Sydney weather in December
December in Sydney: warm, a little rain, with clean air — one of the best months to visit.
#2 of 12 months in Sydney · #18 of 604 destinations to visit in December · comfort 91/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Sydney climate normals — December
| Daytime high | 24°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 18°C / 65°F | |
| Feels like (high) | 26°C / 79°F | |
| Rainfall | 54 mm / 2.1 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 15°C / 59°F | |
| Sunshine | 11.1 h/day | |
| Daylight | 14.4 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 49 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Sydney in December — FAQ
- Is December a good time to visit Sydney?
- December in Sydney: warm, a little rain, with clean air — one of the best months to visit. It ranks #2 of 12 months for Sydney on SeasonMap's comfort score (91/100).
- What is the weather like in Sydney in December?
- In December, Sydney averages a daily high of 24.4°C and a low of 18.1°C, with about 53.7 mm of rain over roughly 9.4 rainy days.
- What is the air quality in Sydney in December?
- Sydney has a mean US Air Quality Index of about 49 in December.