Buenos Aires
Argentina
Long-term weather forecast
Long-term weather forecast

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 50°F (10°C) and 66.2°F (19°C) as does the sea temperature that now reads 51.8°F (11°C). 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 about seven days only across the month hence collecting at an average of 3.1" (78.7mm) and will keep going up in the next few weeks.
  • The 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).

  • The 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).

  • The 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%).

  • The 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).

  • The 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).

  • The 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).

  • The average daylight in September: 12h

Months with the longest days are January, November and December (Average daylight: 14h).
Months with shortest days are May, June and July (Average daylight: 10h).

  • The 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).

  • The 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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