Avg high
26°C
Avg low
17°C
Rainfall
72 mm
Rain days
10.5
Sunshine
11.5 h/day
Daylight
14.2 h
What to pack for Sydney in December
- t-shirts and light layers
- a light jacket for evenings
- a compact umbrella or rain shell — rain is frequent
Humidity averages 73%; max daily wind around 23 km/h.
How December compares
Best months in Sydney: April–May & August–September & December. See the full best time to visit Sydney guide.
Sydney in December: the details
In December, Sydney sees average daytime highs of 26°C (78°F) and overnight lows of 17°C (63°F). Rainfall totals roughly 72 mm across 10.5 rainy days, and the sun shines about 11.5 hours per day with 14.2 hours of daylight mid-month. Relative humidity averages 73%.
These figures are climate normals computed from the ERA5 weather reanalysis (2019–2024) for Sydney, Australia (-33.87, 151.21) — see our methodology. Actual conditions vary year to year.
Where should you go next month?
Get one email a month with the destinations at their seasonal best. Double opt-in, unsubscribe anytime.