Early spring · Weather & things to do
Buenos Aires in September
Buenos Aires warms up: highs climb to 63°F (17°C), from 59°F in August, with lows of 53°F (12°C) and about 3.3 in (83 mm) of rain.
It scores 84/100 for comfort, 7th of 12, which makes it a solid shoulder-season month.
- Avg high
- 63°F (17°C)
- Avg low
- 53°F (12°C)
- Rain
- 3.3 in (83 mm)
- Humidity
- 78%
- Cloud cover
- 53%
- Daylight
- ~11 h 48 min
- Comfort score
- 84/100 · Great
What September feels like
Days are mild at around 63°F (17°C): comfortable for walking all day, with a layer for the evening.
After dark, temperatures fall to about 53°F (12°C).
Showers are part of the month, adding up to about 3.3 in (83 mm).
Plan around September
September is shoulder season: good weather, a step below the best months (April & May and November – February).
- Comfort improves from 79/100 in August to 84/100.
- September sits inside the Mar – May, Sep – Nov window our Buenos Aires, Mendoza & Iguazú route recommends.
What to pack for September
- A warm layer for eveningslows near 53°F
- Packable rain jacket or umbrellaa shower or two is likely
- Comfortable walking shoesmost picks involve some walking
What to do in Buenos Aires in September
With conditions on your side, the picks below favor time outside.
Recoleta Cemetery
Walled city of ornate mausoleums, including Eva Perón's family tomb.
El Cuartito
Classic 1934 pizzeria serving thick, cheesy porteño pizza and fainá under sports posters.
MALBA
Museum of Latin American art with works by Frida Kahlo, Diego Rivera and Xul Solar.
El Ateneo Grand Splendid
Bookstore inside a 1919 theater, with a cafe on the former stage.
Feria de San Telmo
Sunday antiques and street fair along Calle Defensa, with tango dancers in Plaza Dorrego.
Why now September scores 84/100 for comfort, good conditions for being outside.
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Buenos Aires in September: quick answers
Is September a good time to visit Buenos Aires?
It's a good shoulder-season choice, scoring 84/100 against a best of 89 in April & May and November – February. Expect highs of 63°F (17°C) and 3.3 in (83 mm) of rain. September is inside the Mar – May, Sep – Nov window our Buenos Aires, Mendoza & Iguazú route recommends.
How cold is Buenos Aires in September?
Average highs are 63°F (17°C) and average lows 53°F (12°C), making it the 4th-coldest month by daytime highs.
Does it rain a lot in Buenos Aires in September?
Some: about 3.3 in (83 mm) of rain falls across September on average, the 5th-driest month of the year. The annual total is about 43.5 in (1104 mm).
What should I pack for Buenos Aires in September?
Bring a warm layer for evenings (lows near 53°F), packable rain jacket or umbrella (a shower or two is likely) and comfortable walking shoes (most picks involve some walking).
More on Buenos Aires
Routes in season in September
- Buenos Aires, Mendoza & Iguazú Mar – May, Sep – Nov
Planning Buenos Aires in September?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.