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September Weather in Montevideo, United States

Last updated: June 24, 2025

In Montevideo, United States, the average temperature in September is a pleasant 18°C (64°F). However, temperatures can vary significantly, with a minimum of 1°C (34°F) and a maximum soaring to 33°C (93°F). During this month, you can expect approximately 95 mm (3.8 in) of precipitation, spread over about 10 days, resulting in an average humidity of 82%.

September Temperature in Montevideo

In September in Montevideo, the average temperature is 18°C (64°F). Maximum temperatures can reach 33°C (93°F), while the minimum can drop as low as 1°C (34°F). Visitors should be prepared for a wide range of temperatures, making layering essential for an enjoyable trip.

September Weather in Montevideo: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Montevideo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Montevideo, September typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (93°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec151532425972747064483323
Data source: Temperature data for Montevideo 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 Montevideo

In Montevideo in September, the precipitation amount is 95 mm (3.8 in) over the course of 10 days.

September Precipitation Trends in Montevideo

The chart displays monthly precipitation patterns in Montevideo, 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 Montevideo, September typically receives around 95 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec202053691018210213395892638
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Montevideo

In Montevideo in September humidity is 82%. With an average temperature of 18°C (64°F), this humidity feels like a warm, muggy embrace that can make exploring the area feel stifling, leaving travelers drenched in sweat and longing for respite in the shade.

September Average Humidity in Montevideo

This chart illustrates the average monthly humidity levels in Montevideo, 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 Montevideo is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%89%81%82%76%81%82%83%82%82%87%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Montevideo

In Montevideo in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Montevideo.

Maximum UV Index Levels in Montevideo for September

The chart shows the monthly maximum UV Index (UVI) for Montevideo 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 Montevideo typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3557910997532
Data source: Montevideo 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 Montevideo Compares to Other Months

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

This table compares monthly weather conditions in Montevideo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (15°F)20 mm (0.8 inches)85%moderate
February Weather-9°C (15°F)20 mm (0.8 inches)89%moderate
March Weather0°C (32°F)53 mm (2.1 inches)81%moderate
April Weather6°C (43°F)69 mm (2.7 inches)82%high
May Weather15°C (59°F)101 mm (4.0 inches)76%very high
June Weather22°C (72°F)82 mm (3.2 inches)81%very high
July Weather23°C (74°F)102 mm (4.0 inches)82%very high
August Weather21°C (71°F)133 mm (5.2 inches)83%very high
September Weather18°C (64°F)95 mm (3.8 inches)82%high
October Weather9°C (48°F)89 mm (3.5 inches)82%moderate
November Weather1°C (34°F)26 mm (1.0 inches)87%moderate
December Weather-5°C (24°F)38 mm (1.5 inches)84%low

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