Boston · August
Run in the morning.
Comfortable average high of 82°F, dipping to 65°F at night. Humidity rises with the sun — morning runs catch the driest, coolest window.
Avg high / low
82° / 65°F
Humidity
72%
Rain days
13/mo
Wind
11 mph
What August feels like in Boston
Sunrise
05:53
Mid-month average
Sunset
19:43
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 Boston in August
The kit for August in Boston: 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
-2 rain days
Boston in July →
August
82°F avg high
13 rain days
Best: morning
vs September
+7° avg high
+1 rain days
Boston in September →
Frequently Asked Questions
What is the best time of day to run in Boston in August?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in Boston in August?+
Average high 82°F, average low 65°F.
How does August compare to surrounding months in Boston?+
Compared to July (avg high 83°F), August is cooler. Compared to September (avg high 74°F), August is warmer.
Does it rain often in Boston in August?+
Expect about 13 measurable rain days in August, on average.