September Weather in Sao Joao do Piaui, Brazil

Last updated: August 22, 2025

In Sao Joao do Piaui, Brazil, the average temperature in September reaches a warm 30°C (86°F), with a comfortable minimum of 20°C (69°F) and a sizzling maximum of 40°C (105°F). You'll enjoy zero precipitation over the month, keeping the days dry and sunny. Additionally, the average humidity is a pleasant 56%—perfect for outdoor activities!

September Temperature in Sao Joao do Piaui

In September in Sao Joao do Piaui, the average temperature is 30°C (86°F), with maximums reaching up to 40°C (105°F) and minimums dropping as low as 20°C (69°F). Be prepared for warm weather and consider bringing lightweight clothing for your travels.

September Weather in Sao Joao do Piaui: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Sao Joao do Piaui, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sao Joao do Piaui, September typically has an average temperature of 30°C (86°F), with highs reaching up to 40°C (105°F) and lows dropping to around 20°C (69°F).

Data source: Temperature data for Sao Joao do Piaui generated using information from the Copernicus Climate Change Service.

September Precipitation in Sao Joao do Piaui

In Sao Joao do Piaui in September, the precipitation amount is 0 mm (0.0 in) during 0 days.

September Precipitation Trends in Sao Joao do Piaui

The chart displays monthly precipitation patterns in Sao Joao do Piaui, 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 Sao Joao do Piaui, September typically receives around 0 mm (0.0 inches) of precipitation spread over approximately 0 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 Sao Joao do Piaui

In Sao Joao do Piaui in September humidity is 56%. With an average temperature of 30°C (86°F), this humidity feels like a warm blanket enveloping you, making traveling feel slightly stifling but still manageable, as long as you stay hydrated and take breaks in the shade.

September Average Humidity in Sao Joao do Piaui

This chart illustrates the average monthly humidity levels in Sao Joao do Piaui, 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 Sao Joao do Piaui is approximately 56%, 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 Sao Joao do Piaui

In Sao Joao do Piaui in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Sao Joao do Piaui.

Maximum UV Index Levels in Sao Joao do Piaui for September

The chart shows the monthly maximum UV Index (UVI) for Sao Joao do Piaui 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 Sao Joao do Piaui typically reaches 13, which falls under the extreme exposure category.

Data source: Sao Joao do Piaui 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 Sao Joao do Piaui Compares to Other Months

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

This table compares monthly weather conditions in Sao Joao do Piaui, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	28°C (83°F)	59 mm (2.3 inches)	86%	extreme
February Weather	27°C (81°F)	153 mm (6.0 inches)	90%	extreme
March Weather	27°C (81°F)	109 mm (4.3 inches)	92%	extreme
April Weather	27°C (82°F)	100 mm (3.9 inches)	90%	extreme
May Weather	28°C (83°F)	15 mm (0.6 inches)	84%	extreme
June Weather	28°C (82°F)	2 mm (0.1 inches)	76%	extreme
July Weather	27°C (82°F)	1 mm (0.0 inches)	68%	extreme
August Weather	29°C (84°F)	0 mm (0.0 inches)	62%	extreme
September Weather	30°C (86°F)	0 mm (0.0 inches)	56%	extreme
October Weather	31°C (88°F)	34 mm (1.3 inches)	51%	extreme
November Weather	29°C (85°F)	55 mm (2.2 inches)	44%	extreme
December Weather	28°C (83°F)	53 mm (2.1 inches)	59%	extreme