Osaka · August
Run in the pre-dawn.
Average high is 89°F with a 77°F overnight low. Humidity averages 76% — 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
89° / 77°F
Humidity
76%
Rain days
18/mo
Wind
13 mph
What August feels like in Osaka
Sunrise
05:19
Mid-month average
Sunset
18:44
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 Osaka in August
The kit for August in Osaka: 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
+3° avg high
-1 rain days
Osaka in July →
August
89°F avg high
18 rain days
Best: pre-dawn
vs September
+7° avg high
+1 rain days
Osaka in September →
Frequently Asked Questions
What is the best time of day to run in Osaka 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 Osaka in August?+
Average high 89°F, average low 77°F.
How does August compare to surrounding months in Osaka?+
Compared to July (avg high 86°F), August is warmer. Compared to September (avg high 83°F), August is warmer.
Does it rain often in Osaka in August?+
Expect about 18 measurable rain days in August, on average.