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September Weather in Sao Jose, Brazil

Last updated: August 22, 2025

In September, the average temperature in Sao Jose, Brazil is a pleasant 18°C (65°F). Visitors can expect a range where the minimum dips to 6°C (42°F) and peaks at a warm 33°C (93°F). With 147 mm (5.8 in) of precipitation spread over 15 days, it's wise to prepare for some rain. The air tends to be quite humid, with an average humidity of 86%, making it feel even warmer.

September Temperature in Sao Jose

In September in Sao Jose, the average temperature is 18°C (65°F). The maximum can reach 33°C (93°F), while the minimum can be as low as 6°C (42°F). Be sure to pack for both warm days and cooler nights when traveling during this time.

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

The chart illustrates September temperature patterns in Sao Jose, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sao Jose, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (93°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec747371676260586064666872
Data source: Temperature data for Sao Jose 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 Jose

In Sao Jose in September, the precipitation amount is 147 mm (5.8 in) over a span of 15 days.

September Precipitation Trends in Sao Jose

The chart displays monthly precipitation patterns in Sao Jose, 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 Jose, September typically receives around 147 mm (5.8 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec273198192941331386266147136165231
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sao Jose

In Sao Jose in September humidity is 86%. With an average temperature of 18°C (65°F), this humidity feels like you’re wrapped in a warm, heavy blanket, making outdoor activities feel quite muggy and sticky for traveling.

September Average Humidity in Sao Jose

This chart illustrates the average monthly humidity levels in Sao Jose, 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 Jose is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%84%83%86%82%80%81%86%87%87%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sao Jose

In Sao Jose in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Sao Jose.

Maximum UV Index Levels in Sao Jose for September

The chart shows the monthly maximum UV Index (UVI) for Sao Jose 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 Jose typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec15141210755710121414
Data source: Sao Jose 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 Jose Compares to Other Months

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

This table compares monthly weather conditions in Sao Jose, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (74°F)273 mm (10.7 inches)85%extreme
February Weather23°C (73°F)198 mm (7.8 inches)84%extreme
March Weather22°C (71°F)192 mm (7.6 inches)84%extreme
April Weather19°C (67°F)94 mm (3.7 inches)83%very high
May Weather17°C (62°F)133 mm (5.2 inches)86%high
June Weather15°C (60°F)138 mm (5.4 inches)82%moderate
July Weather14°C (58°F)62 mm (2.4 inches)80%moderate
August Weather15°C (60°F)66 mm (2.6 inches)81%high
September Weather18°C (65°F)147 mm (5.8 inches)86%very high
October Weather19°C (66°F)136 mm (5.3 inches)87%extreme
November Weather20°C (68°F)165 mm (6.5 inches)87%extreme
December Weather22°C (72°F)231 mm (9.1 inches)88%extreme

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