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September Weather in Buenos Aires, Peru

Last updated: August 27, 2025

In Buenos Aires, Peru, the average temperature in September hovers around 16°C (61°F). Expect a minimum of 13°C (56°F) and a maximum of 19°C (66°F). During this period, you'll encounter approximately 24 mm (1.0 in) of precipitation spread over 7 days, contributing to an average humidity of 62%.

September Temperature in Buenos Aires

In September in Buenos Aires, the average temperature is 16°C (61°F). The maximum can reach 19°C (66°F) and the minimum can be as low as 13°C (56°F). This makes it a comfortable time to explore the outdoors and enjoy various activities without extreme weather conditions.

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 16°C (61°F), with highs reaching up to 19°C (66°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec697272686564626161616366
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 24 mm (1.0 in) over a period of 7 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 24 mm (1.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec171628161315191924221422
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 62%. With an average temperature of 16°C (61°F), this humidity feels like a gentle blanket, making traveling comfortable yet occasionally sticky, prompting the need for light, breathable clothing to fully enjoy the sights.

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 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%90%89%84%73%55%53%62%82%89%91%
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.
JanFebMarAprMayJunJulAugSepOctNovDec141415141210101113131313
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 Weather21°C (69°F)17 mm (0.7 inches)91%extreme
February Weather22°C (72°F)16 mm (0.6 inches)89%extreme
March Weather22°C (72°F)28 mm (1.1 inches)89%extreme
April Weather20°C (68°F)16 mm (0.6 inches)88%extreme
May Weather18°C (65°F)13 mm (0.5 inches)84%extreme
June Weather18°C (64°F)15 mm (0.6 inches)73%very high
July Weather17°C (63°F)19 mm (0.8 inches)55%very high
August Weather16°C (61°F)19 mm (0.8 inches)53%extreme
September Weather16°C (61°F)24 mm (1.0 inches)62%extreme
October Weather16°C (61°F)22 mm (0.9 inches)82%extreme
November Weather17°C (63°F)13 mm (0.5 inches)89%extreme
December Weather19°C (66°F)22 mm (0.9 inches)91%extreme

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