Monthly climate averages for Sydney, Australia. Based on 10-year ERA5 reanalysis data.
Cfa Humid Subtropical
Climate OverviewSydney, Australia in December has warm conditions, with highs averaging 25.1°C (77°F). Sea temperature averages 20.8°C (69°F).
This month falls at the beginning of Summer.
Temperatures remain fairly steady throughout December, with daily highs around 25°C (77°F).
December sees fairly even rainfall, totalling about 58 mm across the month.
The warmest days tend to fall around the 31th, averaging 26.1°C (79°F).
Compared to November, this month is about 2°C warmer with 1 more rainy days.
Daily averages based on historical data (2016–2025)
Daytime temperatures around 25°C (77°F) are ideal for full-day outdoor exploration.
Rain usually comes in shorter passing showers rather than all-day rain.
1 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January best | 26°C / 20°C | 29°C / 22°C | 10days (79 mm) Wet | 10.3h Excellent | 75% Muggy | 7.9 Very High | Excellent | View Details |
| February best | 26°C / 20°C | 28°C / 22°C | 11days (88 mm) Wet | 10.3h Excellent | 74% Muggy | 7.4 Very High | Excellent | View Details |
| March best | 24°C / 19°C | 26°C / 20°C | 14days (129 mm) Wet | 9.2h Good | 76% Humid | 6.6 High | Excellent | View Details |
| April best | 22°C / 16°C | 22°C / 16°C | 8days (57 mm) Wet | 9.2h Good | 74% Muggy | 5 Moderate | Excellent | View Details |
| May | 19°C / 13°C | 18°C / 12°C | 7days (55 mm) Good | 8.4h Good | 72% Muggy | 3.5 Moderate | Good | View Details |
| June | 16°C / 10°C | 15°C / 8°C | 7days (54 mm) Good | 7.8h Good | 73% Muggy | 3.1 Moderate | Good | View Details |
| July | 16°C / 10°C | 14°C / 7°C | 6days (63 mm) Good | 8.3h Good | 70% Muggy | 3.4 Moderate | Good | View Details |
| August | 17°C / 10°C | 15°C / 8°C | 6days (48 mm) Good | 9h Good | 68% Muggy | 4.2 Moderate | Good | View Details |
| September | 20°C / 12°C | 19°C / 11°C | 6days (43 mm) Good | 10h Excellent | 66% Muggy | 6 High | Good | View Details |
| October | 22°C / 15°C | 22°C / 14°C | 9days (62 mm) Wet | 10.3h Excellent | 69% Muggy | 7.2 Very High | Good | View Details |
| November best | 23°C / 17°C | 24°C / 17°C | 8days (58 mm) Wet | 10.9h Excellent | 70% Muggy | 7.7 Very High | Excellent | View Details |
| December | 25°C / 19°C | 27°C / 19°C | 9days (58 mm) Wet | 11.2h Excellent | 71% Muggy | 8.4 Very High | Excellent | View Details |
Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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