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December Weather in Rio Santiago, Mexico

Last updated: August 26, 2025

In December, the average temperature in Rio Santiago, Mexico hovers around 16°C (62°F). Expect a range from a cool 4°C (40°F) to a warm 29°C (85°F). During this month, anticipate 72 mm (2.8 in) of precipitation spread over 11 days, accompanied by an average humidity of 88%. Be prepared for varying weather as you explore this unique destination!

December Temperature in Rio Santiago

In December in Rio Santiago, the average temperature is 16°C (62°F). Maximum temperatures can reach up to 29°C (85°F), while minima can drop as low as 4°C (40°F). This makes it a great time to visit Rio Santiago, as you can enjoy mild weather with the possibility of warm days and cool evenings.

December Weather in Rio Santiago: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Rio Santiago, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Santiago, December typically has an average temperature of 16°C (62°F), with highs reaching up to 29°C (85°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec616366707270697070686461
Data source: Temperature data for Rio Santiago 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 Rio Santiago

In Rio Santiago in December, the precipitation amount is 72 mm (2.8 in) over the course of 11 days.

December Precipitation Trends in Rio Santiago

The chart displays monthly precipitation patterns in Rio Santiago, 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 Rio Santiago, December typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec96838712418137523932240232817672
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rio Santiago

In Rio Santiago in December humidity is 88%. With an average temperature of 16°C (62°F), this humidity feels like a heavy blanket enveloping you, making each step feel sluggish and draining, which can be quite challenging for travelers.

December Average Humidity in Rio Santiago

This chart illustrates the average monthly humidity levels in Rio Santiago, 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 Rio Santiago is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%80%73%67%72%73%76%80%84%89%88%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rio Santiago

In Rio Santiago in December, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Rio Santiago.

Maximum UV Index Levels in Rio Santiago for December

The chart shows the monthly maximum UV Index (UVI) for Rio Santiago 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 Rio Santiago typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10121314141415131412109
Data source: Rio Santiago 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 Rio Santiago Compares to Other Months

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

This table compares monthly weather conditions in Rio Santiago, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather16°C (61°F)96 mm (3.8 inches)84%very high
February Weather17°C (64°F)83 mm (3.3 inches)80%extreme
March Weather19°C (66°F)87 mm (3.4 inches)73%extreme
April Weather21°C (70°F)124 mm (4.9 inches)67%extreme
May Weather22°C (72°F)181 mm (7.1 inches)72%extreme
June Weather21°C (71°F)375 mm (14.8 inches)73%extreme
July Weather21°C (70°F)239 mm (9.4 inches)76%extreme
August Weather21°C (70°F)322 mm (12.7 inches)80%extreme
September Weather21°C (70°F)402 mm (15.8 inches)84%extreme
October Weather20°C (68°F)328 mm (12.9 inches)89%extreme
November Weather18°C (64°F)176 mm (6.9 inches)88%very high
December Weather16°C (62°F)72 mm (2.8 inches)88%very high

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