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March Weather in San Juan, United States

Last updated: June 24, 2025

In San Juan, United States, the average temperature in March is a pleasant 22°C (72°F), with a minimum dipping to 3°C (38°F) and a high soaring up to 37°C (98°F). Visitors can expect an average humidity of 76%, along with 31 mm (1.2 in) of precipitation over approximately 5 days. Prepare for a delightful mix of warmth and occasional showers!

March Temperature in San Juan

In March in San Juan, the average temperature is 22°C (72°F). Maximums can reach 37°C (98°F), while minimums can drop as low as 3°C (38°F). It's advisable to pack layers and stay hydrated while exploring the diverse weather conditions.

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

The chart illustrates March 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, March typically has an average temperature of 22°C (72°F), with highs reaching up to 37°C (98°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec616572778285868884776964
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.

March Precipitation in San Juan

In San Juan in March, the precipitation amount is 31 mm (1.2 in) spread over 5 days.

March Precipitation Trends in San Juan

The chart displays monthly precipitation patterns in San Juan, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In San Juan, March typically receives around 31 mm (1.2 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec2021313187811002296513021
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in San Juan

In San Juan in March humidity is 76%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making travel slightly uncomfortable as you navigate through the thick, saturated air.

March Average Humidity in San Juan

This chart illustrates the average monthly humidity levels in San Juan, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in San Juan is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%76%77%80%73%66%65%73%76%80%86%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in San Juan

In San Juan in March, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in San Juan.

Maximum UV Index Levels in San Juan for March

The chart shows the monthly maximum UV Index (UVI) for San Juan in March, 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 March, the maximum UV index in San Juan typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6910111212121211976
Data source: San Juan March 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 March 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 March’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 March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather16°C (62°F)20 mm (0.8 inches)83%high
February Weather18°C (65°F)21 mm (0.8 inches)79%very high
March Weather22°C (72°F)31 mm (1.2 inches)76%very high
April Weather25°C (78°F)31 mm (1.2 inches)77%extreme
May Weather28°C (83°F)87 mm (3.4 inches)80%extreme
June Weather30°C (86°F)81 mm (3.2 inches)73%extreme
July Weather30°C (87°F)100 mm (3.9 inches)66%extreme
August Weather31°C (88°F)22 mm (0.9 inches)65%extreme
September Weather29°C (84°F)96 mm (3.8 inches)73%extreme
October Weather25°C (77°F)51 mm (2.0 inches)76%very high
November Weather20°C (69°F)30 mm (1.2 inches)80%high
December Weather18°C (64°F)21 mm (0.8 inches)86%high

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