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December Weather in San Mateo, Guatemala

Last updated: August 23, 2025

In December, the average temperature in San Mateo, Guatemala hovers around 17°C (63°F). Expect a minimum of 10°C (51°F) and a maximum reaching 24°C (75°F). This month also brings about 48 mm (1.9 in) of precipitation, spread over approximately 12 days, resulting in an average humidity of 76%.

December Temperature in San Mateo

In December in San Mateo, the average temperature is 17°C (63°F). The maximum can reach 24°C (75°F), and the minimum can be as low as 10°C (51°F). This mild climate makes it an ideal time for travelers to explore the vibrant surroundings and enjoy outdoor activities.

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

The chart illustrates December temperature patterns in San Mateo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Mateo, December typically has an average temperature of 17°C (63°F), with highs reaching up to 24°C (75°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec636364646565666565656463
Data source: Temperature data for San Mateo 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 Mateo

In San Mateo in December, the precipitation amount is 48 mm (1.9 in) over a span of 12 days.

December Precipitation Trends in San Mateo

The chart displays monthly precipitation patterns in San Mateo, 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 Mateo, December typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec325911024664447725841445737312248
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Mateo

In San Mateo in December humidity is 76%. With an average temperature of 17°C (63°F), this humidity feels like traveling through a warm, enveloping blanket, making every outdoor adventure feel sticky and heavy, yet pleasantly refreshing when you find a cool breeze.

December Average Humidity in San Mateo

This chart illustrates the average monthly humidity levels in San Mateo, 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 Mateo 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 San Mateo

In San Mateo in December, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in San Mateo.

Maximum UV Index Levels in San Mateo for December

The chart shows the monthly maximum UV Index (UVI) for San Mateo 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 Mateo typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11131415141414141413119
Data source: San Mateo 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 Mateo Compares to Other Months

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

This table compares monthly weather conditions in San Mateo, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)32 mm (1.2 inches)76%extreme
February Weather17°C (63°F)59 mm (2.3 inches)68%extreme
March Weather18°C (64°F)110 mm (4.3 inches)59%extreme
April Weather18°C (65°F)246 mm (9.7 inches)57%extreme
May Weather18°C (65°F)644 mm (25.4 inches)65%extreme
June Weather18°C (65°F)477 mm (18.8 inches)66%extreme
July Weather19°C (66°F)258 mm (10.2 inches)75%extreme
August Weather18°C (65°F)414 mm (16.3 inches)82%extreme
September Weather18°C (65°F)457 mm (18.0 inches)82%extreme
October Weather18°C (65°F)373 mm (14.7 inches)83%extreme
November Weather18°C (64°F)122 mm (4.8 inches)80%extreme
December Weather17°C (63°F)48 mm (1.9 inches)76%very high

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