Boston · May
Run in the morning.
Cool month: average high 67°F, low 50°F. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
Avg high / low
67° / 50°F
Humidity
69%
Rain days
14/mo
Wind
13 mph
What May feels like in Boston
Sunrise
05:22
Mid-month average
Sunset
19:59
Mid-month average
Time-of-day breakdown
Morning
Steady cool air, low wind, and good light. The standard runner window in most months.
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 May
The kit for May in Boston: a long-sleeve or light jacket for the first mile, a water-resistant cap or jacket on standby.
May vs the surrounding months
vs April
+12° avg high
0 rain days
Boston in April →
May
67°F avg high
14 rain days
Best: morning
vs June
-9° avg high
0 rain days
Boston in June →
Frequently Asked Questions
What is the best time of day to run in Boston in May?+
Morning. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
What's the average temperature in Boston in May?+
Average high 67°F, average low 50°F.
How does May compare to surrounding months in Boston?+
Compared to April (avg high 56°F), May is warmer. Compared to June (avg high 76°F), May is cooler.
Does it rain often in Boston in May?+
Expect about 14 measurable rain days in May, on average.