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December Weather in San Salvador, Peru

Last updated: August 27, 2025

In December, the average temperature in San Salvador, Peru hovers around 9°C (49°F), making it a cool yet refreshing time. Expect minimums to dip to 2°C (36°F) and maximums to reach 19°C (66°F). However, be prepared for ample precipitation, with 254 mm (10.0 in) falling over 29 days, contributing to an average humidity of 93%.

December Temperature in San Salvador

In December in San Salvador, the average temperature is 9°C (49°F). Maximum temperatures can reach 19°C (66°F), while the minimum can drop as low as 2°C (36°F). It's a great time for travelers to experience mild weather and enjoy outdoor activities in San Salvador.

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 9°C (49°F), with highs reaching up to 19°C (66°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec484848474645444546484949
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 254 mm (10.0 in), spread over 29 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 254 mm (10.0 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec1902662031307363506590127156254
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 93%. With an average temperature of 9°C (49°F), this humidity feels like a dense, damp blanket enveloping you, making traveling quite uncomfortable as you navigate through the heavy, moist air.

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 93%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec94%92%92%90%88%77%55%44%51%64%84%93%
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 reaches 20, which falls under the extreme Exposure Category. This means that the time to burn is just 10 minutes. To stay informed about the hourly UV Index in San Salvador, you can visit 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 20, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec221919171411131417182220
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 Weather9°C (48°F)189 mm (7.5 inches)94%extreme
February Weather9°C (48°F)266 mm (10.5 inches)92%extreme
March Weather9°C (48°F)203 mm (8.0 inches)92%extreme
April Weather8°C (47°F)129 mm (5.1 inches)90%extreme
May Weather8°C (46°F)73 mm (2.9 inches)88%extreme
June Weather7°C (45°F)63 mm (2.5 inches)77%extreme
July Weather7°C (44°F)50 mm (2.0 inches)55%extreme
August Weather7°C (45°F)65 mm (2.6 inches)44%extreme
September Weather8°C (46°F)90 mm (3.5 inches)51%extreme
October Weather9°C (48°F)127 mm (5.0 inches)64%extreme
November Weather10°C (49°F)156 mm (6.1 inches)84%extreme
December Weather9°C (49°F)254 mm (10.0 inches)93%extreme

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