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December Weather in San Diego, Guatemala

Last updated: August 23, 2025

In December, the average temperature in San Diego, Guatemala is a pleasant 20°C (68°F). Expect a minimum of 10°C (50°F) and the possibility of reaching up to 32°C (90°F). With 13 mm (0.5 in) of precipitation over just 3 days, you might encounter some light showers, but the average humidity remains around 74%, adding a comfortable feel to the air.

December Temperature in San Diego

In December in San Diego, the average temperature is 20°C (68°F). Maximum temperatures can reach 32°C (90°F), while minimum temperatures can drop to as low as 10°C (50°F). This makes it an ideal time for travelers to enjoy a pleasant climate for outdoor activities and sightseeing.

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

The chart illustrates December temperature patterns in San Diego, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Diego, December typically has an average temperature of 20°C (68°F), with highs reaching up to 32°C (90°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec677071757674737473726968
Data source: Temperature data for San Diego 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 Diego

In San Diego in December, the precipitation amount is 13 mm (0.5 in) over a span of 3 days.

December Precipitation Trends in San Diego

The chart displays monthly precipitation patterns in San Diego, 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 Diego, December typically receives around 13 mm (0.5 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec86724126184581081251345613
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Diego

In San Diego in December humidity is 74%. With an average temperature of 20°C (68°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel exhausting, prompting travelers to seek shade and hydration more often.

December Average Humidity in San Diego

This chart illustrates the average monthly humidity levels in San Diego, 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 Diego is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%72%61%53%51%52%58%63%71%79%79%74%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Diego

In San Diego in December, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in San Diego.

Maximum UV Index Levels in San Diego for December

The chart shows the monthly maximum UV Index (UVI) for San Diego 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 Diego typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11131415141414141313109
Data source: San Diego 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 Diego Compares to Other Months

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

This table compares monthly weather conditions in San Diego, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather20°C (68°F)7 mm (0.3 inches)80%extreme
February Weather21°C (70°F)6 mm (0.2 inches)72%extreme
March Weather22°C (72°F)7 mm (0.3 inches)61%extreme
April Weather24°C (76°F)24 mm (0.9 inches)53%extreme
May Weather24°C (76°F)126 mm (4.9 inches)51%extreme
June Weather23°C (74°F)184 mm (7.2 inches)52%extreme
July Weather23°C (74°F)58 mm (2.3 inches)58%extreme
August Weather23°C (74°F)108 mm (4.3 inches)63%extreme
September Weather23°C (74°F)125 mm (4.9 inches)71%extreme
October Weather22°C (73°F)134 mm (5.3 inches)79%extreme
November Weather21°C (70°F)56 mm (2.2 inches)79%very high
December Weather20°C (68°F)13 mm (0.5 inches)74%very high

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