September weather forecast and climate
Buenos Aires, Argentina

The Congress Square monument in Buenos Aires, Argentina in spring
The Congress Square monument in Buenos Aires, Argentina in spring
Humidity in September drops further to 70% and as such the temperatures get warmer rising to read between 10°C (50°F) and 19°C (66.2°F) as does the sea temperature that now reads 11°C (51.8°F).
Enjoy more sunshine hours than average 6 across the day and take advantage to walk in the sun as it is mildly warm and not so hot. Expect more outdoor activities to come to birth already, but don't be scared of the rain as it will not interfere with the warmth in the atmosphere. It might fall for approximately seven days only across the month hence collecting at an average of 78.7mm (3.1") and will keep going up in the next few weeks.

What is the temperature in September in Buenos Aires?

The average high-temperature, in September, in Buenos Aires, Argentina, is 19.6°C (67.3°F), while the average low-temperature is 10.6°C (51.1°F).

How many days does it rain in September in Buenos Aires?

In Buenos Aires, Argentina, during September, the rain falls for 7.9 days and regularly aggregates up to 75mm (3") of precipitation.

What is the sea water temperature in September in Buenos Aires?

In Buenos Aires, Argentina, in September, the average water temperature is 14.2°C (57.6°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.
Average temperature in September - Buenos Aires, Argentina
  • Average high temperature in September: 19.6°C

The warmest month (with the highest average high temperature) is January (30.4°C).
The month with the lowest average high temperature is July (16°C).

  • Average low temperature in September: 10.6°C

The month with the highest average low temperature is January (20.2°C).
The coldest month (with the lowest average low temperature) is July (7.7°C).

Average humidity in September - Buenos Aires, Argentina
  • Average humidity in September: 71%

Months with the highest relative humidity are June and July (79%).
The month with the lowest relative humidity is December (64%).

Average rainfall in September - Buenos Aires, Argentina
  • Average rainfall in September: 75mm

The wettest month (with the highest rainfall) is March (172.3mm).
The driest month (with the lowest rainfall) is June (54.8mm).

Average rainfall days in September - Buenos Aires, Argentina
  • Average rainfall days in September: 7.9 days

The month with the highest number of rainy days is March (10 days).
The month with the lowest number of rainy days is May (6.6 days).

Average sea temperature in September - Buenos Aires, Argentina
  • Average sea temperature in September: 14.2°C

The best month for swimming (with the highest average sea temperature) is January (25°C).
The coldest month (with the lowest average sea temperature) is July (11.9°C).

Average daylight in September / Average sunshine in September - Buenos Aires, Argentina
  • Average daylight in September: 11.9h

The month with the longest days is December (Average daylight: 14.4h).
The month with shortest days is June (Average daylight: 9.9h).

  • Average sunshine in September: 6h

The month with most sunshine is January (Average sunshine: 8.9h).
Months with least sunshine are June and July (Average sunshine: 4.8).

Average UV index in September - Buenos Aires, Argentina
  • Average UV index in September: 6

Months with the highest UV index are January and December (UV index 12).
Months with the lowest UV index are June and July (UV index 2).

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