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December Weather in Costa Rica, Peru

Last updated: August 27, 2025

In December, the average temperature in Costa Rica, Peru is a pleasant 25°C (78°F). Expect minimums around 19°C (67°F) and maximums soaring to 33°C (93°F). With precipitation reaching 220 mm (8.7 in) over 26 days, you'll want to prepare for some rainy spells. The atmosphere is quite humid, with an average humidity of 89%, making it a warm and muggy experience.

December Temperature in Costa Rica

In December in Costa Rica, the average temperature is 25°C (78°F). Maximums can reach 33°C (93°F), while minimums can dip as low as 19°C (67°F). Overall, this makes for pleasant weather, ideal for travelers seeking a comfortable climate to explore the area.

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 25°C (78°F), with highs reaching up to 33°C (93°F) and lows dropping to around 19°C (67°F).
JanFebMarAprMayJunJulAugSepOctNovDec777777777675757778797877
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 220 mm (8.7 in) over the course of 26 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 220 mm (8.7 inches) of precipitation spread over approximately 26 days.
JanFebMarAprMayJunJulAugSepOctNovDec21721224217414894626153146247220
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 89%. With an average temperature of 25°C (78°F), this humidity feels like a warm, dense blanket enveloping you, making travel slightly uncomfortable as you sweat and struggle to keep cool while exploring the local sights.

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 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%76%81%86%86%70%47%37%42%62%76%89%
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 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Costa Rica, you can check here.

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 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151616161411111214151414
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 Weather25°C (77°F)217 mm (8.5 inches)80%extreme
February Weather25°C (77°F)212 mm (8.4 inches)76%extreme
March Weather25°C (77°F)242 mm (9.5 inches)81%extreme
April Weather25°C (77°F)174 mm (6.9 inches)86%extreme
May Weather25°C (76°F)148 mm (5.8 inches)86%extreme
June Weather24°C (76°F)94 mm (3.7 inches)70%extreme
July Weather24°C (75°F)62 mm (2.5 inches)47%extreme
August Weather25°C (77°F)61 mm (2.4 inches)37%extreme
September Weather26°C (79°F)53 mm (2.1 inches)42%extreme
October Weather26°C (79°F)146 mm (5.7 inches)62%extreme
November Weather25°C (78°F)247 mm (9.7 inches)76%extreme
December Weather25°C (78°F)220 mm (8.7 inches)89%extreme

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