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September Weather in Buenos Aires, Mexico

Last updated: August 27, 2025

In September, the average temperature in Buenos Aires, Mexico is a pleasant 21°C (70°F). You can expect a minimum of 16°C (61°F) and a comfortable maximum of 30°C (86°F). With only 6 mm (0.2 in) of precipitation spread across 0 days, you'll likely enjoy plenty of sunshine. The average humidity sits at a moderate 52%, making it an ideal time to explore and enjoy the outdoor beauty!

September Temperature in Buenos Aires

In September in Buenos Aires, the average temperature is 21°C (70°F), with maximums reaching 30°C (86°F) and minimums dropping to as low as 16°C (61°F). This moderate climate makes it an ideal destination for travelers looking to enjoy pleasant weather.

September Weather in Buenos Aires: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Buenos Aires, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Buenos Aires, September typically has an average temperature of 21°C (70°F), with highs reaching up to 30°C (86°F) and lows dropping to around 16°C (61°F).
JanFebMarAprMayJunJulAugSepOctNovDec575657606164697169676257
Data source: Temperature data for Buenos Aires generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Buenos Aires

In Buenos Aires in September, the total precipitation amount is 6 mm (0.2 in), spread over a duration of 0 days.

September Precipitation Trends in Buenos Aires

The chart displays monthly precipitation patterns in Buenos Aires, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Buenos Aires, September typically receives around 6 mm (0.2 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec60755727267556143568
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Buenos Aires

In Buenos Aires in September, humidity is 52%. With an average temperature of 21°C (70°F), this humidity feels like a refreshing embrace, making long strolls through the streets enjoyable, as the warmth is balanced by a gentle, breathable air that invites exploration.

September Average Humidity in Buenos Aires

This chart illustrates the average monthly humidity levels in Buenos Aires, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Buenos Aires is approximately 52%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%77%67%56%46%48%46%42%52%58%66%74%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Buenos Aires

In Buenos Aires in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Buenos Aires.

Maximum UV Index Levels in Buenos Aires for September

The chart shows the monthly maximum UV Index (UVI) for Buenos Aires in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Buenos Aires typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110754
Data source: Buenos Aires September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Buenos Aires Compares to Other Months

Weather in Buenos Aires varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Buenos Aires, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Buenos Aires, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather14°C (57°F)60 mm (2.3 inches)72%moderate
February Weather13°C (56°F)75 mm (3.0 inches)77%high
March Weather14°C (57°F)57 mm (2.2 inches)67%very high
April Weather15°C (60°F)27 mm (1.1 inches)56%very high
May Weather16°C (61°F)26 mm (1.0 inches)46%extreme
June Weather18°C (65°F)7 mm (0.3 inches)48%extreme
July Weather21°C (69°F)5 mm (0.2 inches)46%extreme
August Weather21°C (71°F)5 mm (0.2 inches)42%extreme
September Weather21°C (70°F)6 mm (0.2 inches)52%very high
October Weather19°C (67°F)14 mm (0.6 inches)58%high
November Weather17°C (62°F)35 mm (1.4 inches)66%moderate
December Weather14°C (58°F)68 mm (2.7 inches)74%moderate

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