Rio de Janeiro · January
Run in the pre-dawn.
Average high is 88°F with a 75°F overnight low. Humidity averages 78% — the limiting factor on most runs. Expect 18 rain days — plan around the radar. Humid heat punishes mid-morning — get out before sunrise for the only truly comfortable window.
Avg high / low
88° / 75°F
Humidity
78%
Rain days
18/mo
Wind
9 mph
What January feels like in Rio de Janeiro
Sunrise
05:21
Mid-month average
Sunset
18:42
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
Heat peaks here. Skip unless you've got shade and pace tolerance.
Evening
Cools off after sunset but still warm. Good for easy efforts; avoid hard intervals if you're chasing pace.
What to wear running in Rio de Janeiro in January
The kit for January in Rio de Janeiro: light, breathable, and moisture-wicking — singlet or short-sleeve only, a water-resistant cap or jacket on standby.
January vs the surrounding months
vs December
+3° avg high
-2 rain days
Rio de Janeiro in December →
January
88°F avg high
18 rain days
Best: pre-dawn
vs February
+1° avg high
+1 rain days
Rio de Janeiro in February →
Frequently Asked Questions
What is the best time of day to run in Rio de Janeiro in January?+
Pre-dawn. Humid heat punishes mid-morning — get out before sunrise for the only truly comfortable window.
What's the average temperature in Rio de Janeiro in January?+
Average high 88°F, average low 75°F.
How does January compare to surrounding months in Rio de Janeiro?+
Compared to December (avg high 85°F), January is warmer. Compared to February (avg high 87°F), January is warmer.
Does it rain often in Rio de Janeiro in January?+
Expect about 18 measurable rain days in January, on average.