September Weather in Buenos Aires, Mexico

Last updated: August 27, 2025

In September, the average temperature in Buenos Aires, Mexico reaches a warm 27°C (81°F). Daily highs can soar to a maximum of 34°C (94°F), while nights may cool down to a comfortable 22°C (71°F). It's worth noting that this month experiences significant precipitation, averaging 322 mm (12.7 in) over approximately 26 days, contributing to an average humidity of 86%.

September Temperature in Buenos Aires

In September in Buenos Aires, the average temperature is 27°C (81°F). Maximum temperatures can reach 34°C (94°F), while minimums can drop to as low as 22°C (71°F). This pleasant climate makes Buenos Aires an ideal destination for travelers seeking warm and comfortable 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 27°C (81°F), with highs reaching up to 34°C (94°F) and lows dropping to around 22°C (71°F).

Data source: Temperature data for Buenos Aires generated using information from the Copernicus Climate Change Service.

September Precipitation in Buenos Aires

In Buenos Aires in September, the precipitation amount reaches 322 mm (12.7 in) over the course of 26 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 322 mm (12.7 inches) of precipitation spread over approximately 26 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Buenos Aires

In Buenos Aires in September, humidity is 86%. With an average temperature of 27°C (81°F), this humidity feels like walking through a steamy blanket, making traveling feel heavy and exhausting as each step absorbs the warm, moist air.

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 86%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	22°C (71°F)	115 mm (4.5 inches)	88%	very high
February Weather	23°C (73°F)	89 mm (3.5 inches)	86%	extreme
March Weather	24°C (76°F)	58 mm (2.3 inches)	84%	extreme
April Weather	26°C (80°F)	48 mm (1.9 inches)	81%	extreme
May Weather	28°C (83°F)	69 mm (2.7 inches)	82%	extreme
June Weather	27°C (82°F)	285 mm (11.2 inches)	81%	extreme
July Weather	27°C (81°F)	226 mm (8.9 inches)	81%	extreme
August Weather	27°C (81°F)	250 mm (9.8 inches)	82%	extreme
September Weather	27°C (81°F)	322 mm (12.7 inches)	86%	extreme
October Weather	26°C (79°F)	358 mm (14.1 inches)	90%	extreme
November Weather	24°C (75°F)	222 mm (8.7 inches)	91%	very high
December Weather	22°C (72°F)	109 mm (4.3 inches)	91%	very high