Miami · August
Run in the pre-dawn.
Average high is 87°F with a 79°F overnight low. Humidity averages 78% — the limiting factor on most runs. Expect 28 rain days — plan around the radar. Humid heat punishes mid-morning — get out before sunrise for the only truly comfortable window.
Avg high / low
87° / 79°F
Humidity
78%
Rain days
28/mo
Wind
11 mph
What August feels like in Miami
Sunrise
06:54
Mid-month average
Sunset
19:55
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 Miami in August
The kit for August in Miami: light, breathable, and moisture-wicking — singlet or short-sleeve only, a water-resistant cap or jacket on standby.
August vs the surrounding months
vs July
0° avg high
0 rain days
Miami in July →
August
87°F avg high
28 rain days
Best: pre-dawn
vs September
+2° avg high
+1 rain days
Miami in September →
Frequently Asked Questions
What is the best time of day to run in Miami in August?+
Pre-dawn. Humid heat punishes mid-morning — get out before sunrise for the only truly comfortable window.
What's the average temperature in Miami in August?+
Average high 87°F, average low 79°F.
How does August compare to surrounding months in Miami?+
Compared to July (avg high 87°F), August is warmer. Compared to September (avg high 86°F), August is warmer.
Does it rain often in Miami in August?+
Expect about 28 measurable rain days in August, on average.