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September Weather in Buenos Aires, Mexico

Last updated: August 27, 2025

In September, the average temperature in Buenos Aires, Mexico hovers around 27°C (81°F), with daytime highs reaching up to 32°C (90°F) and a mild minimum of 24°C (75°F). Expect a significant amount of rainfall, with averages of 319 mm (12.5 in) spread across 22 days, resulting in an average humidity level of 78%. Be prepared for a mix of warmth and moisture as you enjoy the climate!

September Temperature in Buenos Aires

In September in Buenos Aires, the average temperature is 27°C (81°F), with maximums reaching up to 32°C (90°F) and minimums dropping as low as 24°C (75°F). This warm weather makes it an ideal time for outdoor activities and exploring what Buenos Aires has to offer.

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 27°C (81°F), with highs reaching up to 32°C (90°F) and lows dropping to around 24°C (75°F).
JanFebMarAprMayJunJulAugSepOctNovDec777777777981828181808078
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 precipitation amount is 319 mm (12.5 in) distributed over 22 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 319 mm (12.5 inches) of precipitation spread over approximately 22 days.
JanFebMarAprMayJunJulAugSepOctNovDec54218213143312319266567
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 78%. With an average temperature of 27°C (81°F), this humidity feels like a warm, heavy embrace that makes traveling feel both invigorating and exhausting. Moments spent outside can quickly become clammy and uncomfortable, urging travelers to seek shade and hydration as they explore.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec66%64%63%69%73%76%78%79%78%75%72%70%
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 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For 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 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec911131313141312131198
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 Weather25°C (78°F)5 mm (0.2 inches)66%very high
February Weather25°C (77°F)4 mm (0.2 inches)64%extreme
March Weather25°C (78°F)2 mm (0.1 inches)63%extreme
April Weather25°C (78°F)1 mm (0.1 inches)69%extreme
May Weather26°C (80°F)8 mm (0.3 inches)73%extreme
June Weather27°C (81°F)213 mm (8.4 inches)76%extreme
July Weather28°C (82°F)143 mm (5.6 inches)78%extreme
August Weather27°C (81°F)312 mm (12.3 inches)79%extreme
September Weather27°C (81°F)319 mm (12.5 inches)78%extreme
October Weather27°C (81°F)266 mm (10.5 inches)75%extreme
November Weather26°C (80°F)56 mm (2.2 inches)72%very high
December Weather26°C (78°F)7 mm (0.3 inches)70%very high

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