September Weather in Arroio Grande, Brazil

Last updated: August 22, 2025

In September, the average temperature in Arroio Grande, Brazil is a mild 16°C (61°F). However, be prepared for a range, as temperatures can dip to a cool 4°C (40°F) or rise to a warm 30°C (86°F). This month brings about 153 mm (6.0 in) of precipitation, typically spread over 11 days, and you'll experience an average humidity of 82%. Enjoy the season while staying prepared!

September Temperature in Arroio Grande

In September in Arroio Grande, the average temperature is 16°C (61°F). Maximums can reach up to 30°C (86°F), while minimums can drop as low as 4°C (40°F). It's a great time to visit for those who enjoy mild weather and the possibility of warm days.

September Weather in Arroio Grande: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Arroio Grande, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Arroio Grande, September typically has an average temperature of 16°C (61°F), with highs reaching up to 30°C (86°F) and lows dropping to around 4°C (40°F).

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

September Precipitation in Arroio Grande

In Arroio Grande in September, the total precipitation amount is 153 mm (6.0 in) over the course of 11 days.

September Precipitation Trends in Arroio Grande

The chart displays monthly precipitation patterns in Arroio Grande, 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 Arroio Grande, September typically receives around 153 mm (6.0 inches) of precipitation spread over approximately 11 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 Arroio Grande

In Arroio Grande in September humidity is 82%. With an average temperature of 16°C (61°F), this humidity feels like a heavy blanket enveloping you, making travel feel a bit sluggish and requiring frequent breaks to hydrate and cool down.

September Average Humidity in Arroio Grande

This chart illustrates the average monthly humidity levels in Arroio Grande, 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 Arroio Grande is approximately 82%, 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 Arroio Grande

In Arroio Grande 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 Arroio Grande.

Maximum UV Index Levels in Arroio Grande for September

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

Data source: Arroio Grande 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 Arroio Grande Compares to Other Months

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

This table compares monthly weather conditions in Arroio Grande, 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)	135 mm (5.3 inches)	71%	extreme
February Weather	23°C (74°F)	98 mm (3.9 inches)	74%	extreme
March Weather	22°C (72°F)	74 mm (2.9 inches)	76%	extreme
April Weather	20°C (68°F)	79 mm (3.1 inches)	81%	very high
May Weather	16°C (61°F)	88 mm (3.5 inches)	87%	moderate
June Weather	14°C (57°F)	101 mm (4.0 inches)	86%	moderate
July Weather	13°C (55°F)	112 mm (4.4 inches)	81%	moderate
August Weather	14°C (57°F)	119 mm (4.7 inches)	78%	high
September Weather	16°C (61°F)	153 mm (6.0 inches)	82%	very high
October Weather	18°C (64°F)	135 mm (5.3 inches)	82%	extreme
November Weather	20°C (69°F)	80 mm (3.1 inches)	79%	extreme
December Weather	22°C (72°F)	72 mm (2.9 inches)	77%	extreme