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December Weather in Santa Monica, Mexico

Last updated: August 27, 2025

In December, the average temperature in Santa Monica, Mexico hovers around 23°C (73°F), making it a pleasant time to visit. Expect temperatures to range from a cool 8°C (46°F) to a warm 34°C (93°F). With just 1 mm (0.1 in) of precipitation over 0 days, you can anticipate mostly dry weather. However, keep in mind the average humidity is quite high at 88%, adding a touch of mugginess to the warm air.

December Temperature in Santa Monica

In December in Santa Monica, the average temperature is 23°C (73°F), with maximums reaching up to 34°C (93°F) and minimums dropping as low as 8°C (46°F). This varied climate makes Santa Monica an ideal destination for travelers seeking both warm days and cool evenings.

December Weather in Santa Monica: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Santa Monica, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Monica, December typically has an average temperature of 23°C (73°F), with highs reaching up to 34°C (93°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec737680838479787876777573
Data source: Temperature data for Santa Monica 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 Santa Monica

In Santa Monica in December, the precipitation amount is 1 mm (0.1 in) during 0 days, indicating a very dry period.

December Precipitation Trends in Santa Monica

The chart displays monthly precipitation patterns in Santa Monica, 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 Santa Monica, December typically receives around 1 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec223751200157207270108122
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Santa Monica

In Santa Monica in December, humidity is 88%. With an average temperature of 23°C (73°F), this humidity feels like a warm, sticky blanket enveloping you, making travel feel heavy and draining without frequent breaks for hydration and shade.

December Average Humidity in Santa Monica

This chart illustrates the average monthly humidity levels in Santa Monica, 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 Santa Monica is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%78%75%71%77%76%68%70%82%91%89%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Santa Monica

In Santa Monica 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 Santa Monica.

Maximum UV Index Levels in Santa Monica for December

The chart shows the monthly maximum UV Index (UVI) for Santa Monica 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 Santa Monica typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec911131413141413131298
Data source: Santa Monica 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 Santa Monica Compares to Other Months

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

This table compares monthly weather conditions in Santa Monica, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (73°F)1 mm (0.1 inches)84%very high
February Weather25°C (77°F)2 mm (0.1 inches)78%extreme
March Weather27°C (81°F)3 mm (0.1 inches)75%extreme
April Weather28°C (84°F)7 mm (0.3 inches)70%extreme
May Weather29°C (84°F)51 mm (2.0 inches)77%extreme
June Weather26°C (79°F)199 mm (7.9 inches)76%extreme
July Weather26°C (78°F)157 mm (6.2 inches)68%extreme
August Weather25°C (78°F)207 mm (8.1 inches)70%extreme
September Weather25°C (77°F)270 mm (10.6 inches)82%extreme
October Weather25°C (77°F)108 mm (4.2 inches)91%extreme
November Weather24°C (75°F)12 mm (0.5 inches)89%very high
December Weather23°C (73°F)1 mm (0.1 inches)88%very high

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