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December Weather in Costa Rica, Brazil

Last updated: August 22, 2025

In December, the average temperature in Costa Rica, Brazil hovers around 26°C (78°F). You might experience a refreshing low of 14°C (58°F) and a toasty high of 37°C (99°F). Expect 216 mm (8.5 in) of precipitation spread over 14 days, contributing to an average humidity of 84%. Perfect for those who love a little tropical flair!

December Temperature in Costa Rica

In December in Costa Rica, the average temperature is 26°C (78°F). The maximum can reach 37°C (99°F) and the minimum can be as low as 14°C (58°F). Be prepared for warm days and cool evenings, making it an ideal time for both sightseeing and outdoor activities.

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 26°C (78°F), with highs reaching up to 37°C (99°F) and lows dropping to around 14°C (58°F).
JanFebMarAprMayJunJulAugSepOctNovDec797877736865646775767778
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 total precipitation amount is 216 mm (8.5 in) spread over 14 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 216 mm (8.5 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec160131146639888239557176100216
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 84%. With an average temperature of 26°C (78°F), this humidity feels like walking through a warm, moist blanket, making outdoor activities feel heavy and exhausting for travelers.

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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%83%82%76%67%61%52%42%42%43%68%84%
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 reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial 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 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec15151311867911141515
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 Weather26°C (79°F)160 mm (6.3 inches)85%extreme
February Weather25°C (78°F)131 mm (5.1 inches)83%extreme
March Weather25°C (77°F)146 mm (5.8 inches)82%extreme
April Weather23°C (73°F)63 mm (2.5 inches)76%extreme
May Weather20°C (68°F)98 mm (3.9 inches)67%very high
June Weather18°C (65°F)88 mm (3.5 inches)61%high
July Weather18°C (64°F)23 mm (0.9 inches)52%high
August Weather20°C (68°F)94 mm (3.7 inches)42%very high
September Weather24°C (75°F)57 mm (2.2 inches)42%extreme
October Weather24°C (76°F)176 mm (6.9 inches)43%extreme
November Weather25°C (77°F)100 mm (3.9 inches)68%extreme
December Weather26°C (78°F)216 mm (8.5 inches)84%extreme

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