Buenos Aires in September
In September, Buenos Aires averages 19°C (66°F) during the day and 11°C (52°F) at night, with around 7 days of rain (85 mm total).
High seasonConditions are comfortable for sightseeing without being sweltering. Occasional showers are likely but won't dominate.
September is a great month to visit Buenos Aires: pleasant temperatures and relatively few wet days.
How September compares to the rest of the year in Buenos Aires
September is in the middle of the year for warmth in Buenos Aires (9th of 12) and moderately rainy compared to the rest of the year (9th of 12). Daytime temperature runs 4°C below the annual average (23°C). September runs 2°C warmer than August (17°C) and warms a further 3°C into October (22°C).
September sunrise & sunset in Buenos Aires
Times shown for Buenos Aires local time (America/Argentina/Buenos_Aires), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Buenos Aires — September
Golden-hour and blue-hour windows for the 15th of September, in Buenos Aires's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Buenos Aires in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (High season) and Buenos Aires's popularity.
Crowds & pricing — September in Buenos Aires
This is a busy month in Buenos Aires — not the absolute peak, but tourist numbers are clearly elevated. You'll feel it at headline attractions on weekends and in the historic centre, though side streets and lesser-known sights stay manageable. Prices are above off-season but not at their summit. A good week for first-time visitors who want everything open without the worst of the crush.
Why this tier: excellent tourism weather
Sun & mosquito risk — September in Buenos Aires
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Buenos Aires in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 30°C / 86°F | 20°C / 68°F | 130 mm | 8 | — |
| February | 29°C / 84°F | 20°C / 68°F | 125 mm | 7 | — |
| March | 27°C / 81°F | 18°C / 64°F | 150 mm | 7 | — |
| April | 22°C / 72°F | 15°C / 59°F | 110 mm | 7 | — |
| May | 19°C / 66°F | 11°C / 52°F | 85 mm | 6 | — |
| June | 15°C / 59°F | 8°C / 46°F | 65 mm | 6 | — |
| July | 15°C / 59°F | 7°C / 45°F | 65 mm | 7 | — |
| August | 17°C / 63°F | 9°C / 48°F | 75 mm | 6 | — |
| September | 19°C / 66°F | 11°C / 52°F | 85 mm | 7 | — |
| October | 22°C / 72°F | 14°C / 57°F | 125 mm | 8 | — |
| November | 26°C / 79°F | 17°C / 63°F | 125 mm | 8 | — |
| December | 29°C / 84°F | 19°C / 66°F | 130 mm | 8 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Buenos Aires in September →
Frequently asked questions
How hot is Buenos Aires in September?
In September, Buenos Aires averages a high of 19°C (66°F) and a low of 11°C (52°F) — generally mild and pleasant.
Does it rain a lot in Buenos Aires in September?
September sees occasional rain in Buenos Aires, with about 7 rainy days on average.
Is September a good time to visit Buenos Aires?
September is mild and pleasant. It suits travelers who are comfortable with mild and pleasant weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Buenos Aires in September?
Pack light layers for warm days and cooler evenings. See the full September packing list for Buenos Aires for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.