December · Australia
Best time to visit Sydney in December Weather, crowds & prices
Weather in Sydney in December
Average temperature 21°C, 72 mm of rain, about 29 days with 6+ hours of sunshine and 73% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
December score
8.7/10
Ranked #3 of 12 months
- Avg temp
- 21°C
- Rainfall
- 72 mm
- Humidity
- 73%
- Days with 6h+ sun
- 29
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$$ · Peak Season Rates ($$$)
December in Sydney scores 8.7/10 for sightseeing and cultural travel - one of the top 12-month picks (#3). Expect around 21°C, 72 mm of rain, and roughly 29 days with 6+ hours of sunshine this month.
Sydney reveals its true character from the water: harbor ferries, sandstone headlands, ocean pools, and long golden evening light converge in spring and early summer.
December ranks 3rd of 12 for Sydney — one of the best windows
December averages 21°C (70°F) — pleasant for mornings and evenings on foot in the city, with a midday break when the sun is strongest.
Rainfall runs 72 mm, so plan one flexible day in three; you still get about 29 days with 6+ hours of sunshine and 14.4 hours of daylight.
A 8.7/10 puts this among the year's best months in Sydney (3rd of 12); only September scores higher, at 9.2/10.
Pack light clothing, a hat and real sun protection, a packable rain layer.
Figure on peak pricing, with crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Sydney in December?
- In December, Sydney averages 21°C, 72 mm of rain, and about 29 days with 6+ hours of sunshine. Its climate-comfort score is 8.7/10.
- Is December a good time to visit Sydney?
- December earns a 8.7/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Sydney in December?
- Expect about 72 mm of rain in December. Average humidity is 73% and there are about 29 days with 6+ hours of sunshine.
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