September Weather in Posadas, Argentina

Last updated: August 22, 2025

In September, the average temperature in Posadas, Argentina reaches a pleasant 21°C (70°F). However, temperatures can fluctuate, with a minimum of 7°C (46°F) and occasionally soaring up to a maximum of 38°C (100°F). Expect about 101 mm (4.0 in) of precipitation spread over 9 days, contributing to an average humidity level of 54%.

September Temperature in Posadas

In September in Posadas, the average temperature is 21°C (70°F). Maximums can reach 38°C (100°F), while minimums can drop to as low as 7°C (46°F). This diverse temperature range makes Posadas a perfect destination for travelers seeking both warm and cool experiences.

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

The chart illustrates September temperature patterns in Posadas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Posadas, September typically has an average temperature of 21°C (70°F), with highs reaching up to 38°C (100°F) and lows dropping to around 7°C (46°F).

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

September Precipitation in Posadas

In Posadas in September, the total precipitation amount is 101 mm (4.0 in), occurring over a span of 9 days.

September Precipitation Trends in Posadas

The chart displays monthly precipitation patterns in Posadas, 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 Posadas, September typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Posadas

In Posadas in September humidity is 54%. With an average temperature of 21°C (70°F), this humidity feels like a refreshing embrace, making it pleasant for traveling as you can comfortably explore the area without feeling overly sticky or fatigued.

September Average Humidity in Posadas

This chart illustrates the average monthly humidity levels in Posadas, 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 Posadas is approximately 54%, 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 Posadas

In Posadas in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Posadas.

Maximum UV Index Levels in Posadas for September

The chart shows the monthly maximum UV Index (UVI) for Posadas 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 Posadas typically reaches 10, which falls under the very high exposure category.

Data source: Posadas 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 Posadas Compares to Other Months

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

This table compares monthly weather conditions in Posadas, 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 (81°F)	156 mm (6.2 inches)	77%	extreme
February Weather	26°C (79°F)	91 mm (3.6 inches)	71%	extreme
March Weather	25°C (77°F)	106 mm (4.2 inches)	74%	extreme
April Weather	22°C (72°F)	122 mm (4.8 inches)	82%	very high
May Weather	19°C (66°F)	211 mm (8.3 inches)	82%	high
June Weather	17°C (63°F)	94 mm (3.7 inches)	73%	moderate
July Weather	16°C (61°F)	80 mm (3.1 inches)	67%	high
August Weather	18°C (65°F)	72 mm (2.8 inches)	49%	high
September Weather	21°C (70°F)	101 mm (4.0 inches)	54%	very high
October Weather	23°C (73°F)	175 mm (6.9 inches)	58%	extreme
November Weather	24°C (76°F)	142 mm (5.6 inches)	69%	extreme
December Weather	26°C (79°F)	82 mm (3.2 inches)	84%	extreme