Rio de Janeiro · August
Run in the morning.
Comfortable average high of 77°F, dipping to 64°F at night. Humidity averages 78% — the limiting factor on most runs. Humidity rises with the sun — morning runs catch the driest, coolest window.
Avg high / low
77° / 64°F
Humidity
78%
Rain days
12/mo
Wind
10 mph
What August feels like in Rio de Janeiro
Sunrise
06:16
Mid-month average
Sunset
17:37
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 August
The kit for August in Rio de Janeiro: shorts and a short-sleeve are the standard kit, a water-resistant cap or jacket on standby.
August vs the surrounding months
vs July
+1° avg high
+3 rain days
Rio de Janeiro in July →
August
77°F avg high
12 rain days
Best: morning
vs September
-2° avg high
-1 rain days
Rio de Janeiro in September →
Frequently Asked Questions
What is the best time of day to run in Rio de Janeiro in August?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in Rio de Janeiro in August?+
Average high 77°F, average low 64°F.
How does August compare to surrounding months in Rio de Janeiro?+
Compared to July (avg high 77°F), August is warmer. Compared to September (avg high 80°F), August is cooler.
Does it rain often in Rio de Janeiro in August?+
Expect about 12 measurable rain days in August, on average.