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December Weather in Posadas, Argentina

Last updated: August 22, 2025

In Posadas, Argentina, the average temperature in December is a warm 26°C (79°F). However, temperatures can vary significantly, with a minimum of 13°C (56°F) and a maximum soaring to 38°C (100°F). During this month, expect around 82 mm (3.2 in) of precipitation spread over 8 days, leading to an average humidity level of 84%.

December Temperature in Posadas

In December in Posadas, the average temperature is 26°C (79°F). Maximums can reach 38°C (100°F) and minimums can be as low as 13°C (56°F). This variation means travelers should be prepared for both warm days and cooler nights.

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

The chart illustrates December temperature patterns in Posadas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Posadas, December typically has an average temperature of 26°C (79°F), with highs reaching up to 38°C (100°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec817977726563616469737679
Data source: Temperature data for Posadas 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 Posadas

In Posadas in December, the total precipitation amount reached 82 mm (3.2 in) over the course of 8 days.

December Precipitation Trends in Posadas

The chart displays monthly precipitation patterns in Posadas, 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 Posadas, December typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1569110612221194807210117514282
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Posadas

In Posadas in December, humidity is 84%. With an average temperature of 26°C (79°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel sticky and exhausting, yet the vibrant atmosphere and lush surroundings offer a refreshing allure that invites exploration.

December Average Humidity in Posadas

This chart illustrates the average monthly humidity levels in Posadas, 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 Posadas is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%71%74%82%82%73%67%49%54%58%69%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Posadas

In Posadas 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 Posadas, you can check here.

Maximum UV Index Levels in Posadas for December

The chart shows the monthly maximum UV Index (UVI) for Posadas 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 Posadas typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec15141310656710131414
Data source: Posadas 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 Posadas Compares to Other Months

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

This table compares monthly weather conditions in Posadas, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather27°C (81°F)156 mm (6.2 inches)77%extreme
February Weather26°C (79°F)91 mm (3.6 inches)71%extreme
March Weather25°C (77°F)106 mm (4.2 inches)74%extreme
April Weather22°C (72°F)122 mm (4.8 inches)82%very high
May Weather19°C (66°F)211 mm (8.3 inches)82%high
June Weather17°C (63°F)94 mm (3.7 inches)73%moderate
July Weather16°C (61°F)80 mm (3.1 inches)67%high
August Weather18°C (65°F)72 mm (2.8 inches)49%high
September Weather21°C (70°F)101 mm (4.0 inches)54%very high
October Weather23°C (73°F)175 mm (6.9 inches)58%extreme
November Weather24°C (76°F)142 mm (5.6 inches)69%extreme
December Weather26°C (79°F)82 mm (3.2 inches)84%extreme

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