December Weather in Belen, Costa Rica

Last updated: August 23, 2025

In December, the average temperature in Belen, Costa Rica is a warm 27°C (80°F), making it a delightful time to explore. Temperatures can dip to a comfortable minimum of 20°C (69°F) and occasionally reach a sunny maximum of 34°C (93°F). Expect a small amount of precipitation, averaging 12 mm (0.5 in) over just 1 day, while enjoying a relatively high average humidity of 70%.

December Temperature in Belen

In December in Belen, the average temperature is 27°C (80°F), with maximums reaching 34°C (93°F) and minimums dropping to as low as 20°C (69°F). This mild and warm weather makes it an ideal destination for travelers seeking pleasant conditions to explore and relax.

December Weather in Belen: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Belen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Belen, December typically has an average temperature of 27°C (80°F), with highs reaching up to 34°C (93°F) and lows dropping to around 20°C (69°F).

Data source: Temperature data for Belen generated using information from the Copernicus Climate Change Service.

December Precipitation in Belen

In Belen in December, the precipitation amount is 12 mm (0.5 in) over the course of 1 day.

December Precipitation Trends in Belen

The chart displays monthly precipitation patterns in Belen, 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 Belen, December typically receives around 12 mm (0.5 inches) of precipitation spread over approximately 1 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Belen

In Belen in December humidity is 70%. With an average temperature of 27°C (80°F), this humidity feels like you're enveloped in a warm, heavy blanket, making traveling feel a bit more challenging. The air tends to weigh you down, and you may find yourself needing to take frequent breaks to stay refreshed.

December Average Humidity in Belen

This chart illustrates the average monthly humidity levels in Belen, 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 Belen is approximately 70%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Belen

In Belen in December, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Belen.

Maximum UV Index Levels in Belen for December

The chart shows the monthly maximum UV Index (UVI) for Belen 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 Belen typically reaches 10, which falls under the very high exposure category.

Data source: Belen 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 Belen Compares to Other Months

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

This table compares monthly weather conditions in Belen, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (81°F)	5 mm (0.2 inches)	66%	extreme
February Weather	28°C (82°F)	1 mm (0.0 inches)	64%	extreme
March Weather	28°C (83°F)	1 mm (0.0 inches)	63%	extreme
April Weather	29°C (85°F)	35 mm (1.4 inches)	63%	extreme
May Weather	28°C (82°F)	255 mm (10.1 inches)	63%	extreme
June Weather	27°C (81°F)	289 mm (11.4 inches)	74%	extreme
July Weather	27°C (81°F)	115 mm (4.5 inches)	85%	extreme
August Weather	27°C (81°F)	224 mm (8.8 inches)	82%	extreme
September Weather	26°C (79°F)	277 mm (10.9 inches)	80%	extreme
October Weather	26°C (79°F)	374 mm (14.7 inches)	79%	extreme
November Weather	26°C (79°F)	138 mm (5.4 inches)	79%	extreme
December Weather	27°C (80°F)	12 mm (0.5 inches)	70%	very high