Buenos Aires weather in September
Buenos Aires in September averages 15°C (58°F), 58 mm of rain and 6.3 hours of sun a day.
Of the twelve months in Buenos Aires, September is the fourth coldest, the fourth driest and the sixth dullest.
- Average temp
- 15°C (58°F)
11–18°C · 52–64°F
- Rainfall
- 58 mm
Showers likely
- Sunshine
- 6.3 h
hours per day
What is Buenos Aires like in September?
Daytime
Days are mild.
Rain
Some rain is likely; pack for showers.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for Buenos Aires in September?
A light rain jacket
About 58 mm falls this month — showers rather than washouts.
A warm mid-layer
Nights drop to around 11°C (52°F).
September compared with August and October
September in Buenos Aires is 1.3°C warmer than August and about as wet as it, which averages 13°C (56°F).
September in Buenos Aires is 3.4°C cooler than October and 40 mm drier than it, which averages 18°C (64°F).
Daylight in Buenos Aires in September
On 15 September the sun is up for 11 hours 53 minutes in Buenos Aires, rising about 06:52 and setting about 18:45 local time.
September ends 1 hour 1 minute longer than it begins, so the last week of the month is a different length of day from the first.
That is 2 hours 35 minutes short of December, the longest-lit month here.
Where to stay in Buenos Aires
Dates are a starting point for September.
Travel guides for Buenos Aires
What to read before you book.
Buenos Aires weather by month
TemperatureRainfall
How September compares with the rest of the year
September is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 25°C / 76°F | 135 mm |
| February | 23°C / 74°F | 94 mm |
| March | 22°C / 72°F | 123 mm |
| April | 18°C / 65°F | 122 mm |
| May | 15°C / 60°F | 85 mm |
| June | 12°C / 54°F | 54 mm |
| July | 11°C / 53°F | 50 mm |
| August | 13°C / 56°F | 52 mm |
| September | 15°C / 58°F | 58 mm |
| October | 18°C / 64°F | 98 mm |
| November | 21°C / 69°F | 87 mm |
| December | 23°C / 74°F | 107 mm |
Check another month
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FAQs about Buenos Aires in September
September climate averages for Buenos Aires, 1991–2020.
Buenos Aires averages 15°C (58°F) in September, ranging from about 11°C (52°F) at night to 18°C (64°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Some. About 58 mm falls across September, enough to need a light jacket but not enough to reshape a trip.
No. September averages 15°C (58°F) against 18°C (64°F) in October — 3.4°C cooler.
September is 1.3°C warmer than August, and about as wet.
It is outside the easiest window. The most comfortable stretch here is February to April; September sits outside it, which usually means more heat, more rain, or both — worth it if you would rather have the place to yourself.
About 6.3 hours of sun a day on the 1991–2020 average.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what September is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 11 hours 53 minutes of daylight in mid-September, against 14 hours 28 minutes in December and 9 hours 51 minutes in June.
On 15 September, sunrise is about 06:52 and sunset about 18:45 local time. Both shift across the month — the month ends 1 hour 1 minute longer than it starts.
