01Weather
Buenos Aires weather in September
Afternoons in September average 19.2 °C (67 °F) and nights cool to 11.8 °C (53 °F). The month brings about 127 mm (5.0 in) of rain spread over roughly 8 days. Compared with August it is 1.9 °C warmer; October is 3.2 °C warmer again.
What the averages hide
| In a typical September | Value | What it means |
|---|---|---|
| Warm afternoons (90th percentile) | 23 °C / 74 °F | one day in ten is at least this warm |
| Cool afternoons (10th percentile) | 15 °C / 60 °F | one day in ten stays below this |
| Cold nights (10th percentile) | 8 °C / 47 °F | one night in ten is colder than this |
| Days above 30 °C (86 °F) | 0.3 | per month, average 2016–2025 |
| Nights at or below 0 °C (32 °F) | 0.0 | frost mornings per month |
| Chance of rain on any given day | 27 % | at least 1 mm |
| Hottest / coldest September day 2016–2025 | 30.7 °C / 1.3 °C | extremes in the ten-year record |
02Daylight
Sunrise, sunset and the length of the day
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 1 September | 07:12 | 18:34 | 11.4 h |
| 15 September | 06:52 | 18:44 | 11.9 h |
| 30 September | 06:31 | 18:55 | 12.4 h |
Daylight grows by about 60 minutes over the month. Times are local (America/Argentina/Buenos_Aires).
03Crowds
How busy Buenos Aires is in September
moderate The main sights are moderate in September. What drives it:
- spring begins
- Tango World Cup finals early September
- jacarandas start late
04Public holidays
Public holidays in September 2027
No public holidays in Argentina fall in September, so shops and museums keep normal hours all month.
05Events
What's on in Buenos Aires in September
No major recurring events fall in September.
07Packing
What to pack for Buenos Aires in September
- layers: t-shirt plus a light jacket for evenings
- comfortable walking shoes
- a compact umbrella for occasional showers
08Editor's notes
What the numbers don't tell you
September is early spring, with mild days around 19 °C, the Tango World Cup finals in the first week at the Luna Park and the first blossoms in the Palermo parks. Weather can be changeable with windy days and rain on about seven days. Crowds remain moderate and prices reasonable before the October-November peak. Students' Day on 21 September fills the parks with picnics.
The Buenos Aires Fashion Week and the Casa FOA design show fall in spring. The Colón's season continues. The polo at Hurlingham and Tortugas opens the Triple Crown. Daylight passes twelve hours at the equinox. For the warm, bright month with the jacarandas beginning, see October.
09Compare
Buenos Aires month by month
| Month | High | Low | Rain days | Sun h | Crowds | Verdict |
|---|---|---|---|---|---|---|
| January | 30 °C | 21 °C | 10 | – | moderate | Excellent |
| February | 29 °C | 21 °C | 10 | – | moderate | Excellent |
| March | 26 °C | 19 °C | 9 | – | busy | Good |
| April | 23 °C | 16 °C | 10 | – | busy | Good |
| May | 19 °C | 12 °C | 8 | – | moderate | Excellent |
| June | 16 °C | 9 °C | 6 | – | quiet | Good |
| July | 15 °C | 8 °C | 8 | – | moderate | Good |
| August | 17 °C | 10 °C | 8 | – | quiet | Excellent |
| September | 19 °C | 12 °C | 8 | – | moderate | Excellent |
| October | 22 °C | 14 °C | 10 | – | busy | Good |
| November | 26 °C | 17 °C | 9 | – | busy | Excellent |
| December | 28 °C | 19 °C | 9 | – | busy | Good |
Not sure about September? See the best time to visit Buenos Aires.
10Elsewhere
September in nearby cities
| City | High | Rain days |
|---|---|---|
| Rio de Janeiro in September | 27 °C | – |
| Cancún in September | 32 °C | – |
| Miami in September | 32 °C | 15 |
| Orlando in September | 32 °C | 9 |
| New York City in September | 26 °C | 6 |
| Toronto in September | 23 °C | 8 |
11FAQ
Buenos Aires in September: your questions
Is September a good time to visit Buenos Aires?
September is one of the best months to visit Buenos Aires. Daytime highs average 19 °C (67 °F), rain falls on about 8 days, and hotel arrivals run above the yearly average, so the main sights are moderate.
What is the weather like in Buenos Aires in September?
Expect mild days around 19 °C (67 °F) and nights near 12 °C (53 °F). One September in ten brings afternoons above 23 °C, and one in ten stays below 15 °C.
Does it rain a lot in Buenos Aires in September?
September brings about 127 mm (5.0 in) of rain over roughly 8 days, which is fairly dry by Buenos Aires standards. On any given day the chance of at least 1 mm of rain is 27 percent.
What should I wear in Buenos Aires in September?
Pack layers: t-shirt plus a light jacket for evenings, comfortable walking shoes, a compact umbrella for occasional showers.
Is Buenos Aires crowded in September?
The main sights are moderate in September. Main drivers: spring begins; Tango World Cup finals early September; jacarandas start late.
What time does it get dark in Buenos Aires in September?
Around the middle of September the sun sets at about 18:44 and rises at 06:52, giving 11.9 hours of daylight.