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December Weather in San Martin, Argentina

Last updated: August 22, 2025

In San Martin, Argentina, the average temperature in December hovers around 25°C (77°F). However, be prepared for a range that can dip to a minimum of 10°C (50°F) and soar to a maximum of 42°C (108°F). Expect an average precipitation of 18 mm (0.7 in) spread over 3 days, accompanied by a comfortable average humidity of 37%.

December Temperature in San Martin

In December in San Martin, the average temperature is 25°C (77°F) with maximums reaching up to 42°C (108°F) and minimums dropping as low as 10°C (50°F). Be prepared for a wide range of temperatures while traveling, and pack accordingly to ensure a comfortable experience.

December Weather in San Martin: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in San Martin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Martin, December typically has an average temperature of 25°C (77°F), with highs reaching up to 42°C (108°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec807772655649485460667377
Data source: Temperature data for San Martin 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 San Martin

In San Martin in December, the precipitation amount is 18 mm (0.7 in) over a span of 3 days.

December Precipitation Trends in San Martin

The chart displays monthly precipitation patterns in San Martin, 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 San Martin, December typically receives around 18 mm (0.7 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec191717151168312131418
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Martin

In San Martin in December humidity is 37%. With an average temperature of 25°C (77°F), this humidity feels like a pleasant breeze on your skin, making it perfect for exploring the sights without the discomfort of excessive heat or stickiness.

December Average Humidity in San Martin

This chart illustrates the average monthly humidity levels in San Martin, 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 San Martin is approximately 37%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec44%49%56%67%66%58%59%52%45%43%41%37%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Martin

In San Martin in December, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in San Martin.

Maximum UV Index Levels in San Martin for December

The chart shows the monthly maximum UV Index (UVI) for San Martin 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 San Martin typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151412964579121415
Data source: San Martin 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 San Martin Compares to Other Months

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

This table compares monthly weather conditions in San Martin, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather27°C (80°F)19 mm (0.8 inches)44%extreme
February Weather25°C (77°F)17 mm (0.7 inches)48%extreme
March Weather22°C (72°F)17 mm (0.7 inches)56%extreme
April Weather18°C (65°F)15 mm (0.6 inches)67%very high
May Weather14°C (57°F)11 mm (0.4 inches)66%high
June Weather9°C (49°F)6 mm (0.2 inches)58%moderate
July Weather9°C (48°F)8 mm (0.3 inches)58%moderate
August Weather12°C (54°F)3 mm (0.1 inches)52%high
September Weather16°C (61°F)12 mm (0.5 inches)45%very high
October Weather19°C (67°F)13 mm (0.5 inches)43%extreme
November Weather23°C (73°F)14 mm (0.5 inches)41%extreme
December Weather25°C (77°F)18 mm (0.7 inches)37%extreme

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