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December Weather in San Marcelo, Panama

Last updated: August 27, 2025

In December, the average temperature in San Marcelo, Panama is a pleasant 25°C (78°F), with minimums dipping to 20°C (68°F) and highs reaching up to 32°C (90°F). Expect some rain, as 80 mm (3.1 in) of precipitation typically falls over 9 days. With an average humidity of 79%, the atmosphere is fairly moist, contributing to a lush landscape during this vibrant month.

December Temperature in San Marcelo

In December in San Marcelo, the average temperature is 25°C (78°F). Maximums can reach 32°C (90°F) and minimums can be as low as 20°C (68°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

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

The chart illustrates December temperature patterns in San Marcelo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Marcelo, December typically has an average temperature of 25°C (78°F), with highs reaching up to 32°C (90°F) and lows dropping to around 20°C (68°F).
JanFebMarAprMayJunJulAugSepOctNovDec787980807878787777777678
Data source: Temperature data for San Marcelo 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 Marcelo

In San Marcelo in December, the precipitation amount is 80 mm (3.1 in) spread over 9 days.

December Precipitation Trends in San Marcelo

The chart displays monthly precipitation patterns in San Marcelo, 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 Marcelo, December typically receives around 80 mm (3.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec32769632229631029433436636080
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Marcelo

In San Marcelo in December humidity is 79%. With an average temperature of 25°C (78°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities less inviting and requiring frequent breaks to stay refreshed.

December Average Humidity in San Marcelo

This chart illustrates the average monthly humidity levels in San Marcelo, 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 Marcelo is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%71%69%70%73%90%89%87%87%86%86%79%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Marcelo

In San Marcelo 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 Marcelo.

Maximum UV Index Levels in San Marcelo for December

The chart shows the monthly maximum UV Index (UVI) for San Marcelo 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 Marcelo typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121314151513141314141211
Data source: San Marcelo 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 Marcelo Compares to Other Months

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

This table compares monthly weather conditions in San Marcelo, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (78°F)32 mm (1.3 inches)72%extreme
February Weather26°C (79°F)7 mm (0.3 inches)71%extreme
March Weather27°C (80°F)6 mm (0.3 inches)69%extreme
April Weather27°C (80°F)96 mm (3.8 inches)70%extreme
May Weather26°C (78°F)322 mm (12.7 inches)73%extreme
June Weather25°C (78°F)296 mm (11.7 inches)90%extreme
July Weather25°C (78°F)310 mm (12.2 inches)88%extreme
August Weather25°C (78°F)294 mm (11.6 inches)87%extreme
September Weather25°C (77°F)334 mm (13.2 inches)87%extreme
October Weather25°C (77°F)366 mm (14.4 inches)86%extreme
November Weather25°C (77°F)360 mm (14.2 inches)86%extreme
December Weather25°C (78°F)80 mm (3.1 inches)79%extreme

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