St. Louis · May
Run in the morning.
Comfortable average high of 76°F, dipping to 58°F at night. Expect 18 rain days — plan around the radar. Humidity rises with the sun — morning runs catch the driest, coolest window.
Avg high / low
76° / 58°F
Humidity
70%
Rain days
18/mo
Wind
12 mph
What May feels like in St. Louis
Sunrise
05:48
Mid-month average
Sunset
20:06
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 St. Louis in May
The kit for May in St. Louis: shorts and a short-sleeve are the standard kit, a water-resistant cap or jacket on standby.
May vs the surrounding months
vs April
+10° avg high
+4 rain days
St. Louis in April →
May
76°F avg high
18 rain days
Best: morning
vs June
-10° avg high
+3 rain days
St. Louis in June →
Frequently Asked Questions
What is the best time of day to run in St. Louis in May?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in St. Louis in May?+
Average high 76°F, average low 58°F.
How does May compare to surrounding months in St. Louis?+
Compared to April (avg high 66°F), May is warmer. Compared to June (avg high 86°F), May is cooler.
Does it rain often in St. Louis in May?+
Expect about 18 measurable rain days in May, on average.