September Weather in Bastos, Brazil

Last updated: August 22, 2025

In September, the average temperature in Bastos, Brazil hovers around 26°C (79°F), making it a delightful time to explore. However, be prepared for temperature swings, with lows reaching 12°C (54°F) and highs climbing up to 41°C (106°F). Expect some light rain, with 30 mm (1.2 in) of precipitation spread over approximately 4 days. The average humidity is a comfortable 47%, adding to the pleasant atmosphere.

September Temperature in Bastos

In September in Bastos, the average temperature is 26°C (79°F). Maximum can reach 41°C (106°F), and minimum can be as low as 12°C (54°F). It's a great time for travelers to enjoy diverse outdoor activities, but be prepared for hot days and cooler nights.

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

The chart illustrates September temperature patterns in Bastos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bastos, September typically has an average temperature of 26°C (79°F), with highs reaching up to 41°C (106°F) and lows dropping to around 12°C (54°F).

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

September Precipitation in Bastos

In Bastos in September, the precipitation amount is 30 mm (1.2 in) over the course of 4 days.

September Precipitation Trends in Bastos

The chart displays monthly precipitation patterns in Bastos, 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 Bastos, September typically receives around 30 mm (1.2 inches) of precipitation spread over approximately 4 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 Bastos

In Bastos in September humidity is 47%. With an average temperature of 26°C (79°F), this humidity feels like a warm embrace, making it quite pleasant for traveling as you can comfortably explore outdoor attractions without excessive moisture weighing you down.

September Average Humidity in Bastos

This chart illustrates the average monthly humidity levels in Bastos, 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 Bastos is approximately 47%, 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 Bastos

In Bastos 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 Bastos.

Maximum UV Index Levels in Bastos for September

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

Data source: Bastos 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 Bastos Compares to Other Months

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

This table compares monthly weather conditions in Bastos, 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 (79°F)	149 mm (5.9 inches)	84%	extreme
February Weather	26°C (79°F)	144 mm (5.7 inches)	81%	extreme
March Weather	26°C (79°F)	86 mm (3.4 inches)	81%	extreme
April Weather	24°C (76°F)	45 mm (1.8 inches)	75%	extreme
May Weather	22°C (71°F)	41 mm (1.6 inches)	68%	very high
June Weather	21°C (70°F)	25 mm (1.0 inches)	64%	high
July Weather	21°C (70°F)	6 mm (0.2 inches)	58%	high
August Weather	22°C (71°F)	45 mm (1.8 inches)	49%	very high
September Weather	26°C (79°F)	30 mm (1.2 inches)	47%	extreme
October Weather	26°C (78°F)	105 mm (4.1 inches)	44%	extreme
November Weather	26°C (79°F)	102 mm (4.0 inches)	68%	extreme
December Weather	26°C (79°F)	141 mm (5.5 inches)	82%	extreme