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December Weather in Casillas, Guatemala

Last updated: August 23, 2025

In December, the average temperature in Casillas, Guatemala is a pleasant 18°C (65°F). While you might enjoy warm days peaking at 29°C (84°F), don’t be surprised if the mercury dips to a cool 8°C (46°F) at times. Expect 17 mm (0.7 in) of rain spread across 3 days, and prepare for a fairly humid atmosphere, with average humidity levels at 76%.

December Temperature in Casillas

In December in Casillas, the average temperature is 18°C (65°F). Maximums can reach 29°C (84°F) and minimums can be as low as 8°C (46°F). This mild climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

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

The chart illustrates December temperature patterns in Casillas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Casillas, December typically has an average temperature of 18°C (65°F), with highs reaching up to 29°C (84°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec646668706968686868676664
Data source: Temperature data for Casillas 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 Casillas

In Casillas in December, the precipitation amount is 17 mm (0.7 in) over the course of 3 days.

December Precipitation Trends in Casillas

The chart displays monthly precipitation patterns in Casillas, 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 Casillas, December typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec997622573781712583142875217
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Casillas

In Casillas in December, humidity is 76%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making travel a little sticky but enjoyable, as long as you stay hydrated and take breaks in the shade.

December Average Humidity in Casillas

This chart illustrates the average monthly humidity levels in Casillas, 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 Casillas is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%68%59%57%65%66%75%82%82%83%80%76%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Casillas

In Casillas 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 Casillas.

Maximum UV Index Levels in Casillas for December

The chart shows the monthly maximum UV Index (UVI) for Casillas 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 Casillas typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec111314151414141414131010
Data source: Casillas 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 Casillas Compares to Other Months

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

This table compares monthly weather conditions in Casillas, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather18°C (64°F)8 mm (0.3 inches)76%extreme
February Weather19°C (66°F)9 mm (0.4 inches)68%extreme
March Weather20°C (68°F)7 mm (0.3 inches)59%extreme
April Weather21°C (70°F)62 mm (2.5 inches)57%extreme
May Weather21°C (69°F)257 mm (10.1 inches)65%extreme
June Weather20°C (68°F)378 mm (14.9 inches)66%extreme
July Weather20°C (68°F)170 mm (6.7 inches)75%extreme
August Weather20°C (68°F)258 mm (10.2 inches)82%extreme
September Weather20°C (68°F)314 mm (12.4 inches)82%extreme
October Weather19°C (67°F)287 mm (11.3 inches)83%extreme
November Weather19°C (66°F)52 mm (2.0 inches)80%very high
December Weather18°C (65°F)17 mm (0.7 inches)76%very high

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