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December Weather in San Bernardino, Peru

Last updated: August 27, 2025

In San Bernardino, Peru, the average temperature in December is a pleasant 15°C (60°F), with a minimum dipping to 6°C (42°F) and a maximum reaching up to 24°C (76°F). Expect a rather wet month, with 428 mm (16.9 in) of precipitation spread over 25 days, and humidity levels hovering around 82%.

December Temperature in San Bernardino

In December in San Bernardino, the average temperature is 15°C (60°F). Maximums can reach 24°C (76°F), and minimums can be as low as 6°C (42°F). This makes it a great time for travelers to enjoy mild weather and a pleasant atmosphere for outdoor activities.

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

The chart illustrates December temperature patterns in San Bernardino, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Bernardino, December typically has an average temperature of 15°C (60°F), with highs reaching up to 24°C (76°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec595959596061616161606060
Data source: Temperature data for San Bernardino 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 Bernardino

In San Bernardino in December, the precipitation amount is 428 mm (16.9 in) spread over 25 days.

December Precipitation Trends in San Bernardino

The chart displays monthly precipitation patterns in San Bernardino, 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 Bernardino, December typically receives around 428 mm (16.9 inches) of precipitation spread over approximately 25 days.
JanFebMarAprMayJunJulAugSepOctNovDec3254105524603471278249184299179428
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Bernardino

In San Bernardino in December humidity is 82%. With an average temperature of 15°C (60°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and draining, which can hinder your travel experience.

December Average Humidity in San Bernardino

This chart illustrates the average monthly humidity levels in San Bernardino, 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 Bernardino is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%88%85%78%62%44%38%42%58%69%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Bernardino

In San Bernardino 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 Bernardino.

Maximum UV Index Levels in San Bernardino for December

The chart shows the monthly maximum UV Index (UVI) for San Bernardino 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 Bernardino typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec171718171412131316161615
Data source: San Bernardino 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 Bernardino Compares to Other Months

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

This table compares monthly weather conditions in San Bernardino, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather15°C (60°F)325 mm (12.8 inches)83%extreme
February Weather15°C (59°F)410 mm (16.2 inches)81%extreme
March Weather15°C (59°F)552 mm (21.7 inches)88%extreme
April Weather15°C (60°F)460 mm (18.1 inches)85%extreme
May Weather16°C (60°F)347 mm (13.7 inches)78%extreme
June Weather16°C (61°F)127 mm (5.0 inches)62%extreme
July Weather16°C (61°F)82 mm (3.2 inches)44%extreme
August Weather16°C (62°F)49 mm (1.9 inches)38%extreme
September Weather16°C (62°F)184 mm (7.3 inches)42%extreme
October Weather16°C (61°F)299 mm (11.8 inches)58%extreme
November Weather16°C (60°F)179 mm (7.0 inches)69%extreme
December Weather15°C (60°F)428 mm (16.9 inches)82%extreme

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