September · Argentina
Best time to visit Buenos Aires in September Weather, crowds & prices
Weather in Buenos Aires in September
Average temperature 15°C, 70 mm of rain, about 24 days with 6+ hours of sunshine and 73% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.6/10
Ranked #2 of 12 months
- Avg temp
- 15°C
- Rainfall
- 70 mm
- Humidity
- 73%
- Days with 6h+ sun
- 24
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Buenos Aires scores 8.6/10 for sightseeing and cultural travel - one of the top 12-month picks (#2). Expect around 15°C, 70 mm of rain, and roughly 24 days with 6+ hours of sunshine this month.
Tango nights, steakhouse culture, and European-style avenues shine November through March.
September ranks 2nd of 12 for Buenos Aires — one of the best windows
Temperatures hover around 15°C (58°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 70 mm of rain this month — a flexible day or two helps — with about 24 days with 6+ hours of sunshine and 11.9 hours of daylight to work around it.
On our climate-comfort scale this is one of the strongest months of the year for Buenos Aires at 8.6/10 (2nd of 12), just behind October at 9.2/10.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Budget for mid-season pricing, and crowds are moderate.
Frequently asked
- What is the weather like in Buenos Aires in September?
- In September, Buenos Aires averages 15°C, 70 mm of rain, and about 24 days with 6+ hours of sunshine. Its climate-comfort score is 8.6/10.
- Is September a good time to visit Buenos Aires?
- September earns a 8.6/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Buenos Aires in September?
- Expect about 70 mm of rain in September. Average humidity is 73% and there are about 24 days with 6+ hours of sunshine.
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