Buenos Aires weather in September
Monthly temperatures, rain, humidity, what to wear and what to pack — 2024–2025 historical average
Buenos Aires September weather at a glance
In September, Buenos Aires averages 15.4°C, with typical highs of 19.6°C and lows of 11.4°C. The historical average is 4 wet days and 69% humidity.
Buenos Aires September temperature & humidity
Buenos Aires September rain & wet days
Pack a compact umbrella. Keep an indoor stop available between outdoor activities.
What to wear in Buenos Aires in September
T-shirts or long sleeves with one light outer layer should be comfortable.
- DaytimeLong sleeves and a light jacket · average high 19.6°C
- Morning & eveningLong sleeves with a jacket or cardigan · average low 11.4°C
- FootwearComfortable walking shoes; quick-dry footwear for rainy days.
Packing essentials
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Buenos Aires September sunrise & sunset times
2026 September · Local time (America/Argentina/Buenos_Aires)
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 2026-09-01 | 07:12 | 18:35 | 11h 23m |
| 2026-09-15 | 06:53 | 18:45 | 11h 52m |
| 2026-09-30 | 06:32 | 18:56 | 12h 24m |
For sunset photos, arrive before the listed sunset time. Clouds, mountains and buildings can change when the sun becomes visible or disappears.
Calculated for the city coordinates with daylight saving applied. SunCalc · tz-lookup
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Best months to visit Buenos Aires
Bar height shows our simple weather-comfort score, not a safety rating; colour shows temperature.
September weather by year
Daily weather in 2025
Daily high and low temperatures; blue labels show precipitation
Frequently asked questions
What is Buenos Aires weather like in September?
In September, Buenos Aires averages 15.4°C, with typical highs of 19.6°C and lows of 11.4°C. The historical average is 4 wet days and 69% humidity. Our weather-comfort rating for this month is excellent.
Does it rain a lot in Buenos Aires in September?
There are about 4 wet days in September. A compact umbrella is still useful.
What should I wear in Buenos Aires in September?
T-shirts or long sleeves with one light outer layer should be comfortable.
What are the best months to visit Buenos Aires?
Recent weather data rates January, February, March, April among the more comfortable months.
Where can I check Buenos Aires weather in September in real time?
Check local webcams for the view right now and a local weather service for today’s forecast. Monthly temperatures here are historical averages.
What time are sunrise and sunset in Buenos Aires in September?
On 2026-09-15, calculated sunrise is 06:53 and sunset is 18:45 in local time (America/Argentina/Buenos_Aires). Times vary by date and terrain.
Buenos Aires weather by month
More Americas destinations in September
Open-Meteo (CC BY 4.0) · 2024–2025 historical data, aggregated and rounded by this site. Not a forecast or long-term climate normal. Calculation method and limitations