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March Weather in San Juan, Mexico

Last updated: August 27, 2025

In March, the average temperature in San Juan, Mexico is a comfortable 23°C (73°F). However, be prepared for fluctuations, as temperatures can range from a cool 5°C (41°F) to a scorching 40°C (104°F). Expect about 25 mm (1.0 in) of precipitation over 5 days, contributing to an average humidity of 78%. Whether you're exploring or relaxing, the weather keeps you on your toes!

March Temperature in San Juan

In March in San Juan, the average temperature is 23°C (73°F). The maximum can reach 40°C (104°F), while the minimum can drop as low as 5°C (41°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack accordingly.

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 23°C (73°F), with highs reaching up to 40°C (104°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec616573788386878882766863
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 total precipitation amount is 25 mm (1.0 in) over a span of 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 25 mm (1.0 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec2014254686867816119562320
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 78%. With an average temperature of 23°C (73°F), this humidity feels like a warm, sticky embrace, making outdoor activities a little challenging but still enjoyable for travelers who appreciate a tropical atmosphere.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%78%81%82%74%68%67%75%78%83%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.
JanFebMarAprMayJunJulAugSepOctNovDec68101212121212111076
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 (61°F)20 mm (0.8 inches)84%high
February Weather18°C (65°F)13 mm (0.5 inches)83%very high
March Weather23°C (73°F)25 mm (1.0 inches)78%very high
April Weather25°C (78°F)46 mm (1.8 inches)81%extreme
May Weather28°C (83°F)86 mm (3.4 inches)82%extreme
June Weather30°C (86°F)86 mm (3.4 inches)74%extreme
July Weather31°C (87°F)78 mm (3.1 inches)68%extreme
August Weather31°C (89°F)16 mm (0.6 inches)67%extreme
September Weather28°C (83°F)119 mm (4.7 inches)75%extreme
October Weather24°C (76°F)56 mm (2.2 inches)78%very high
November Weather20°C (68°F)23 mm (0.9 inches)83%high
December Weather17°C (64°F)20 mm (0.8 inches)86%high

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