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September Weather in Portao, Brazil

Last updated: August 22, 2025

In Portao, Brazil, the average temperature in September hovers around 18°C (65°F), with minimums dipping to 5°C (41°F) and maximums soaring up to 36°C (97°F). Expect a fair share of rain, with 173 mm (6.8 in) of precipitation spread over 12 days. The air is quite humid, boasting an average humidity of 80%—perfect for those who love a tropical feel!

September Temperature in Portao

In September in Portao, the average temperature is 18°C (65°F). Maximums can reach 36°C (97°F), and minimums can drop as low as 5°C (41°F). It's advisable to pack for both warm and cooler conditions while exploring this destination.

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

The chart illustrates September temperature patterns in Portao, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portao, September typically has an average temperature of 18°C (65°F), with highs reaching up to 36°C (97°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec777673696360586065687074
Data source: Temperature data for Portao 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 Portao

In Portao in September, the precipitation amount is 173 mm (6.8 in) spread over the course of 12 days.

September Precipitation Trends in Portao

The chart displays monthly precipitation patterns in Portao, 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 Portao, September typically receives around 173 mm (6.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec123116115801601231287817315812991
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Portao

In Portao in September, humidity is 80%. With an average temperature of 18°C (65°F), this humidity feels like wandering through a warm, damp blanket, making every step slightly heavy and resulting in a constant sheen of sweat, which can be both refreshing and exhausting for travelers.

September Average Humidity in Portao

This chart illustrates the average monthly humidity levels in Portao, 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 Portao is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%77%79%83%88%86%82%77%80%84%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Portao

In Portao in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Portao.

Maximum UV Index Levels in Portao for September

The chart shows the monthly maximum UV Index (UVI) for Portao 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 Portao typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1413121065579121314
Data source: Portao 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 Portao Compares to Other Months

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

This table compares monthly weather conditions in Portao, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (78°F)123 mm (4.8 inches)80%extreme
February Weather24°C (76°F)116 mm (4.6 inches)77%extreme
March Weather23°C (73°F)115 mm (4.5 inches)79%extreme
April Weather21°C (69°F)79 mm (3.1 inches)83%very high
May Weather17°C (63°F)160 mm (6.3 inches)88%high
June Weather15°C (60°F)123 mm (4.8 inches)86%moderate
July Weather14°C (58°F)128 mm (5.0 inches)82%moderate
August Weather16°C (60°F)78 mm (3.1 inches)77%high
September Weather18°C (65°F)173 mm (6.8 inches)80%very high
October Weather20°C (68°F)158 mm (6.2 inches)84%extreme
November Weather21°C (71°F)129 mm (5.1 inches)83%extreme
December Weather24°C (75°F)91 mm (3.6 inches)87%extreme

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