Weather in Buenos Aires in September
As an Amazon Associate we earn from qualifying purchases. We also earn commission from other retail partners. Links below are affiliate links.
Book now, pay at pickup — compare Hertz, Avis, Budget, Sixt and 800+ rental companies for September in Buenos Aires.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youBuenos Aires in September is pleasantly mild — daytime temperatures average 17.6°C, dropping to 10.7°C at night. The month is moderately rainy (6 rainy days), with roughly 8.8 hours of sunshine a day. This is peak season for good reason — conditions are close to ideal. For the complete picture, see the best time to visit Buenos Aires — every month compared. Once you know when to go, find your Buenos Aires packing list at 247PackingList.
Get ready for Buenos Aires in September
Search flights to Buenos Aires
Compare 100+ airlines for September — one search, best price.
Search Flights →Travel clothing layers
Pack layers — temperatures can vary significantly between day and night.
Check Price →Secure WiFi abroad
Protect your devices on hotel and airport WiFi in Buenos Aires.
Get NordVPN →What to pack for Buenos Aires in September
- Warm layers
- Light jacket or fleece
- Comfortable walking shoes
- Light waterproof layer
Compare all months in Buenos Aires
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 28.6°C | 82.7mm | 10/10 |
| February | 27.1°C | 73.7mm | 10/10 |
| March | 25.6°C | 139.4mm | 9/10 |
| April | 21.2°C | 87.6mm | 10/10 |
| May | 17.5°C | 54.2mm | 10/10 |
| June | 14.3°C | 30.5mm | 10/10 |
| July | 14.2°C | 50.3mm | 10/10 |
| August | 16.0°C | 33.8mm | 10/10 |
| September | 17.6°C | 74.3mm | 10/10 |
| October | 21.1°C | 64.3mm | 10/10 |
| November | 24.8°C | 79.5mm | 10/10 |
| December | 27.0°C | 73.0mm | 10/10 |
Full month-by-month guide: best time to visit Buenos Aires →
For facts about Argentina — currency, language and dialling code — see our Argentina country guide at 247CountryInfo. Travellers also find it useful to keep a Buenos Aires travel guide to hand. Check clothing sizes in Argentina before you shop.
Frequently Asked Questions
Is September a good time to visit Buenos Aires?
September rates 10/10 for visiting Buenos Aires — excellent time to visit. Expect average highs of 17.6°C, 74.3mm of rain across the month and about 8.8 hours of daily sunshine.
What is the temperature in Buenos Aires in September?
In September, Buenos Aires has average highs of 17.6°C (63.7°F) and average lows of 10.7°C (51.3°F).
Does it rain in Buenos Aires in September?
Some rain is likely. Buenos Aires averages 74.3mm across about 6 rainy days in September, so a light waterproof layer is worth packing.
What should I wear in Buenos Aires in September?
For Buenos Aires in September (17.6°C highs / 10.7°C lows), pack warm layers plus light jacket or fleece, comfortable walking shoes, light waterproof layer.
More essentials for Buenos Aires in September
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
Check Price →Last updated:
Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.