March Weather in San Juan, Costa Rica

Last updated: August 23, 2025

In March, the average temperature in San Juan, Costa Rica hovers around 21°C (70°F). Expect a minimum of 14°C (57°F) and a pleasant maximum of 28°C (83°F). You'll likely encounter about 15 mm (0.6 in) of precipitation over 4 days, while the average humidity rests at a comfortable 66%.

March Temperature in San Juan

In March in San Juan, the average temperature is 21°C (70°F). The maximum can reach 28°C (83°F) and the minimum can be as low as 14°C (57°F). This mild weather makes San Juan an ideal destination for comfortable travel and outdoor adventures.

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 21°C (70°F), with highs reaching up to 28°C (83°F) and lows dropping to around 14°C (57°F).

Data source: Temperature data for San Juan generated using information from the Copernicus Climate Change Service.

March Precipitation in San Juan

In San Juan in March, the precipitation amount is 15 mm (0.6 in) occurring over the course of 4 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 15 mm (0.6 inches) of precipitation spread over approximately 4 days.

Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

March Humidity in San Juan

In San Juan in March humidity is 66%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making it comfortable for leisurely strolls but slightly sticky for longer excursions.

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 66%, offering insight into how humid the weather typically is during this month.

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 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 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 15, which falls under the extreme exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	20°C (68°F)	32 mm (1.3 inches)	68%	extreme
February Weather	20°C (69°F)	13 mm (0.5 inches)	68%	extreme
March Weather	21°C (70°F)	15 mm (0.6 inches)	66%	extreme
April Weather	21°C (70°F)	79 mm (3.1 inches)	67%	extreme
May Weather	21°C (70°F)	391 mm (15.4 inches)	69%	extreme
June Weather	21°C (70°F)	351 mm (13.8 inches)	84%	extreme
July Weather	21°C (69°F)	233 mm (9.2 inches)	85%	extreme
August Weather	20°C (69°F)	331 mm (13.0 inches)	82%	extreme
September Weather	20°C (69°F)	436 mm (17.2 inches)	81%	extreme
October Weather	20°C (68°F)	570 mm (22.4 inches)	80%	extreme
November Weather	20°C (68°F)	209 mm (8.2 inches)	80%	extreme
December Weather	20°C (68°F)	63 mm (2.5 inches)	72%	very high