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September Weather in Arroio dos Ratos, Brazil

Last updated: August 22, 2025

In Arroio dos Ratos, Brazil, the average temperature in September is a pleasant 18°C (65°F), with a range that can dip to a minimum of 6°C (43°F) and soar to a maximum of 34°C (94°F). Expect some rain, as precipitation reaches 151 mm (6.0 in) over about 12 days of the month. Plus, with an average humidity of 84%, be prepared for a humid atmosphere during your stay!

September Temperature in Arroio dos Ratos

In September in Arroio dos Ratos, the average temperature is 18°C (65°F), with maximums reaching 34°C (94°F) and minimums dropping to as low as 6°C (43°F). This variety in temperatures makes it essential for travelers to pack layers to enjoy all that Arroio dos Ratos has to offer comfortably.

September Weather in Arroio dos Ratos: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Arroio dos Ratos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Arroio dos Ratos, September typically has an average temperature of 18°C (65°F), with highs reaching up to 34°C (94°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec787774706359576064687175
Data source: Temperature data for Arroio dos Ratos 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 Arroio dos Ratos

In Arroio dos Ratos in September, the total precipitation amount is 151 mm (6.0 in) accumulated over the course of 12 days.

September Precipitation Trends in Arroio dos Ratos

The chart displays monthly precipitation patterns in Arroio dos Ratos, 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 Arroio dos Ratos, September typically receives around 151 mm (6.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec8591102761601171237615113910864
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Arroio dos Ratos

In Arroio dos Ratos in September, humidity is 84%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket enveloping you, making travel feel heavy and slightly uncomfortable as the air clings to your skin and limits your breath.

September Average Humidity in Arroio dos Ratos

This chart illustrates the average monthly humidity levels in Arroio dos Ratos, 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 Arroio dos Ratos is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%79%79%82%87%85%82%81%84%85%82%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Arroio dos Ratos

In Arroio dos Ratos 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 Arroio dos Ratos.

Maximum UV Index Levels in Arroio dos Ratos for September

The chart shows the monthly maximum UV Index (UVI) for Arroio dos Ratos 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 Arroio dos Ratos typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141312964579121314
Data source: Arroio dos Ratos 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 Arroio dos Ratos Compares to Other Months

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

This table compares monthly weather conditions in Arroio dos Ratos, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (78°F)85 mm (3.3 inches)77%extreme
February Weather25°C (77°F)91 mm (3.6 inches)79%extreme
March Weather23°C (74°F)102 mm (4.0 inches)79%extreme
April Weather21°C (70°F)76 mm (3.0 inches)82%very high
May Weather17°C (63°F)160 mm (6.3 inches)87%high
June Weather15°C (60°F)117 mm (4.6 inches)85%moderate
July Weather14°C (57°F)123 mm (4.9 inches)82%moderate
August Weather15°C (60°F)76 mm (3.0 inches)81%high
September Weather18°C (65°F)151 mm (6.0 inches)84%very high
October Weather20°C (68°F)139 mm (5.5 inches)85%extreme
November Weather22°C (71°F)108 mm (4.3 inches)82%extreme
December Weather24°C (75°F)64 mm (2.5 inches)84%extreme

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