Portland · September
Run in the morning.
Comfortable average high of 75°F, dipping to 55°F at night. Comfortable conditions all day, but morning consistently delivers the best combination of cool air and clear skies.
Avg high / low
75° / 55°F
Humidity
67%
Rain days
10/mo
Wind
9 mph
What September feels like in Portland
Sunrise
06:50
Mid-month average
Sunset
19:20
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 Portland in September
The kit for September in Portland: shorts and a short-sleeve are the standard kit.
September vs the surrounding months
vs August
-9° avg high
+6 rain days
Portland in August →
September
75°F avg high
10 rain days
Best: morning
vs October
+12° avg high
-5 rain days
Portland in October →
Frequently Asked Questions
What is the best time of day to run in Portland in September?+
Morning. Comfortable conditions all day, but morning consistently delivers the best combination of cool air and clear skies.
What's the average temperature in Portland in September?+
Average high 75°F, average low 55°F.
How does September compare to surrounding months in Portland?+
Compared to August (avg high 84°F), September is cooler. Compared to October (avg high 63°F), September is warmer.
Does it rain often in Portland in September?+
Expect about 10 measurable rain days in September, on average.