September Weather in Merlo, Argentina

Last updated: August 22, 2025

In September, the average temperature in Merlo, Argentina hovers around 13°C (56°F). However, temperatures can vary significantly, ranging from a chilly -3°C (28°F) to a toasty 32°C (91°F). Expect about 29 mm (1.1 in) of precipitation over 4 days, and enjoy a relatively comfortable average humidity of 45%.

September Temperature in Merlo

In September in Merlo, the average temperature is 13°C (56°F). The maximum can reach 32°C (91°F), while the minimum can drop as low as -3°C (28°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack both warm and cool weather clothing.

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

The chart illustrates September temperature patterns in Merlo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merlo, September typically has an average temperature of 13°C (56°F), with highs reaching up to 32°C (91°F) and lows dropping to around -3°C (28°F).

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

September Precipitation in Merlo

In Merlo in September, the precipitation amount is 29 mm (1.1 in) over a span of 4 days.

September Precipitation Trends in Merlo

The chart displays monthly precipitation patterns in Merlo, 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 Merlo, September typically receives around 29 mm (1.1 inches) of precipitation spread over approximately 4 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 Merlo

In Merlo in September humidity is 45%. With an average temperature of 13°C (56°F), this humidity feels like a crisp chill, making it ideal for light layering while exploring the sights without feeling overheated.

September Average Humidity in Merlo

This chart illustrates the average monthly humidity levels in Merlo, 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 Merlo is approximately 45%, 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 Merlo

In Merlo 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 Merlo.

Maximum UV Index Levels in Merlo for September

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

Data source: Merlo 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 Merlo Compares to Other Months

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

This table compares monthly weather conditions in Merlo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	21°C (71°F)	113 mm (4.4 inches)	40%	extreme
February Weather	20°C (67°F)	122 mm (4.8 inches)	48%	extreme
March Weather	18°C (64°F)	91 mm (3.6 inches)	53%	extreme
April Weather	15°C (60°F)	68 mm (2.7 inches)	63%	very high
May Weather	11°C (53°F)	23 mm (0.9 inches)	67%	high
June Weather	8°C (46°F)	14 mm (0.5 inches)	61%	moderate
July Weather	7°C (46°F)	10 mm (0.4 inches)	55%	moderate
August Weather	10°C (51°F)	5 mm (0.2 inches)	48%	high
September Weather	13°C (56°F)	29 mm (1.1 inches)	45%	very high
October Weather	16°C (60°F)	46 mm (1.8 inches)	43%	extreme
November Weather	18°C (65°F)	121 mm (4.8 inches)	45%	extreme
December Weather	21°C (69°F)	89 mm (3.5 inches)	40%	extreme