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December Weather in San Rafael Arriba, Costa Rica

Last updated: August 23, 2025

In December, the average temperature in San Rafael Arriba, Costa Rica hovers around 18°C (64°F), offering a comfortable climate. Expect minimums of 12°C (55°F) and maximums of 24°C (75°F). However, be prepared for some rain, as the area experiences an average precipitation of 156 mm (6.1 in) over 16 days. Additionally, humidity levels remain relatively high at 72%, contributing to the region's unique atmosphere.

December Temperature in San Rafael Arriba

In December in San Rafael Arriba, the average temperature is 18°C (64°F). Maximum temperatures can reach 24°C (75°F), while the minimum can drop to as low as 12°C (55°F). This makes San Rafael Arriba a pleasant destination for travelers looking to enjoy mild and comfortable weather.

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

The chart illustrates December temperature patterns in San Rafael Arriba, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Rafael Arriba, December typically has an average temperature of 18°C (64°F), with highs reaching up to 24°C (75°F) and lows dropping to around 12°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec636364666666666666656564
Data source: Temperature data for San Rafael Arriba 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 Rafael Arriba

In San Rafael Arriba in December, the precipitation amount is 156 mm (6.1 in) spread over 16 days.

December Precipitation Trends in San Rafael Arriba

The chart displays monthly precipitation patterns in San Rafael Arriba, 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 Rafael Arriba, December typically receives around 156 mm (6.1 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec934349113425341266304380517260156
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Rafael Arriba

In San Rafael Arriba in December, humidity is 72%. With an average temperature of 18°C (64°F), this humidity feels like a warm, sticky embrace, making travel somewhat uncomfortable as the air clings to your skin, leaving you longing for a refreshing breeze.

December Average Humidity in San Rafael Arriba

This chart illustrates the average monthly humidity levels in San Rafael Arriba, 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 Rafael Arriba is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec68%68%66%67%69%84%85%82%81%80%80%73%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Rafael Arriba

In San Rafael Arriba in December, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in San Rafael Arriba.

Maximum UV Index Levels in San Rafael Arriba for December

The chart shows the monthly maximum UV Index (UVI) for San Rafael Arriba 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 Rafael Arriba typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121415161414141414151211
Data source: San Rafael Arriba 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 Rafael Arriba Compares to Other Months

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

This table compares monthly weather conditions in San Rafael Arriba, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)93 mm (3.7 inches)68%extreme
February Weather17°C (64°F)43 mm (1.7 inches)68%extreme
March Weather18°C (64°F)49 mm (1.9 inches)66%extreme
April Weather19°C (66°F)113 mm (4.4 inches)67%extreme
May Weather19°C (67°F)425 mm (16.7 inches)69%extreme
June Weather19°C (67°F)341 mm (13.4 inches)84%extreme
July Weather19°C (66°F)266 mm (10.5 inches)85%extreme
August Weather19°C (66°F)304 mm (12.0 inches)82%extreme
September Weather19°C (66°F)379 mm (14.9 inches)81%extreme
October Weather19°C (66°F)517 mm (20.4 inches)80%extreme
November Weather18°C (65°F)260 mm (10.3 inches)80%extreme
December Weather18°C (64°F)156 mm (6.1 inches)72%extreme

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