Best Time to Run in Rio de Janeiro in December

The verdict: Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.

Rio de Janeiro · December

Run in the morning.

Comfortable average high of 85°F, dipping to 73°F at night. Humidity averages 80% — the limiting factor on most runs. Expect 20 rain days — plan around the radar. Humidity rises with the sun — morning runs catch the driest, coolest window.

Avg high / low
85° / 73°F
Humidity
80%
Rain days
20/mo
Wind
10 mph

What December feels like in Rio de Janeiro

Sunrise

05:03

Mid-month average

Sunset

18:34

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 Rio de Janeiro in December

The kit for December in Rio de Janeiro: shorts and a short-sleeve are the standard kit, a water-resistant cap or jacket on standby.

Frequently Asked Questions

What is the best time of day to run in Rio de Janeiro in December?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in Rio de Janeiro in December?+
Average high 85°F, average low 73°F.
How does December compare to surrounding months in Rio de Janeiro?+
Compared to November (avg high 81°F), December is warmer. Compared to January (avg high 88°F), December is cooler.
Does it rain often in Rio de Janeiro in December?+
Expect about 20 measurable rain days in December, on average.

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