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September Weather in Buenos Aires, Peru

Last updated: August 27, 2025

In September, the average temperature in Buenos Aires, Peru is a pleasant 20°C (69°F). Temperatures can range from a cool 14°C (57°F) to a warm 29°C (85°F). Expect light precipitation, with around 6 mm (0.2 in) falling over just 1 day of the month, while average humidity hovers around 75%.

September Temperature in Buenos Aires

In September in Buenos Aires, the average temperature is 20°C (69°F). Maximums can reach 29°C (85°F) and minimums can be as low as 14°C (57°F). This pleasant climate makes Buenos Aires an ideal travel destination for enjoying outdoor activities and exploring the local attractions.

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 20°C (69°F), with highs reaching up to 29°C (85°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec767776757370686868707073
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 6 mm (0.2 in) over the course of 1 day.

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 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec952334241515011986343987
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 75%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel a bit muggy and requiring frequent hydration breaks to stay comfortable while exploring.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%87%87%86%89%84%71%71%75%77%79%86%
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 an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. 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 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151517161412121215151414
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 Weather24°C (76°F)95 mm (3.7 inches)89%extreme
February Weather25°C (77°F)233 mm (9.2 inches)87%extreme
March Weather25°C (77°F)424 mm (16.7 inches)87%extreme
April Weather24°C (76°F)151 mm (5.9 inches)86%extreme
May Weather23°C (74°F)50 mm (2.0 inches)89%extreme
June Weather21°C (71°F)11 mm (0.4 inches)84%extreme
July Weather20°C (69°F)8 mm (0.3 inches)71%extreme
August Weather20°C (68°F)8 mm (0.3 inches)71%extreme
September Weather20°C (69°F)6 mm (0.2 inches)75%extreme
October Weather21°C (70°F)34 mm (1.3 inches)77%extreme
November Weather21°C (71°F)39 mm (1.5 inches)79%extreme
December Weather23°C (73°F)87 mm (3.4 inches)86%extreme

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