Sydney Weather in December
In December, Sydney averages a high of 25°C (77°F) and a low of 18°C (65°F), from 55 years of daily records (1971–2026).
25°C
Average high
77°F
18°C
Average low
65°F
38°C
Record high
101°F · December 20, 2017
11°C
Record low
52°F · December 13, 1995
What December Is Like in Sydney
- The coldest December reading, 11°C (52°F) on December 13, 1995, has not been matched in 31 years.
- A typical December brings 2.3 days above 30°C (86°F).
- The warmest December in the record was 1990; the coldest was 2022.
At least 1 mm of rain falls on 24% of December days, and the month averages 71 mm in total.
Warmest: 2005 (28.2°C)Latest: 2025 (23.7°C)10-year averageLong-run average (25.1°C)
Look Up a Day in December
See the weather in Sydney on any December date, year by year.
Source: NOAA GHCN-Daily, Sydney (Observatory Hill) (1971–2020); Sydney Harbour (Wedding Cake W (2020–2026). Averages cover 1971–2026. How we compute this