September Weather in Osasco, Brazil

Last updated: August 22, 2025

In September, the average temperature in Osasco, Brazil is a comfortable 20°C (69°F). The weather can vary, with minimums dipping to 9°C (48°F) and maximums soaring to 35°C (95°F). Expect about 40 mm (1.6 in) of precipitation spread over 6 days, and enjoy an average humidity of 58% for a pleasant atmosphere.

September Temperature in Osasco

In September in Osasco, the average temperature is 20°C (69°F). Maximum temperatures can reach 35°C (95°F), while the minimum can drop to as low as 9°C (48°F). This makes Osasco a great destination for travelers who enjoy mild weather during the day but should be prepared for cooler nights.

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

The chart illustrates September temperature patterns in Osasco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Osasco, September typically has an average temperature of 20°C (69°F), with highs reaching up to 35°C (95°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Osasco

In Osasco in September, the precipitation amount is 40 mm (1.6 in) over the course of 6 days.

September Precipitation Trends in Osasco

The chart displays monthly precipitation patterns in Osasco, 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 Osasco, September typically receives around 40 mm (1.6 inches) of precipitation spread over approximately 6 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 Osasco

In Osasco in September humidity is 58%. With an average temperature of 20°C (69°F), this humidity feels like a refreshing balmy embrace, making it quite pleasant for traveling as long as you stay hydrated and take occasional breaks in the shade.

September Average Humidity in Osasco

This chart illustrates the average monthly humidity levels in Osasco, 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 Osasco is approximately 58%, 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 Osasco

In Osasco in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Osasco.

Maximum UV Index Levels in Osasco for September

The chart shows the monthly maximum UV Index (UVI) for Osasco 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 Osasco typically reaches 11, which falls under the extreme exposure category.

Data source: Osasco 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 Osasco Compares to Other Months

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

This table compares monthly weather conditions in Osasco, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	23°C (74°F)	177 mm (7.0 inches)	88%	extreme
February Weather	23°C (73°F)	158 mm (6.2 inches)	88%	extreme
March Weather	23°C (73°F)	135 mm (5.3 inches)	87%	extreme
April Weather	20°C (69°F)	55 mm (2.2 inches)	84%	extreme
May Weather	18°C (65°F)	48 mm (1.9 inches)	79%	very high
June Weather	18°C (64°F)	45 mm (1.8 inches)	77%	high
July Weather	17°C (62°F)	25 mm (1.0 inches)	72%	high
August Weather	17°C (63°F)	57 mm (2.2 inches)	65%	very high
September Weather	20°C (69°F)	40 mm (1.6 inches)	58%	extreme
October Weather	21°C (70°F)	118 mm (4.6 inches)	50%	extreme
November Weather	21°C (69°F)	116 mm (4.6 inches)	75%	extreme
December Weather	22°C (72°F)	143 mm (5.6 inches)	80%	extreme