Typical Run Score
80
Great
Boston · September
Running in Boston in September
Typical September running conditions in Boston — and a live Run Score so you can see how today compares with the norm.
Avg temperature
65°F
Warm
Avg dew point
56°F
Pleasant
Best window
6–9 AM
Local time
Boston · today vs the September normTemperature · dew point · wind · timing
How September compares in Boston
September ranks 5th of 12 months for running in Boston, with a typical daytime Run Score of 80 (Great). For reference, the best month is October (score 91) and the hardest is July (score 63). The kindest window in September is typically 6–9 AM. Precipitation falls in roughly 17% 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 Boston in September: FAQ
Is it good to run in Boston in September?
Yes — it's one of the better months to run here. The typical daytime Run Score is 80 (Great), with temperatures around 65°F (18°C) and pleasant dew points. The best window is usually 6–9 AM.
How hot is it for running in Boston in September?
Typical temperatures average 65°F (18°C) (Warm) with dew points near 56°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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RunWeather syncs with Strava, plans your week, and learns your heat tolerance — so the right time to run finds you.