Typical Run Score
79
Good
Portland · September
Running in Portland in September
Typical September running conditions in Portland — and a live Run Score so you can see how today compares with the norm.
Avg temperature
65°F
Warm
Avg dew point
51°F
Comfortable
Best window
6–9 AM
Local time
Portland · today vs the September normTemperature · dew point · wind · timing
How September compares in Portland
September ranks 10th of 12 months for running in Portland, with a typical daytime Run Score of 79 (Good). For reference, the best month is May (score 91) and the hardest is August (score 70). The kindest window in September is typically 6–9 AM. Precipitation falls in roughly 10% of hours this month. Use the live tool below to see how today actually compares with the September norm.
Running weather in nearby cities
Same engine, different climate. Check the best time to run in these cities too.
Running in Portland in September: FAQ
Is it good to run in Portland in September?
Generally yes, with sensible timing. The typical daytime Run Score is 79 (Good), with temperatures around 65°F (18°C) and comfortable dew points. The best window is usually 6–9 AM.
How hot is it for running in Portland in September?
Typical temperatures average 65°F (18°C) (Warm) with dew points near 51°F. Dew point — not the thermometer — usually decides how hard the run feels.
What is a good Run Score?
Scores run 0–100. 97+ is Perfect, 80–96 is Great — conditions are actively working in your favour. 65–79 (Good) is solid. 45–64 (Mixed) means at least one factor — usually heat or dew point — is taxing you. Below 45 (Poor), expect a noticeably harder effort or hold back for safety.
Why does dew point matter more than temperature?
Your body cools by evaporating sweat. When the dew point climbs above roughly 60°F, the air is too saturated for sweat to evaporate efficiently, so heat builds up even if the thermometer looks reasonable. That's why a 70°F muggy morning can feel harder than a dry 80°F afternoon.
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