What to pack for Buenos Aires in September
- long sleeves and a warm layer
- a medium jacket
- a packable rain layer
Humidity averages 73%; max daily wind around 24 km/h.
How September compares
Best months in Buenos Aires: February–May & September–December. See the full best time to visit Buenos Aires guide.
Buenos Aires in September: the details
In September, Buenos Aires sees average daytime highs of 18°C (65°F) and overnight lows of 11°C (51°F). Rainfall totals roughly 56 mm across 5.5 rainy days, and the sun shines about 9.2 hours per day with 11.8 hours of daylight mid-month. Relative humidity averages 73%.
In context: September is the 8th-warmest month and the 10th-wettest in Buenos Aires. The sunniest month is December (12.4 h/day).
| Metric | September average |
|---|---|
| Daytime high | 18°C / 65°F |
| Overnight low | 11°C / 51°F |
| Rainfall | 56 mm over 5.5 rainy days |
| Sunshine | 9.2 h/day (11.8 h daylight) |
| Humidity | 73% |
| Travel score | 10.0 / 10 |
These figures are climate normals computed from the ERA5 weather reanalysis (2019–2024) for Buenos Aires, Argentina (-34.61, -58.38) — see our methodology. Actual conditions vary year to year.
Not set on Buenos Aires? Browse the best places to visit in September ranked by travel score.
Frequently asked questions
How hot is Buenos Aires in September?
Daytime highs in Buenos Aires in September average 18°C (65°F); nights drop to about 11°C.
Does it rain in Buenos Aires in September?
Expect around 5.5 rainy days and 56 mm of rainfall in September.
Is September a good time to visit Buenos Aires?
September is one of the best months to visit Buenos Aires. Overall travel score: 10.0/10. The best months are February–May & September–December.
Also good in September, near Buenos Aires
Where should you go next month?
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