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January Weather in San Antonio, Puerto Rico

Last updated: August 31, 2025

In San Antonio, Puerto Rico, the average temperature in January hovers around 25°C (77°F). Expect a comfortable range, with temperatures dipping to a minimum of 20°C (69°F) and reaching as high as 29°C (84°F). Be prepared for some rainfall, as the area receives approximately 34 mm (1.3 in) of precipitation over 11 days. Don’t forget, the average humidity sits at a noteworthy 76%, contributing to a pleasantly warm atmosphere.

January Temperature in San Antonio

In January in San Antonio, the average temperature is 25°C (77°F). Maximums can reach 29°C (84°F), while minimums can be as low as 20°C (69°F). This climate makes it an ideal destination for travelers looking to enjoy warm weather and outdoor activities.

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

The chart illustrates January temperature patterns in San Antonio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Antonio, January typically has an average temperature of 25°C (77°F), with highs reaching up to 29°C (84°F) and lows dropping to around 20°C (69°F).
JanFebMarAprMayJunJulAugSepOctNovDec767676777980818181807978
Data source: Temperature data for San Antonio 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 Antonio

In San Antonio in January, the precipitation amount is 34 mm (1.3 in) spread over 11 days.

January Precipitation Trends in San Antonio

The chart displays monthly precipitation patterns in San Antonio, 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 Antonio, January typically receives around 34 mm (1.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec34397266978591971881279943
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in San Antonio

In San Antonio in January, humidity is 76%. With an average temperature of 25°C (77°F), this humidity feels like a warm, heavy blanket wrapping around you, making traveling feel muggy and requiring frequent breaks to stay refreshed.

January Average Humidity in San Antonio

This chart illustrates the average monthly humidity levels in San Antonio, 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 Antonio is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%74%75%75%77%80%80%79%78%78%76%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in San Antonio

In San Antonio 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 Antonio.

Maximum UV Index Levels in San Antonio for January

The chart shows the monthly maximum UV Index (UVI) for San Antonio 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 Antonio typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec911131314131313131298
Data source: San Antonio 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 Antonio Compares to Other Months

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

This table compares monthly weather conditions in San Antonio, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)34 mm (1.3 inches)76%very high
February Weather25°C (76°F)39 mm (1.5 inches)75%extreme
March Weather25°C (76°F)72 mm (2.8 inches)74%extreme
April Weather25°C (78°F)66 mm (2.6 inches)75%extreme
May Weather26°C (79°F)97 mm (3.8 inches)75%extreme
June Weather27°C (81°F)85 mm (3.3 inches)77%extreme
July Weather27°C (81°F)91 mm (3.6 inches)80%extreme
August Weather27°C (82°F)97 mm (3.8 inches)80%extreme
September Weather27°C (81°F)188 mm (7.4 inches)79%extreme
October Weather27°C (81°F)127 mm (5.0 inches)78%extreme
November Weather26°C (79°F)99 mm (3.9 inches)78%very high
December Weather25°C (78°F)43 mm (1.7 inches)76%very high

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