January Weather in San Marcos, Mexico

Last updated: August 27, 2025

In January, the average temperature in San Marcos, Mexico hovers around 27°C (80°F), offering a comfortable climate. Temperatures can dip to a minimum of 19°C (66°F) and rise to a maximum of 36°C (97°F), providing a delightful range for all outdoor activities. With only 2 mm (0.1 in) of precipitation over 0 days, you can expect mostly dry conditions. Additionally, the average humidity stands at 65%, ensuring a pleasant atmosphere throughout the month.

January Temperature in San Marcos

In January in San Marcos, the average temperature is 27°C (80°F), with maximums reaching 36°C (97°F) and minimums dropping as low as 19°C (66°F). This climate makes San Marcos an ideal destination for travelers looking to enjoy warm and pleasant weather.

January Weather in San Marcos: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in San Marcos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Marcos, January typically has an average temperature of 27°C (80°F), with highs reaching up to 36°C (97°F) and lows dropping to around 19°C (66°F).

Data source: Temperature data for San Marcos generated using information from the Copernicus Climate Change Service.

January Precipitation in San Marcos

In San Marcos in January, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

January Precipitation Trends in San Marcos

The chart displays monthly precipitation patterns in San Marcos, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In San Marcos, January typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in San Marcos

In San Marcos in January humidity is 65%. With an average temperature of 27°C (80°F), this humidity feels like a warm blanket wrapped around you, making outdoor exploration a bit sticky but still enjoyable. The air feels thick and slightly heavy, which can lead to quicker fatigue during sightseeing, so it’s wise to stay hydrated and take breaks in the shade.

January Average Humidity in San Marcos

This chart illustrates the average monthly humidity levels in San Marcos, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in San Marcos is approximately 65%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in San Marcos

In San Marcos in January, 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 Marcos.

Maximum UV Index Levels in San Marcos for January

The chart shows the monthly maximum UV Index (UVI) for San Marcos in January, 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 January, the maximum UV index in San Marcos typically reaches 9, which falls under the very high exposure category.

Data source: San Marcos January 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 January Weather in San Marcos Compares to Other Months

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

This table compares monthly weather conditions in San Marcos, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (80°F)	2 mm (0.1 inches)	65%	very high
February Weather	27°C (81°F)	1 mm (0.0 inches)	61%	extreme
March Weather	28°C (82°F)	0 mm (0.0 inches)	59%	extreme
April Weather	28°C (83°F)	1 mm (0.1 inches)	62%	extreme
May Weather	29°C (84°F)	13 mm (0.5 inches)	73%	extreme
June Weather	28°C (82°F)	237 mm (9.3 inches)	78%	extreme
July Weather	29°C (84°F)	105 mm (4.1 inches)	79%	extreme
August Weather	28°C (83°F)	262 mm (10.3 inches)	82%	extreme
September Weather	27°C (81°F)	303 mm (11.9 inches)	82%	extreme
October Weather	27°C (81°F)	228 mm (9.0 inches)	79%	extreme
November Weather	27°C (81°F)	43 mm (1.7 inches)	72%	very high
December Weather	27°C (80°F)	19 mm (0.8 inches)	70%	very high