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December Weather in San Clemente, Mexico

Last updated: August 27, 2025

In December, the average temperature in San Clemente, Mexico hovers around 18°C (64°F), offering a comfortable climate. Expect temperatures to range from a cool 6°C (43°F) to a warm 30°C (87°F). During this month, precipitation averages 16 mm (0.6 in) spread over just 2 days, accompanied by an average humidity of 76%.

December Temperature in San Clemente

In December in San Clemente, the average temperature is 18°C (64°F). Maximums can reach 30°C (87°F), and minimums can be as low as 6°C (43°F). Be sure to pack layers to enjoy the pleasant weather while staying prepared for cooler evenings.

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

The chart illustrates December temperature patterns in San Clemente, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Clemente, December typically has an average temperature of 18°C (64°F), with highs reaching up to 30°C (87°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec636569717372707070706764
Data source: Temperature data for San Clemente 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 Clemente

In San Clemente in December, the precipitation amount is 16 mm (0.6 in) over a period of 2 days.

December Precipitation Trends in San Clemente

The chart displays monthly precipitation patterns in San Clemente, 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 Clemente, December typically receives around 16 mm (0.6 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec132632291611782212201012416
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Clemente

In San Clemente in December, humidity is 76%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel steamy and invigorating—perfect for exploring charming streets, though you might want to take breaks in the shade.

December Average Humidity in San Clemente

This chart illustrates the average monthly humidity levels in San Clemente, 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 Clemente is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%65%59%60%67%80%81%83%83%80%77%76%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Clemente

In San Clemente in December, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in San Clemente.

Maximum UV Index Levels in San Clemente for December

The chart shows the monthly maximum UV Index (UVI) for San Clemente 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 Clemente typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec9111414141413131412108
Data source: San Clemente 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 Clemente Compares to Other Months

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

This table compares monthly weather conditions in San Clemente, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (64°F)13 mm (0.5 inches)70%very high
February Weather18°C (65°F)26 mm (1.0 inches)65%extreme
March Weather20°C (69°F)3 mm (0.1 inches)59%extreme
April Weather22°C (71°F)2 mm (0.1 inches)60%extreme
May Weather23°C (73°F)29 mm (1.1 inches)67%extreme
June Weather22°C (73°F)161 mm (6.3 inches)80%extreme
July Weather21°C (71°F)178 mm (7.0 inches)81%extreme
August Weather21°C (71°F)221 mm (8.7 inches)83%extreme
September Weather21°C (70°F)220 mm (8.7 inches)83%extreme
October Weather21°C (70°F)101 mm (4.0 inches)80%extreme
November Weather20°C (68°F)24 mm (1.0 inches)77%very high
December Weather18°C (64°F)16 mm (0.6 inches)76%very high

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