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January Weather in San Marcos, Peru

Last updated: August 27, 2025

In San Marcos, Peru, the average temperature in January hovers around 5°C (42°F). Expect chilly conditions with minimums reaching -5°C (23°F) and maximums soaring to 14°C (58°F). During this month, precipitation is significant, averaging 209 mm (8.2 in) over 26 days, coupled with a high average humidity of 88%. Prepare for a damp and cool experience!

January Temperature in San Marcos

In January in San Marcos, the average temperature is 5°C (42°F). Maximums can reach 14°C (58°F), while minimums can dip as low as -5°C (23°F). Travelers should pack layers to stay warm and comfortable during this chilly season.

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 5°C (42°F), with highs reaching up to 14°C (58°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec414241414140393940414242
Data source: Temperature data for San Marcos 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.

January Precipitation in San Marcos

In San Marcos in January, the precipitation amount is 209 mm (8.2 in) spread over 26 days, indicating a consistent pattern of rainfall throughout the month.

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 209 mm (8.2 inches) of precipitation spread over approximately 26 days.
JanFebMarAprMayJunJulAugSepOctNovDec209224272159101514155114179194232
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in San Marcos

In San Marcos in January humidity is 88%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less appealing and leading you to seek warmth indoors instead.

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 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%86%89%89%86%71%44%34%37%50%73%91%
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 reaches 21, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. You can find the hourly UV index in San Marcos to better plan your outdoor activities.

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 21, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec212021191613151519191819
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.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)209 mm (8.2 inches)88%extreme
February Weather6°C (42°F)224 mm (8.8 inches)86%extreme
March Weather5°C (42°F)272 mm (10.7 inches)89%extreme
April Weather5°C (42°F)159 mm (6.2 inches)89%extreme
May Weather5°C (41°F)101 mm (4.0 inches)86%extreme
June Weather5°C (41°F)51 mm (2.0 inches)71%extreme
July Weather4°C (39°F)41 mm (1.6 inches)44%extreme
August Weather4°C (40°F)55 mm (2.2 inches)34%extreme
September Weather4°C (40°F)114 mm (4.5 inches)37%extreme
October Weather5°C (41°F)179 mm (7.0 inches)50%extreme
November Weather6°C (42°F)194 mm (7.6 inches)73%extreme
December Weather6°C (42°F)232 mm (9.1 inches)91%extreme

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