Typical Run Score
71
Good
San Diego · September
Running in San Diego in September
Typical September running conditions in San Diego — and a live Run Score so you can see how today compares with the norm.
Avg temperature
71°F
Warm
Avg dew point
62°F
Noticeable
Best window
6–9 AM
Local time
San Diego · today vs the September normTemperature · dew point · wind · timing
How September compares in San Diego
September ranks 11th of 12 months for running in San Diego, with a typical daytime Run Score of 71 (Good). For reference, the best month is January (score 92) and the hardest is August (score 69). The kindest window in September is typically 6–9 AM. Precipitation falls in roughly 5% 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 San Diego in September: FAQ
Is it good to run in San Diego in September?
Generally yes, with sensible timing. The typical daytime Run Score is 71 (Good), with temperatures around 71°F (21°C) and noticeable dew points. The best window is usually 6–9 AM.
How hot is it for running in San Diego in September?
Typical temperatures average 71°F (21°C) (Warm) with dew points near 62°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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