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September Weather in Rio Branco, Uruguay

Last updated: August 28, 2025

In September, the average temperature in Rio Branco, Uruguay hovers around 16°C (60°F), with a fascinating range from a chilly 1°C (34°F) to a warm 33°C (91°F). Expect 151 mm (5.9 in) of precipitation spread over 9 days, all while basking in an average humidity of 82%. Prepare for a month where variability meets charm!

September Temperature in Rio Branco

In September in Rio Branco, the average temperature is 16°C (60°F). Maximums can reach 33°C (91°F) and minimums can be as low as 1°C (34°F). Be prepared for a wide range of temperatures, making it essential to pack both light and warm clothing for your trip.

September Weather in Rio Branco: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rio Branco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Branco, September typically has an average temperature of 16°C (60°F), with highs reaching up to 33°C (91°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec767471676056545660646972
Data source: Temperature data for Rio Branco 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 Rio Branco

In Rio Branco in September, the total precipitation amount is 151 mm (5.9 in) distributed over 9 days.

September Precipitation Trends in Rio Branco

The chart displays monthly precipitation patterns in Rio Branco, 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 Rio Branco, September typically receives around 151 mm (5.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec130103717883100961171511357367
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rio Branco

In Rio Branco in September humidity is 82%. With an average temperature of 16°C (60°F), this humidity feels like walking through a warm, thick blanket that clings to your skin, making every step feel heavier and travel more exhausting.

September Average Humidity in Rio Branco

This chart illustrates the average monthly humidity levels in Rio Branco, 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 Rio Branco is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec71%74%76%82%87%86%81%78%82%82%79%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rio Branco

In Rio Branco 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 Rio Branco.

Maximum UV Index Levels in Rio Branco for September

The chart shows the monthly maximum UV Index (UVI) for Rio Branco 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 Rio Branco typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141312854469111314
Data source: Rio Branco 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 Rio Branco Compares to Other Months

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

This table compares monthly weather conditions in Rio Branco, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (76°F)130 mm (5.1 inches)71%extreme
February Weather23°C (74°F)103 mm (4.0 inches)74%extreme
March Weather22°C (71°F)71 mm (2.8 inches)76%extreme
April Weather20°C (67°F)78 mm (3.1 inches)81%very high
May Weather15°C (60°F)83 mm (3.3 inches)87%moderate
June Weather13°C (57°F)100 mm (3.9 inches)86%moderate
July Weather12°C (55°F)96 mm (3.8 inches)81%moderate
August Weather13°C (56°F)117 mm (4.6 inches)78%high
September Weather16°C (60°F)151 mm (5.9 inches)82%very high
October Weather18°C (64°F)135 mm (5.3 inches)82%extreme
November Weather20°C (69°F)73 mm (2.9 inches)79%extreme
December Weather22°C (73°F)67 mm (2.6 inches)77%extreme

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