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September Weather in Sao Joao da Boa Vista, Brazil

Last updated: August 22, 2025

In September, the average temperature in Sao Joao da Boa Vista, Brazil is a pleasant 23°C (73°F). However, don’t be caught off guard; temperatures can dip as low as 9°C (48°F) or soar to a sizzling 36°C (97°F). Expect some rain, with an average precipitation amount of 39 mm (1.5 in) spread over 4 days, and enjoy a comfortable average humidity of 58%.

September Temperature in Sao Joao da Boa Vista

In September in Sao Joao da Boa Vista, the average temperature is 23°C (73°F). Maximums can reach 36°C (97°F), while minimums can drop as low as 9°C (48°F). This diverse temperature range makes it essential for travelers to pack both light and warm clothing to enjoy their visit comfortably.

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

The chart illustrates September temperature patterns in Sao Joao da Boa Vista, 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 da Boa Vista, September typically has an average temperature of 23°C (73°F), with highs reaching up to 36°C (97°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec747373706564636673737273
Data source: Temperature data for Sao Joao da Boa Vista 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 da Boa Vista

In Sao Joao da Boa Vista in September, the precipitation amount is 39 mm (1.5 in) spread over a period of 4 days.

September Precipitation Trends in Sao Joao da Boa Vista

The chart displays monthly precipitation patterns in Sao Joao da Boa Vista, 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 da Boa Vista, September typically receives around 39 mm (1.5 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec214186146604617103139130159192
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sao Joao da Boa Vista

In Sao Joao da Boa Vista in September, humidity is 58%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, creating a gentle stickiness that makes you appreciate the shade while exploring the vibrant streets.

September Average Humidity in Sao Joao da Boa Vista

This chart illustrates the average monthly humidity levels in Sao Joao da Boa Vista, 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 da Boa Vista is approximately 58%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%84%79%77%72%65%58%50%75%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sao Joao da Boa Vista

In Sao Joao da Boa Vista in September, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Sao Joao da Boa Vista.

Maximum UV Index Levels in Sao Joao da Boa Vista for September

The chart shows the monthly maximum UV Index (UVI) for Sao Joao da Boa Vista 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 da Boa Vista typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec161613118781012141516
Data source: Sao Joao da Boa Vista 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 da Boa Vista Compares to Other Months

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

This table compares monthly weather conditions in Sao Joao da Boa Vista, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (74°F)214 mm (8.4 inches)88%extreme
February Weather23°C (74°F)186 mm (7.3 inches)88%extreme
March Weather23°C (74°F)146 mm (5.7 inches)87%extreme
April Weather21°C (70°F)59 mm (2.3 inches)84%extreme
May Weather18°C (65°F)46 mm (1.8 inches)79%very high
June Weather18°C (65°F)17 mm (0.7 inches)77%high
July Weather17°C (63°F)10 mm (0.4 inches)72%very high
August Weather19°C (66°F)31 mm (1.2 inches)65%very high
September Weather23°C (73°F)39 mm (1.5 inches)58%extreme
October Weather23°C (74°F)130 mm (5.1 inches)50%extreme
November Weather22°C (73°F)159 mm (6.3 inches)75%extreme
December Weather23°C (74°F)192 mm (7.6 inches)80%extreme

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