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September Weather in Sao Joao, Brazil

Last updated: August 22, 2025

In September, the average temperature in Sao Joao, Brazil hovers around 21°C (71°F). Conditions can vary, with minimums dipping to 16°C (61°F) and maximums soaring up to 30°C (87°F). During this month, expect about 70 mm (2.7 in) of precipitation over 22 days, contributing to an average humidity of 79%.

September Temperature in Sao Joao

In September in Sao Joao, the average temperature is 21°C (71°F), with maximums reaching up to 30°C (87°F) and minimums dropping as low as 16°C (61°F). This mild climate makes it a perfect time for travelers to explore the sights and enjoy outdoor activities.

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

The chart illustrates September temperature patterns in Sao Joao, 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, September typically has an average temperature of 21°C (71°F), with highs reaching up to 30°C (87°F) and lows dropping to around 16°C (61°F).
JanFebMarAprMayJunJulAugSepOctNovDec757676747270696970737475
Data source: Temperature data for Sao Joao 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 Sao Joao

In Sao Joao in September, the total precipitation amount reaches 70 mm (2.7 in) spread over a duration of 22 days.

September Precipitation Trends in Sao Joao

The chart displays monthly precipitation patterns in Sao Joao, 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, September typically receives around 70 mm (2.7 inches) of precipitation spread over approximately 22 days.
JanFebMarAprMayJunJulAugSepOctNovDec465098911111031248370393739
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sao Joao

In Sao Joao in September humidity is 79%. With an average temperature of 21°C (71°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel laborious and exhausting. Travelers should be prepared to hydrate frequently and take breaks in shaded areas to fully enjoy their time exploring.

September Average Humidity in Sao Joao

This chart illustrates the average monthly humidity levels in Sao Joao, 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 is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%87%88%89%90%89%86%84%79%74%71%72%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sao Joao

In Sao Joao in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Sao Joao, you can check here.

Maximum UV Index Levels in Sao Joao for September

The chart shows the monthly maximum UV Index (UVI) for Sao Joao 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 typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151415141211111214141515
Data source: Sao Joao 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 Compares to Other Months

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

This table compares monthly weather conditions in Sao Joao, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (75°F)45 mm (1.8 inches)84%extreme
February Weather24°C (76°F)50 mm (2.0 inches)87%extreme
March Weather24°C (76°F)98 mm (3.8 inches)88%extreme
April Weather24°C (75°F)91 mm (3.6 inches)89%extreme
May Weather22°C (73°F)111 mm (4.4 inches)90%extreme
June Weather21°C (71°F)103 mm (4.1 inches)89%extreme
July Weather20°C (69°F)124 mm (4.9 inches)86%extreme
August Weather20°C (69°F)83 mm (3.3 inches)84%extreme
September Weather21°C (71°F)70 mm (2.7 inches)79%extreme
October Weather23°C (73°F)39 mm (1.5 inches)74%extreme
November Weather24°C (75°F)37 mm (1.5 inches)71%extreme
December Weather24°C (75°F)39 mm (1.5 inches)72%extreme

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