September Weather in Grajau, Brazil

Last updated: August 22, 2025

In September, the average temperature in Grajau, Brazil reaches a warm 29°C (84°F). Expect lows around 20°C (68°F) and highs soaring to 39°C (102°F). This month brings an average precipitation of 9 mm (0.4 in) over 1 day, accompanied by a comfortable average humidity of 46%.

September Temperature in Grajau

In September in Grajau, the average temperature is 29°C (84°F). The maximum can reach 39°C (102°F), while the minimum can drop to 20°C (68°F). Travelers should be prepared for hot weather, making it ideal for beach activities and exploring outdoor attractions.

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

The chart illustrates September temperature patterns in Grajau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grajau, September typically has an average temperature of 29°C (84°F), with highs reaching up to 39°C (102°F) and lows dropping to around 20°C (68°F).

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

September Precipitation in Grajau

In Grajau in September, the precipitation amount is 9 mm (0.4 in) over the course of 1 day.

September Precipitation Trends in Grajau

The chart displays monthly precipitation patterns in Grajau, 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 Grajau, September typically receives around 9 mm (0.4 inches) of precipitation spread over approximately 1 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 Grajau

In Grajau in September humidity is 46%. With an average temperature of 29°C (84°F), this humidity feels like a warm embrace, making traveling slightly uncomfortable, as the air feels thick and sticky, potentially leading to sweat and fatigue during outdoor activities.

September Average Humidity in Grajau

This chart illustrates the average monthly humidity levels in Grajau, 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 Grajau is approximately 46%, 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 Grajau

In Grajau 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 Grajau.

Maximum UV Index Levels in Grajau for September

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

Data source: Grajau 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 Grajau Compares to Other Months

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

This table compares monthly weather conditions in Grajau, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (80°F)	122 mm (4.8 inches)	91%	extreme
February Weather	26°C (80°F)	214 mm (8.4 inches)	91%	extreme
March Weather	26°C (79°F)	193 mm (7.6 inches)	91%	extreme
April Weather	27°C (80°F)	146 mm (5.8 inches)	94%	extreme
May Weather	27°C (81°F)	45 mm (1.8 inches)	89%	extreme
June Weather	27°C (81°F)	4 mm (0.2 inches)	80%	extreme
July Weather	27°C (81°F)	3 mm (0.1 inches)	66%	extreme
August Weather	28°C (83°F)	2 mm (0.1 inches)	53%	extreme
September Weather	29°C (84°F)	9 mm (0.4 inches)	46%	extreme
October Weather	29°C (84°F)	36 mm (1.4 inches)	45%	extreme
November Weather	28°C (82°F)	88 mm (3.4 inches)	53%	extreme
December Weather	27°C (82°F)	124 mm (4.9 inches)	82%	extreme