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December Weather in San Isidro, Mexico

Last updated: August 27, 2025

In December, the average temperature in San Isidro, Mexico hovers around 12°C (55°F). Expect a chilly minimum of -6°C (21°F), with a surprising maximum reaching up to 27°C (81°F). This month also brings 14 mm (0.5 in) of precipitation over the course of just 1 day, while the air remains quite humid with an average of 87%.

December Temperature in San Isidro

In December in San Isidro, the average temperature is 12°C (55°F). Maximum temperatures can reach 27°C (81°F), while minimums can drop to as low as -6°C (21°F). Be prepared for a wide range of temperatures when traveling to San Isidro during this time.

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

The chart illustrates December temperature patterns in San Isidro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Isidro, December typically has an average temperature of 12°C (55°F), with highs reaching up to 27°C (81°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec545863677170697067655954
Data source: Temperature data for San Isidro 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 Isidro

In San Isidro in December, the precipitation amount is 14 mm (0.5 in) over the course of 1 day.

December Precipitation Trends in San Isidro

The chart displays monthly precipitation patterns in San Isidro, 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 Isidro, December typically receives around 14 mm (0.5 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec111015244648843375441214
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Isidro

In San Isidro in December humidity is 87%. With an average temperature of 12°C (55°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities less enjoyable and requiring extra layers for comfort while traveling.

December Average Humidity in San Isidro

This chart illustrates the average monthly humidity levels in San Isidro, 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 Isidro is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%69%65%64%75%78%67%64%82%86%87%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Isidro

In San Isidro in December, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in San Isidro.

Maximum UV Index Levels in San Isidro for December

The chart shows the monthly maximum UV Index (UVI) for San Isidro 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 Isidro typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec811131414141414131297
Data source: San Isidro 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 Isidro Compares to Other Months

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

This table compares monthly weather conditions in San Isidro, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)11 mm (0.4 inches)75%very high
February Weather15°C (59°F)9 mm (0.4 inches)69%extreme
March Weather17°C (64°F)15 mm (0.6 inches)65%extreme
April Weather20°C (67°F)24 mm (0.9 inches)64%extreme
May Weather21°C (71°F)46 mm (1.8 inches)75%extreme
June Weather21°C (71°F)48 mm (1.9 inches)78%extreme
July Weather21°C (69°F)84 mm (3.3 inches)67%extreme
August Weather21°C (70°F)33 mm (1.3 inches)64%extreme
September Weather20°C (67°F)75 mm (3.0 inches)81%extreme
October Weather18°C (65°F)44 mm (1.7 inches)85%extreme
November Weather15°C (59°F)12 mm (0.5 inches)87%very high
December Weather12°C (55°F)14 mm (0.5 inches)87%high

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