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December Weather in San Salvador, Mexico

Last updated: August 27, 2025

In December, the average temperature in San Salvador, Mexico hovers around 18°C (65°F). Expect temperatures to range from a chilly 4°C (40°F) to a warm 28°C (83°F). Humidity is typically high, averaging 86%, accompanied by 93 mm (3.7 in) of precipitation spread over 13 days.

December Temperature in San Salvador

In December in San Salvador, the average temperature is 18°C (65°F), with maximums reaching up to 28°C (83°F) and minimums dipping as low as 4°C (40°F). This varied climate makes it an ideal destination for travelers seeking both warmth and cooler escapes.

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

The chart illustrates December temperature patterns in San Salvador, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Salvador, December typically has an average temperature of 18°C (65°F), with highs reaching up to 28°C (83°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec646668737472727271706764
Data source: Temperature data for San Salvador 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 Salvador

In San Salvador in December, the total precipitation amount is 93 mm (3.7 in), which falls over the course of 13 days.

December Precipitation Trends in San Salvador

The chart displays monthly precipitation patterns in San Salvador, 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 Salvador, December typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec9950398117629211718924029816994
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Salvador

In San Salvador in December humidity is 86%. With an average temperature of 18°C (65°F), this humidity feels like you’re wrapped in a warm, heavy blanket, making outdoor activities feel quite muggy and sticky for traveling.

December Average Humidity in San Salvador

This chart illustrates the average monthly humidity levels in San Salvador, 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 Salvador is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%73%59%53%54%55%61%71%77%78%82%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Salvador

In San Salvador 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 San Salvador.

Maximum UV Index Levels in San Salvador for December

The chart shows the monthly maximum UV Index (UVI) for San Salvador 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 Salvador typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10121414141414131312109
Data source: San Salvador 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 Salvador Compares to Other Months

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

This table compares monthly weather conditions in San Salvador, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather18°C (64°F)99 mm (3.9 inches)84%very high
February Weather19°C (66°F)50 mm (2.0 inches)73%extreme
March Weather20°C (68°F)39 mm (1.5 inches)59%extreme
April Weather23°C (73°F)81 mm (3.2 inches)52%extreme
May Weather23°C (74°F)175 mm (6.9 inches)53%extreme
June Weather22°C (72°F)292 mm (11.5 inches)55%extreme
July Weather22°C (72°F)117 mm (4.6 inches)61%extreme
August Weather22°C (72°F)189 mm (7.5 inches)71%extreme
September Weather22°C (71°F)240 mm (9.5 inches)77%extreme
October Weather21°C (70°F)298 mm (11.7 inches)78%extreme
November Weather19°C (67°F)169 mm (6.7 inches)82%very high
December Weather18°C (65°F)93 mm (3.7 inches)86%very high

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