 0" |
| 1984 | 24°C (75°F) | 16°C (61°F) | 0" |
| 1983 | 35°C (95°F) | 19°C (66°F) | 0" |
| 1982 | 23°C (73°F) | 17°C (62°F) | 0.02" |
| 1981 | 23°C (74°F) | 18°C (65°F) | 0" |
| 1980 | 33°C (91°F) | 19°C (66°F) | 0" |
| 1979 | 31°C (87°F) | 19°C (66°F) | 0" |
| 1978 | 23°C (74°F) | 17°C (62°F) | 0" |
| 1977 | 25°C (77°F) | 19°C (67°F) | 0" |
| 1976 | 29°C (85°F) | 17°C (63°F) | 0" |
| 1975 | 23°C (74°F) | 16°C (60°F) | 0.1" |
| 1974 | 22°C (71°F) | 16°C (60°F) | 0" |
| 1973 | 28°C (82°F) | 21°C (69°F) | 0" |
| 1972 | 36°C (97°F) | 21°C (70°F) | 0" |
| 1971 | 24°C (76°F) | 19°C (67°F) | 0.03" |