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January Weather in San Juan, Peru

Last updated: August 27, 2025

In January, the average temperature in San Juan, Peru hovers around 26°C (79°F). Expect minimums of 21°C (71°F) and soaring maximums of 35°C (95°F). The area experiences considerable rainfall, with 251 mm (9.9 in) over 23 days, resulting in an average humidity of 84%. Be prepared for a warm and wet climate!

January Temperature in San Juan

In January in San Juan, the average temperature is 26°C (79°F). The maximum can reach 35°C (95°F) and the minimum can be as low as 21°C (71°F). This makes it an ideal time for travelers seeking warm and pleasant weather.

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

The chart illustrates January temperature patterns in San Juan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Juan, January typically has an average temperature of 26°C (79°F), with highs reaching up to 35°C (95°F) and lows dropping to around 21°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec797979797878777879797979
Data source: Temperature data for San Juan 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 Juan

In San Juan in January, the total precipitation amount is 251 mm (9.9 in), occurring over the course of 23 days.

January Precipitation Trends in San Juan

The chart displays monthly precipitation patterns in San Juan, 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 Juan, January typically receives around 251 mm (9.9 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec251226321305223193145107152188233273
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in San Juan

In San Juan in January, humidity is 84%. With an average temperature of 26°C (79°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel sticky and exhausting, yet the vibrant atmosphere and lush surroundings offer a refreshing allure that invites exploration.

January Average Humidity in San Juan

This chart illustrates the average monthly humidity levels in San Juan, 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 Juan is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%87%89%82%69%58%56%62%77%88%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in San Juan

In San Juan in January, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in San Juan.

Maximum UV Index Levels in San Juan for January

The chart shows the monthly maximum UV Index (UVI) for San Juan 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 Juan typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151617161312111213141313
Data source: San Juan 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 Juan Compares to Other Months

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

This table compares monthly weather conditions in San Juan, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (79°F)251 mm (9.9 inches)84%extreme
February Weather26°C (79°F)226 mm (8.9 inches)82%extreme
March Weather26°C (79°F)321 mm (12.7 inches)84%extreme
April Weather26°C (79°F)305 mm (12.0 inches)87%extreme
May Weather26°C (79°F)223 mm (8.8 inches)89%extreme
June Weather25°C (78°F)193 mm (7.6 inches)82%extreme
July Weather25°C (78°F)145 mm (5.7 inches)69%extreme
August Weather26°C (79°F)107 mm (4.2 inches)58%extreme
September Weather26°C (80°F)152 mm (6.0 inches)56%extreme
October Weather26°C (80°F)188 mm (7.4 inches)62%extreme
November Weather26°C (80°F)233 mm (9.2 inches)77%extreme
December Weather26°C (79°F)273 mm (10.7 inches)88%extreme

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