Sydney Weather in December
Australia · Oceanic climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
December in Sydney sees average temperatures ranging from a low of 17.2°C (63.0°F) to a high of 25.0°C (77.0°F), with a mean of 21.0°C (69.8°F). Compared to the annual average of 17.3°C (63.1°F), this month is 3.7°C warmer than the yearly norm. Precipitation averages 83.1mm, making it approximately 17.0mm drier than the monthly average of 100.0mm. The city receives an average of 11.2 hours of sunshine per day during December, with relative humidity averaging 74.6%. Wind speeds reach an average maximum of 22.7 km/h. For travelers, this month offers a temperature experience in Sydney, with drier-than-average conditions compared to the rest of the year.
The numbers show something travelers often miss: Sydney's 'winter' (June-August) averages 17°C — warmer than London's summer. I spent a July there expecting cold and instead got perfect hiking weather. The real challenge is the UV index in summer (December-February). The data is clear: if you're planning beach days, March-April give you warmth without the extreme UV. Christmas on the beach still feels wrong to me, but the locals love it.
December vs Adjacent Months
| Metric | November | December | January |
|---|---|---|---|
| Mean Temp | 19.2°C (66.6°F) | 21.0°C (69.8°F) | 22.5°C (72.5°F) |
| Rainfall | 100.7mm | 83.1mm | 114.8mm |
| Sunshine | 10.4 hrs | 11.2 hrs | 10.9 hrs |
| Humidity | 75.0% | 74.6% | 77.8% |
| Wind | 22.5 km/h | 22.7 km/h | 22.5 km/h |
| Rainy Days | 19.2 | 21.0 | 20.8 |
Seasonal Context
December falls in Winter in the Northern Hemisphere. Winter is the coolest season with the shortest daylight hours. For travelers visiting Sydney in December, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Sydney in December?
The average temperature in Sydney during December ranges from 17.2°C (63.0°F) to 25.0°C (77.0°F), with a mean of 21.0°C (69.8°F).
How much does it rain in Sydney in December?
Sydney receives an average of 83.1mm of precipitation in December, spread across approximately 21.0 rainy days.
What should I pack for Sydney in December?
Based on December weather data, pack layers including light jackets and t-shirts, plus an umbrella.
Is December a good time to visit Sydney?
December is a good time to visit Sydney, with comfortable temperatures and manageable rainfall.
Other Months for Sydney
Cities with Similar December Climate (Oceanic)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: -33.87°, 151.21°. Timezone: Australia/Sydney. Last updated: 2026-07-30.