September Weather in Avellaneda, Argentina

Last updated: August 22, 2025

In September, the average temperature in Avellaneda, Argentina hovers around 18°C (65°F). Temperatures can fluctuate significantly, dipping to a chilly 5°C (41°F) and soaring up to a sweltering 39°C (102°F). Be prepared for some rain, as 117 mm (4.6 in) of precipitation can be expected over approximately 7 days. With an average humidity level of 55%, the weather remains comfortably moist throughout the month.

September Temperature in Avellaneda

In September in Avellaneda, the average temperature is 18°C (65°F), with maximums reaching up to 39°C (102°F) and minimums dropping as low as 5°C (41°F). Be prepared for a wide range of temperatures when traveling to Avellaneda during this time.

September Weather in Avellaneda: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Avellaneda, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Avellaneda, September typically has an average temperature of 18°C (65°F), with highs reaching up to 39°C (102°F) and lows dropping to around 5°C (41°F).

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

September Precipitation in Avellaneda

In Avellaneda in September, the precipitation amount is 117 mm (4.6 in) accumulated over a period of 7 days.

September Precipitation Trends in Avellaneda

The chart displays monthly precipitation patterns in Avellaneda, 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 Avellaneda, September typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 7 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 Avellaneda

In Avellaneda in September humidity is 55%. With an average temperature of 18°C (65°F), this humidity feels like a gentle embrace, creating a comfortable yet slightly sticky atmosphere that is perfect for leisurely strolls and outdoor adventures.

September Average Humidity in Avellaneda

This chart illustrates the average monthly humidity levels in Avellaneda, 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 Avellaneda is approximately 55%, 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 Avellaneda

In Avellaneda in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Avellaneda.

Maximum UV Index Levels in Avellaneda for September

The chart shows the monthly maximum UV Index (UVI) for Avellaneda 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 Avellaneda typically reaches 9, which falls under the very high exposure category.

Data source: Avellaneda 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 Avellaneda Compares to Other Months

Weather in Avellaneda varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Avellaneda, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Avellaneda, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (80°F)	155 mm (6.1 inches)	66%	extreme
February Weather	26°C (78°F)	78 mm (3.1 inches)	61%	extreme
March Weather	24°C (75°F)	88 mm (3.5 inches)	71%	extreme
April Weather	21°C (70°F)	93 mm (3.7 inches)	81%	very high
May Weather	17°C (63°F)	113 mm (4.4 inches)	84%	high
June Weather	14°C (58°F)	66 mm (2.6 inches)	76%	moderate
July Weather	14°C (57°F)	38 mm (1.5 inches)	64%	moderate
August Weather	16°C (61°F)	52 mm (2.0 inches)	46%	high
September Weather	18°C (65°F)	117 mm (4.6 inches)	55%	very high
October Weather	21°C (70°F)	92 mm (3.6 inches)	57%	extreme
November Weather	24°C (75°F)	157 mm (6.2 inches)	59%	extreme
December Weather	25°C (78°F)	97 mm (3.8 inches)	75%	extreme