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September Weather in Brazil, United States

Last updated: June 24, 2025

In Brazil, United States, the average temperature in September hovers around 21°C (71°F). Expect a range where the minimum dips to a cool 6°C (44°F) and the maximum can soar up to 33°C (92°F). During this month, anticipate approximately 68 mm (2.7 in) of precipitation spread over 6 days, with an average humidity of 69%.

September Temperature in Brazil

In September in Brazil, the average temperature is 21°C (71°F). Maximums can reach 33°C (92°F), while minimums can be as low as 6°C (44°F). Overall, it's a great time to travel to Brazil for pleasant weather and diverse temperature variations.

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

The chart illustrates September temperature patterns in Brazil, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brazil, September typically has an average temperature of 21°C (71°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec313444536574777470584237
Data source: Temperature data for Brazil generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Brazil

In Brazil in September, the precipitation amount is 68 mm (2.7 in) spread over the course of 6 days.

September Precipitation Trends in Brazil

The chart displays monthly precipitation patterns in Brazil, 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 Brazil, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec8698130105134115106108691129790
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Brazil

In Brazil in September humidity is 69%. With an average temperature of 21°C (71°F), this humidity feels like a warm embrace, creating a tropical atmosphere that can make outdoor activities feel slightly sticky, yet invigorating for travelers who are ready to embrace the local culture and explore.

September Average Humidity in Brazil

This chart illustrates the average monthly humidity levels in Brazil, 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 Brazil is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Brazil

In Brazil in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Brazil.

Maximum UV Index Levels in Brazil for September

The chart shows the monthly maximum UV Index (UVI) for Brazil 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 Brazil typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Brazil 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 Brazil Compares to Other Months

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

This table compares monthly weather conditions in Brazil, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)85 mm (3.4 inches)87%moderate
February Weather1°C (34°F)98 mm (3.9 inches)85%moderate
March Weather6°C (44°F)130 mm (5.1 inches)86%high
April Weather12°C (53°F)105 mm (4.1 inches)84%very high
May Weather18°C (66°F)134 mm (5.3 inches)79%very high
June Weather23°C (75°F)115 mm (4.5 inches)82%extreme
July Weather25°C (78°F)106 mm (4.2 inches)79%very high
August Weather24°C (75°F)108 mm (4.3 inches)70%very high
September Weather21°C (71°F)68 mm (2.7 inches)69%very high
October Weather15°C (58°F)112 mm (4.4 inches)76%high
November Weather6°C (42°F)97 mm (3.8 inches)88%moderate
December Weather3°C (37°F)90 mm (3.5 inches)87%moderate

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