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September Weather in Treinta y Tres, Uruguay

Last updated: August 28, 2025

In Treinta y Tres, Uruguay, the average temperature in September is a pleasant 15°C (59°F). However, temperatures can vary significantly, with a minimum of 1°C (33°F) and a maximum soaring to 31°C (87°F). Expect around 123 mm (4.8 in) of precipitation spread over 10 days, and a relatively high average humidity of 82%, creating a lush and vibrant atmosphere.

September Temperature in Treinta y Tres

In September in Treinta y Tres, the average temperature is 15°C (59°F). Maximums can reach 31°C (87°F), while minimums can be as low as 1°C (33°F). Be prepared for a wide range of temperatures during your travels.

September Weather in Treinta y Tres: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Treinta y Tres, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Treinta y Tres, September typically has an average temperature of 15°C (59°F), with highs reaching up to 31°C (87°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec757370665855535559626871
Data source: Temperature data for Treinta y Tres 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 Treinta y Tres

In Treinta y Tres in September, the total precipitation amount is 123 mm (4.8 in) over the course of 10 days.

September Precipitation Trends in Treinta y Tres

The chart displays monthly precipitation patterns in Treinta y Tres, 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 Treinta y Tres, September typically receives around 123 mm (4.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec102108597977118831031231247058
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Treinta y Tres

In Treinta y Tres in September, humidity is 82%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and uncomfortable for travelers.

September Average Humidity in Treinta y Tres

This chart illustrates the average monthly humidity levels in Treinta y Tres, 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 Treinta y Tres 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 Treinta y Tres

In Treinta y Tres in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Treinta y Tres.

Maximum UV Index Levels in Treinta y Tres for September

The chart shows the monthly maximum UV Index (UVI) for Treinta y Tres 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 Treinta y Tres typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151312854468111314
Data source: Treinta y Tres 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 Treinta y Tres Compares to Other Months

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

This table compares monthly weather conditions in Treinta y Tres, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (75°F)102 mm (4.0 inches)71%extreme
February Weather23°C (73°F)108 mm (4.3 inches)74%extreme
March Weather21°C (70°F)59 mm (2.3 inches)76%extreme
April Weather19°C (66°F)79 mm (3.1 inches)81%very high
May Weather15°C (59°F)77 mm (3.0 inches)87%moderate
June Weather13°C (55°F)118 mm (4.6 inches)86%moderate
July Weather12°C (53°F)83 mm (3.3 inches)81%moderate
August Weather13°C (55°F)103 mm (4.1 inches)78%high
September Weather15°C (59°F)123 mm (4.8 inches)82%very high
October Weather17°C (62°F)124 mm (4.9 inches)82%extreme
November Weather20°C (68°F)69 mm (2.7 inches)79%extreme
December Weather22°C (72°F)58 mm (2.3 inches)77%extreme

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