Typical Run Score
73
Good
Philadelphia · September
Running in Philadelphia in September
Typical September running conditions in Philadelphia — and a live Run Score so you can see how today compares with the norm.
Avg temperature
69°F
Warm
Avg dew point
58°F
Pleasant
Best window
6–9 AM
Local time
Philadelphia · today vs the September normTemperature · dew point · wind · timing
How September compares in Philadelphia
September ranks 9th of 12 months for running in Philadelphia, with a typical daytime Run Score of 73 (Good). For reference, the best month is November (score 89) and the hardest is July (score 56). The kindest window in September is typically 6–9 AM. Precipitation falls in roughly 14% 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 Philadelphia in September: FAQ
Is it good to run in Philadelphia in September?
Generally yes, with sensible timing. The typical daytime Run Score is 73 (Good), with temperatures around 69°F (21°C) and pleasant dew points. The best window is usually 6–9 AM.
How hot is it for running in Philadelphia in September?
Typical temperatures average 69°F (21°C) (Warm) with dew points near 58°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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