Monthly climate guide
Sydney weather in December
Expect warm weather in Sydney in December: afternoons reach about 25°C (76°F), while nights drop to around 19°C (66°F). Around 74 mm of rain falls over the month (some rain), and skies are often cloudy. Daytime highs are about the same as November and about the same as January.
What stands out in December
- Comfortable temperatures make it easy to walk between Bondi Beach and Sydney Opera House.
- Seasonally, December counts as early summer in Sydney — the seasons are reversed south of the equator.
- Compared with Airlie Beach, Sydney runs roughly 5°C cooler this month.
- Only 2 months are warmer in Sydney than December.
Avg high
25°C
76°F
Avg low
19°C
66°F
Rainfall
74 mm
some rain
Humidity
74%
relative
Sky
59%
cloud · often cloudy
Sydney weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 26°C / 79°F | 21°C / 69°F | 96 mm | 76% | 59% |
| February | 25°C / 78°F | 21°C / 70°F | 119 mm | 76% | 60% |
| March | 24°C / 76°F | 20°C / 68°F | 130 mm | 76% | 62% |
| April | 22°C / 72°F | 18°C / 64°F | 78 mm | 74% | 55% |
| May | 20°C / 67°F | 15°C / 58°F | 33 mm | 71% | 52% |
| June | 17°C / 63°F | 13°C / 56°F | 84 mm | 75% | 60% |
| July | 17°C / 62°F | 12°C / 53°F | 39 mm | 71% | 48% |
| August | 17°C / 63°F | 12°C / 53°F | 52 mm | 69% | 48% |
| September | 20°C / 67°F | 14°C / 57°F | 38 mm | 68% | 48% |
| October | 22°C / 71°F | 16°C / 60°F | 57 mm | 70% | 55% |
| November | 23°C / 74°F | 17°C / 63°F | 77 mm | 72% | 59% |
| December | 25°C / 76°F | 19°C / 66°F | 74 mm | 74% | 59% |
What to pack for December
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is December a good time to visit Sydney?
Our Sydney guide recommends: September to November or March to May — Southern Hemisphere spring and autumn, avoiding peak summer crowds and heat.
Remember Australia's seasons are reversed from the Northern Hemisphere — 'summer' here runs December to February.
Best time to visit Sydney →Other Australia cities in December
Cite or embed this data
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Sydney weather in December. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/australia/sydney/december
<a href="https://weathercompare.eu/weather/australia/sydney/december">Sydney weather in December</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/australia/sydney" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Sydney weather in December"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/australia/sydney/december">Sydney weather in December</a> – WeatherCompare</p>
Sydney in December: quick answers
Is December a good time to visit Sydney?
December is a reasonable time for Sydney: highs around 25°C and about 74 mm of rain, though not one of the three best months.
How warm is Sydney in December?
Average highs are about 25°C (76°F) and average lows about 19°C (66°F), based on 10 years of daily data.
Does it rain a lot in Sydney in December?
Sydney typically gets around 74 mm of rain in December — some rain.
When is the best time to visit Sydney?
September to November or March to May — Southern Hemisphere spring and autumn, avoiding peak summer crowds and heat.
Figures are long-term averages for the area around Sydney (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.