nomadseason

January Weather in San Juan, Philippines

Last updated: August 27, 2025

In San Juan, Philippines, the average temperature in January is a pleasant 23°C (74°F). You can expect minimum temperatures around 14°C (58°F) and maximums reaching 31°C (88°F). With an average precipitation of 36 mm (1.4 in) spread over 4 days, and a humidity level of 77%, it's a month where you might want to pack both your sunglasses and an umbrella!

January Temperature in San Juan

In January in San Juan, the average temperature is 23°C (74°F), with maximums reaching up to 31°C (88°F) and minimums dropping as low as 14°C (58°F). This mild climate makes San Juan an ideal destination for travelers seeking pleasant weather and outdoor activities.

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 23°C (74°F), with highs reaching up to 31°C (88°F) and lows dropping to around 14°C (58°F).
JanFebMarAprMayJunJulAugSepOctNovDec747477787978777677777675
Data source: Temperature data for San Juan generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 precipitation amount is 36 mm (1.4 in) over the course of 4 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 36 mm (1.4 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec3628286117735553449037720710660
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

January Humidity in San Juan

In San Juan in January, humidity is 77%. With an average temperature of 23°C (74°F), this humidity feels like being enveloped in a warm, sticky blanket, making travel somewhat uncomfortable and requiring frequent hydration breaks to enjoy the sights without feeling overheated.

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 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%73%71%73%77%85%86%87%87%86%89%85%
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 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11131415131414151413119
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 Weather23°C (74°F)36 mm (1.4 inches)77%extreme
February Weather23°C (74°F)28 mm (1.1 inches)73%extreme
March Weather25°C (77°F)28 mm (1.1 inches)71%extreme
April Weather26°C (79°F)61 mm (2.4 inches)73%extreme
May Weather26°C (79°F)177 mm (7.0 inches)77%extreme
June Weather26°C (78°F)355 mm (14.0 inches)85%extreme
July Weather25°C (77°F)534 mm (21.0 inches)86%extreme
August Weather25°C (77°F)490 mm (19.3 inches)87%extreme
September Weather25°C (77°F)377 mm (14.9 inches)87%extreme
October Weather25°C (77°F)207 mm (8.2 inches)86%extreme
November Weather25°C (77°F)106 mm (4.2 inches)89%extreme
December Weather24°C (75°F)60 mm (2.3 inches)85%very high

Compare San Juan's Climate with Cities Worldwide