Philadelphia · August
Run in the morning.
Comfortable average high of 85°F, dipping to 68°F at night. Expect 16 rain days — plan around the radar. Humidity rises with the sun — morning runs catch the driest, coolest window.
Avg high / low
85° / 68°F
Humidity
70%
Rain days
16/mo
Wind
9 mph
What August feels like in Philadelphia
Sunrise
06:13
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
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 Philadelphia in August
The kit for August in Philadelphia: shorts and a short-sleeve are the standard kit, a water-resistant cap or jacket on standby.
August vs the surrounding months
vs July
-2° avg high
-2 rain days
Philadelphia in July →
August
85°F avg high
16 rain days
Best: morning
vs September
+6° avg high
+4 rain days
Philadelphia in September →
Frequently Asked Questions
What is the best time of day to run in Philadelphia in August?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in Philadelphia in August?+
Average high 85°F, average low 68°F.
How does August compare to surrounding months in Philadelphia?+
Compared to July (avg high 87°F), August is cooler. Compared to September (avg high 79°F), August is warmer.
Does it rain often in Philadelphia in August?+
Expect about 16 measurable rain days in August, on average.