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December Weather in San Fernando, United States

Last updated: June 24, 2025

In December, the average temperature in San Fernando, United States is a pleasant 12°C (54°F), with minimums dipping to 1°C (33°F) and reaching a comfortable maximum of 28°C (83°F). Expect about 84 mm (3.3 in) of precipitation over 5 days, contributing to an average humidity of 76%. Ideal for enjoying a blend of mild weather and refreshingly wet days!

December Temperature in San Fernando

In December in San Fernando, the average temperature is 12°C (54°F). Maximums can reach 28°C (83°F) and minimums can be as low as 1°C (33°F). This makes San Fernando an ideal destination for travelers seeking a mix of mild weather and comfortable conditions for exploring the outdoors.

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

The chart illustrates December temperature patterns in San Fernando, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Fernando, December typically has an average temperature of 12°C (54°F), with highs reaching up to 28°C (83°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec545557636571777774686154
Data source: Temperature data for San Fernando 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 Fernando

In San Fernando in December, the total precipitation amount is 84 mm (3.3 in) over a period of 5 days.

December Precipitation Trends in San Fernando

The chart displays monthly precipitation patterns in San Fernando, 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 Fernando, December typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec7762852015211392084
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Fernando

In San Fernando in December, humidity is 76%. With an average temperature of 12°C (54°F), this humidity feels like a heavy blanket enveloping you, making outdoor activities a bit uncomfortable and requiring frequent hydration while exploring.

December Average Humidity in San Fernando

This chart illustrates the average monthly humidity levels in San Fernando, 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 Fernando is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%82%76%68%58%52%46%39%48%59%72%76%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Fernando

In San Fernando in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in San Fernando for better planning.

Maximum UV Index Levels in San Fernando for December

The chart shows the monthly maximum UV Index (UVI) for San Fernando 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 Fernando typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111121110754
Data source: San Fernando 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 Fernando Compares to Other Months

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

This table compares monthly weather conditions in San Fernando, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)77 mm (3.0 inches)78%moderate
February Weather13°C (55°F)62 mm (2.5 inches)82%high
March Weather14°C (57°F)85 mm (3.3 inches)75%very high
April Weather17°C (63°F)20 mm (0.8 inches)68%very high
May Weather18°C (65°F)15 mm (0.6 inches)57%extreme
June Weather22°C (71°F)2 mm (0.1 inches)52%extreme
July Weather25°C (77°F)1 mm (0.0 inches)46%extreme
August Weather25°C (78°F)1 mm (0.0 inches)39%extreme
September Weather23°C (75°F)3 mm (0.1 inches)48%very high
October Weather20°C (69°F)9 mm (0.4 inches)59%high
November Weather16°C (62°F)20 mm (0.8 inches)72%moderate
December Weather12°C (54°F)84 mm (3.3 inches)76%moderate

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