September Weather in Rosario, Uruguay

Last updated: August 28, 2025

In September, the average temperature in Rosario, Uruguay hovers around 14°C (58°F). You can expect temperatures to range from a chilly 3°C (38°F) at night to a warm 29°C (85°F) during the day. Be prepared for 76 mm (3.0 in) of rainfall spread over 7 days and a relatively high humidity level of 76%. Stay comfortable as you explore this vibrant destination!

September Temperature in Rosario

In September in Rosario, the average temperature is 14°C (58°F). Maximum temperatures can reach 29°C (85°F), while minimum temperatures can drop to as low as 3°C (38°F). Be sure to pack layers to comfortably enjoy the varied weather conditions during your travels!

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

The chart illustrates September temperature patterns in Rosario, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rosario, September typically has an average temperature of 14°C (58°F), with highs reaching up to 29°C (85°F) and lows dropping to around 3°C (38°F).

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

September Precipitation in Rosario

In Rosario in September, the precipitation amount is 76 mm (3.0 in) over a period of 7 days.

September Precipitation Trends in Rosario

The chart displays monthly precipitation patterns in Rosario, 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 Rosario, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 7 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 Rosario

In Rosario in September humidity is 76%. With an average temperature of 14°C (58°F), this humidity feels like a warm, thick blanket wrapping around you, making outdoor activities feel sticky and draining, and prompting travelers to seek shade and stay hydrated often.

September Average Humidity in Rosario

This chart illustrates the average monthly humidity levels in Rosario, 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 Rosario is approximately 76%, 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 Rosario

In Rosario in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Rosario.

Maximum UV Index Levels in Rosario for September

The chart shows the monthly maximum UV Index (UVI) for Rosario 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 Rosario typically reaches 8, which falls under the very high exposure category.

Data source: Rosario 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 Rosario Compares to Other Months

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

This table compares monthly weather conditions in Rosario, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	24°C (76°F)	85 mm (3.4 inches)	63%	extreme
February Weather	23°C (73°F)	110 mm (4.3 inches)	69%	extreme
March Weather	21°C (70°F)	95 mm (3.7 inches)	73%	extreme
April Weather	18°C (65°F)	70 mm (2.8 inches)	79%	high
May Weather	14°C (58°F)	89 mm (3.5 inches)	82%	moderate
June Weather	12°C (54°F)	75 mm (3.0 inches)	80%	moderate
July Weather	11°C (52°F)	86 mm (3.4 inches)	72%	moderate
August Weather	12°C (54°F)	75 mm (3.0 inches)	72%	high
September Weather	14°C (58°F)	76 mm (3.0 inches)	76%	very high
October Weather	17°C (62°F)	91 mm (3.6 inches)	71%	very high
November Weather	20°C (69°F)	67 mm (2.6 inches)	68%	extreme
December Weather	23°C (73°F)	72 mm (2.8 inches)	65%	extreme