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Buenos Aires in September: Weather, Average temperature and Climate

Take a look at past year’s weather for Buenos Aires in September and see if it is worth visiting.
Check flight prices to Buenos Aires on Avionero:
September

Weather in Buenos Aires in September 2025

Good Weather
Mild
☀️
Sunny
🌊
Cold water
Are you considering a trip to Buenos Aires in September? Well, the weather is usually on your side with an average maximum temperature of +64°F and about 11 sunny days. Just keep in mind that there may be some rain, with an average of 8 rainy days and 69 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flights in one click on Avionero.

Average weather

☀️
+64°F
Avg. max. temperature
+32°F
Min.
+88°F
Max.
69 mm
Total precipitation
72%
Avg. humidity
4 m/s
Avg. wind
11 ☀️
Sunny Days
9 ⛅️
Cloudy
8 🌦
Rainy
Our opinion: Buenos Aires has good weather in September.

Average temperature in Buenos Aires in September

Here are the expected maximum, average and minimum temperatures in Buenos Aires for September based on the historical data.
Last Year
Historical Data

The temperature in September is +63°F on average, with a range between a maximum of +73°F during the day and a minimum of +43°F at night.

The average maximum temperature goes down 18% by the end of the month, compared with the beginning of the month, from +66°F to +61°F.

Is Buenos Aires warm or cold in September?

Buenos Aires is typically mild in September.

Maximum temperatures go up compared to the previous month from +61°F to +64°F. The minimum temperature also goes up from +48°F to +52°F.

Pack a light jacket as it will be warm in the day and cool in the evenings.

Take a look at how September is compared to other months in Buenos Aires:

Water temperature in Buenos Aires in September

Water in Buenos Aires in September is Cold. It varies from +53°F to +60°F, with an average of +57°F. This is almost similar to the air temperature, which averages +64°F.

In September, water temperatures are average relative to the rest of the year:

The warmest water temperatures in Buenos Aires are reached in January, when the average sea temperature rises to +75°F. The coldest water temperatures are in July, with an average of +53°F.

Can you swim in Buenos Aires in September?

We would not recommend swimming in Buenos Aires in September, the water is very cold (+57°F on average). Consider swimming only if you are an experienced cold-water swimmer with proper gear.
🦭
Cold
Below +61°F
🏄‍♂️
Fresh
61°F - 70°F
🏊
Comfortable
70°F - 77°F
👙
Warm
77°F - 82°F
🔥
Very warm
+82°C and up
You will need a full-body wetsuit, cap, gloves, a warm change of clothes, and a hot drink ready for after your swim.

Climate in Buenos Aires in September

Buenos Aires weather looks like this, on average, in September and the surrounding months.
AugustSeptemberOctober
Avg. temperature
+61°F+64°F+70°F
Min. temperature
+30°F+32°F+36°F
Max. temperature
+90°F+88°F+95°F
Rainfall
58 mm69 mm102 mm
Wind
3 m/s4 m/s4 m/s
Avg. water temperature
+54°F+57°F+63°F
Humidity
74%72%71%
Air pressure
1018 HPa1017 HPa1015 HPa
Sunny days
121110
Cloudy days
1097
Rainy days
7810
Snowy days
000

September weather is still as good as in August. It’s getting warmer as September arrives. The average maximum temperature goes up from +61°F to +64°F during the day. Prepare for more rain. Average rainfall goes from 58 mm to 69 mm. It feels drier, as humidity decreases from 74% to 72%. Winds are stronger in comparison to August, going up from 3 m/s to 4 m/s on average. The days becoming less sunny, going from 12 sunny days in August to 11 in September.

October brings much the same weather, it remains good.

Wind

Wind speed in Buenos Aires in September based on historical data.
Last Year
Historical Data

The average wind speed is 4 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.

The average wind speed in Buenos Aires is gradually decreasing during September, going from 3 m/s to 2 m/s over the course of the month.

Rain

Amount of rainfall in mm during September in Buenos Aires based on historical data.
Last Year
Historical Data
A chance of rain on a typical day in September stands at 27%, leading to total precipitation of around 45 mm. The maximum amount of rainfall per day is around 17 mm, which is considered light rain. On average, there are about 8 rainy days during September, so prepare to bring an umbrella.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Buenos Aires wettest month is October, where a typical day has a 32% chance of precipitation and 102 mm of rainfall per day. June, on the other hand, is the driest month with a mere 23% chance of precipitation and 48 mm of rainfall per day.

How was the weather last September in Buenos Aires?

This is the weather in Buenos Aires in September 2023:
1 September
☀️
+65°F
2 September
🌧️
+62°F
3 September
🌧️
+53°F
4 September
☀️
+55°F
5 September
☀️
+52°F
6 September
☀️
+55°F
7 September
🌧️
+58°F
8 September
☀️
+64°F
9 September
☀️
+64°F
10 September
☀️
+66°F
11 September
☀️
+66°F
12 September
☀️
+61°F
13 September
☀️
+60°F
14 September
☀️
+64°F
15 September
☀️
+73°F
16 September
☀️
+74°F
17 September
☀️
+63°F
18 September
☀️
+61°F
19 September
☁️
+60°F
20 September
☁️
+61°F
21 September
🌫️
+65°F
22 September
☁️
+63°F
23 September
☁️
+61°F
24 September
☀️
+60°F
25 September
☀️
+60°F
26 September
☀️
+57°F
27 September
☀️
+63°F
28 September
☀️
+67°F
29 September
☀️
+66°F
30 September
☀️
+60°F
In September 2023 Buenos Aires had 22 sunny days, 4 cloudy days, and 3 rainy days. The average maximum temperature was +63°F, with an absolute maximum of +73°F and a minimum of +52°F. The average humidity was 76%, with a maximum of 100% and a minimum of 43%. The average wind speed was 4 m/s, with a maximum of 11 m/s and a minimum of 0 m/s.
Are you planning a trip in September?

Climate Change Over the Years

This is how Buenos Aires climate has changed over the last 43 years.

The climate in Buenos Aires in September has not changed that much over the last 43 years.

The average temperature was the lowest in 1983 (+67°F) and the highest in 2017 (+72°F). The driest year was 2008 with only 468 mm of rainfall, and the wettest year was 2014 with 1388 mm.

FAQ

Frequently asked questions about the weather in Buenos Aires in September:

Is September a good time to visit Buenos Aires?

September is a really good time to go to Buenos Aires. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Buenos Aires.

Can you sunbathe in Buenos Aires in September?

September has mild temperatures in Buenos Aires. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!

Can you swim in Buenos Aires in September?

Swimming in Buenos Aires in September is challenging and not recommended for inexperienced swimmers or without proper equipment and preparation.

Is Buenos Aires rainy in September?

Buenos Aires is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.

Is it sunny in Buenos Aires in September?

The amount of sunny days in Buenos Aires during September varies; prepare for a mix of clouds and sun.

Other cities in Argentina

Check out the weather for other cities in Argentina.

Monthly weather in Buenos Aires

Source of the data

For this page, we’ve looked at the typical weather in Buenos Aires, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.