Buenos Aires · September
Run in the morning.
Cool month: average high 64°F, low 52°F. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
Avg high / low
64° / 52°F
Humidity
75%
Rain days
10/mo
Wind
15 mph
What September feels like in Buenos Aires
Sunrise
06:51
Mid-month average
Sunset
18:45
Mid-month average
Time-of-day breakdown
Morning
Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.
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 Buenos Aires in September
The kit for September in Buenos Aires: shorts and a short-sleeve are the standard kit, a wind-blocking layer for exposed routes.
September vs the surrounding months
vs August
+3° avg high
+2 rain days
Buenos Aires in August →
September
64°F avg high
10 rain days
Best: morning
vs October
-5° avg high
-3 rain days
Buenos Aires in October →
Frequently Asked Questions
What is the best time of day to run in Buenos Aires in September?+
Morning. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
What's the average temperature in Buenos Aires in September?+
Average high 64°F, average low 52°F.
How does September compare to surrounding months in Buenos Aires?+
Compared to August (avg high 61°F), September is warmer. Compared to October (avg high 69°F), September is cooler.
Does it rain often in Buenos Aires in September?+
Expect about 10 measurable rain days in September, on average.