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December Weather in Costa Rica, Mexico

Last updated: August 26, 2025

In December, the average temperature in Costa Rica, Mexico is a pleasant 21°C (71°F). While daytime can reach a comfortable 32°C (90°F), evenings may cool to a minimum of 10°C (51°F). Expect 14 mm (0.5 in) of precipitation spread over 4 days, with an average humidity of 76% adding to the area's distinct climate.

December Temperature in Costa Rica

In December in Costa Rica, the average temperature is 21°C (71°F). Maximums can reach 32°C (90°F), and minimums can be as low as 10°C (51°F). This mild climate makes it an ideal destination for travelers seeking comfortable weather.

December Weather in Costa Rica: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Costa Rica, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Costa Rica, December typically has an average temperature of 21°C (71°F), with highs reaching up to 32°C (90°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec707275787875757675737270
Data source: Temperature data for Costa Rica 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 Costa Rica

In Costa Rica in December, the precipitation amount is 14 mm (0.5 in) over a span of 4 days.

December Precipitation Trends in Costa Rica

The chart displays monthly precipitation patterns in Costa Rica, 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 Costa Rica, December typically receives around 14 mm (0.5 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec138621118305811372161804214
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Costa Rica

In Costa Rica in December humidity is 76%. With an average temperature of 21°C (71°F), this humidity feels like a warm, enveloping blanket, making traveling both refreshing and a bit exhausting, as the air clings to your skin and you often find yourself reaching for water to stay hydrated.

December Average Humidity in Costa Rica

This chart illustrates the average monthly humidity levels in Costa Rica, 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 Costa Rica is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%68%59%57%65%66%75%82%82%83%80%76%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Costa Rica

In Costa Rica 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 Costa Rica.

Maximum UV Index Levels in Costa Rica for December

The chart shows the monthly maximum UV Index (UVI) for Costa Rica 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 Costa Rica typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11131415141415141413119
Data source: Costa Rica 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 Costa Rica Compares to Other Months

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

This table compares monthly weather conditions in Costa Rica, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather21°C (70°F)13 mm (0.5 inches)76%extreme
February Weather22°C (72°F)8 mm (0.3 inches)68%extreme
March Weather24°C (75°F)6 mm (0.2 inches)59%extreme
April Weather26°C (78°F)21 mm (0.8 inches)57%extreme
May Weather26°C (79°F)118 mm (4.6 inches)65%extreme
June Weather24°C (75°F)305 mm (12.0 inches)66%extreme
July Weather24°C (76°F)81 mm (3.2 inches)75%extreme
August Weather24°C (76°F)137 mm (5.4 inches)82%extreme
September Weather24°C (75°F)216 mm (8.5 inches)82%extreme
October Weather23°C (74°F)180 mm (7.1 inches)83%extreme
November Weather22°C (72°F)42 mm (1.6 inches)80%extreme
December Weather21°C (71°F)14 mm (0.5 inches)76%very high

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