Sydney · December
Run in the morning.
Comfortable average high of 78°F, dipping to 64°F at night. Expect 16 rain days — plan around the radar. Humidity rises with the sun — morning runs catch the driest, coolest window.
Avg high / low
78° / 64°F
Humidity
73%
Rain days
16/mo
Wind
14 mph
What December feels like in Sydney
Sunrise
04:40
Mid-month average
Sunset
19:01
Mid-month average
Time-of-day breakdown
Morning
Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.
Midday
Mild but UV and traffic peak. Workable if you don't mind shifting your pace.
Evening
Warm and runnable. Crowded routes but the air's typically calm.
What to wear running in Sydney in December
The kit for December in Sydney: shorts and a short-sleeve are the standard kit, a water-resistant cap or jacket on standby.
December vs the surrounding months
vs November
+4° avg high
+2 rain days
Sydney in November →
December
78°F avg high
16 rain days
Best: morning
vs January
-2° avg high
0 rain days
Sydney in January →
Frequently Asked Questions
What is the best time of day to run in Sydney in December?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in Sydney in December?+
Average high 78°F, average low 64°F.
How does December compare to surrounding months in Sydney?+
Compared to November (avg high 74°F), December is warmer. Compared to January (avg high 80°F), December is cooler.
Does it rain often in Sydney in December?+
Expect about 16 measurable rain days in December, on average.