September Weather in Buenos Aires, Colombia

Last updated: August 23, 2025

In Buenos Aires, Colombia, the average temperature in September is a comfortable 18°C (65°F). Expect minimums of 13°C (55°F) and maximums reaching 25°C (77°F). During this month, you'll likely experience 188 mm (7.4 in) of precipitation spread over 29 days, contributing to an average humidity of 69%.

September Temperature in Buenos Aires

In September in Buenos Aires, the average temperature is 18°C (65°F). Maximums can reach 25°C (77°F), and minimums can be as low as 13°C (55°F). Overall, it's a pleasant time to visit with mild weather, ideal for outdoor activities and exploring the sights.

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 18°C (65°F), with highs reaching up to 25°C (77°F) and lows dropping to around 13°C (55°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 total precipitation amount is 188 mm (7.4 in) over the course of 29 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 188 mm (7.4 inches) of precipitation spread over approximately 29 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 69%. With an average temperature of 18°C (65°F), this humidity feels like a warm, damp blanket around you, making travel less comfortable and causing you to feel sticky and fatigued more quickly.

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 69%, 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 is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Buenos Aires, you can check here.

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 14, 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	18°C (65°F)	191 mm (7.5 inches)	74%	extreme
February Weather	19°C (66°F)	280 mm (11.0 inches)	71%	extreme
March Weather	19°C (66°F)	313 mm (12.3 inches)	78%	extreme
April Weather	19°C (66°F)	333 mm (13.1 inches)	81%	extreme
May Weather	19°C (66°F)	315 mm (12.4 inches)	88%	extreme
June Weather	18°C (66°F)	260 mm (10.2 inches)	85%	extreme
July Weather	18°C (66°F)	213 mm (8.4 inches)	75%	extreme
August Weather	18°C (66°F)	174 mm (6.8 inches)	64%	extreme
September Weather	18°C (65°F)	188 mm (7.4 inches)	69%	extreme
October Weather	18°C (65°F)	329 mm (13.0 inches)	80%	extreme
November Weather	18°C (65°F)	335 mm (13.2 inches)	85%	extreme
December Weather	18°C (65°F)	324 mm (12.8 inches)	82%	extreme