Baltimore · September
Run in the morning.
Comfortable average high of 79°F, dipping to 63°F at night. Humidity rises with the sun — morning runs catch the driest, coolest window.
Avg high / low
79° / 63°F
Humidity
74%
Rain days
14/mo
Wind
10 mph
What September feels like in Baltimore
Sunrise
06:48
Mid-month average
Sunset
19:14
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 Baltimore in September
The kit for September in Baltimore: shorts and a short-sleeve are the standard kit, a water-resistant cap or jacket on standby.
September vs the surrounding months
vs August
-5° avg high
-4 rain days
Baltimore in August →
September
79°F avg high
14 rain days
Best: morning
vs October
+11° avg high
0 rain days
Baltimore in October →
Frequently Asked Questions
What is the best time of day to run in Baltimore in September?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in Baltimore in September?+
Average high 79°F, average low 63°F.
How does September compare to surrounding months in Baltimore?+
Compared to August (avg high 84°F), September is cooler. Compared to October (avg high 67°F), September is warmer.
Does it rain often in Baltimore in September?+
Expect about 14 measurable rain days in September, on average.