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December Weather in Rosario, Uruguay

Last updated: August 28, 2025

In December, the average temperature in Rosario, Uruguay hovers around 23°C (73°F). Expect a noticeable range, with minimum temperatures dipping to 7°C (46°F) and maximums soaring to 37°C (99°F). This month typically brings 72 mm (2.8 in) of precipitation spread over 6 days, while the average humidity sits comfortably at 65%.

December Temperature in Rosario

In December in Rosario, the average temperature is 23°C (73°F). Maximum temperatures can reach 37°C (99°F), while minimums can drop as low as 7°C (46°F). This provides a diverse climate, making it essential for travelers to pack both light clothing for the heat and warmer layers for cooler evenings.

December Weather in Rosario: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Rosario, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rosario, December typically has an average temperature of 23°C (73°F), with highs reaching up to 37°C (99°F) and lows dropping to around 7°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec767370655754525458626873
Data source: Temperature data for Rosario 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.

December Precipitation in Rosario

In Rosario in December, the total precipitation amount is 72 mm (2.8 in) over the course of 6 days.

December Precipitation Trends in Rosario

The chart displays monthly precipitation patterns in Rosario, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Rosario, December typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec8511095719075867576916772
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rosario

In Rosario in December, humidity is 65%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace that can make outdoor adventures a bit more strenuous, requiring frequent breaks and hydration but also creating a lush, vibrant atmosphere perfect for exploration.

December Average Humidity in Rosario

This chart illustrates the average monthly humidity levels in Rosario, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Rosario is approximately 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec63%69%73%79%83%80%72%72%76%71%68%65%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rosario

In Rosario in December, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Rosario, you can check here.

Maximum UV Index Levels in Rosario for December

The chart shows the monthly maximum UV Index (UVI) for Rosario in December, 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 December, the maximum UV index in Rosario typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141311754468101314
Data source: Rosario December 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 December Weather in Rosario Compares to Other Months

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

This table compares monthly weather conditions in Rosario, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (76°F)85 mm (3.4 inches)63%extreme
February Weather23°C (73°F)110 mm (4.3 inches)69%extreme
March Weather21°C (70°F)95 mm (3.7 inches)73%extreme
April Weather18°C (65°F)70 mm (2.8 inches)79%high
May Weather14°C (58°F)89 mm (3.5 inches)82%moderate
June Weather12°C (54°F)75 mm (3.0 inches)80%moderate
July Weather11°C (52°F)86 mm (3.4 inches)72%moderate
August Weather12°C (54°F)75 mm (3.0 inches)72%high
September Weather14°C (58°F)76 mm (3.0 inches)76%very high
October Weather17°C (62°F)91 mm (3.6 inches)71%very high
November Weather20°C (69°F)67 mm (2.6 inches)68%extreme
December Weather23°C (73°F)72 mm (2.8 inches)65%extreme

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