March Weather in San Isidro, Costa Rica

Last updated: August 23, 2025

In San Isidro, Costa Rica, the average temperature in March hovers around 23°C (73°F), with a pleasant minimum of 19°C (66°F) and a maximum of 26°C (79°F). Expect 120 mm (4.7 in) of precipitation spread over 26 days, contributing to an average humidity level of 66%. Prepare for a mix of warm days and refreshing showers this month!

March Temperature in San Isidro

In March in San Isidro, the average temperature is 23°C (73°F), with maximums reaching 26°C (79°F) and minimums dropping to as low as 19°C (66°F). This pleasant climate makes it an ideal time for outdoor activities and sightseeing adventures.

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

The chart illustrates March temperature patterns in San Isidro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Isidro, March typically has an average temperature of 23°C (73°F), with highs reaching up to 26°C (79°F) and lows dropping to around 19°C (66°F).

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

March Precipitation in San Isidro

In San Isidro, in March, the total amount of precipitation is 120 mm (4.7 in) spread over 26 days.

March Precipitation Trends in San Isidro

The chart displays monthly precipitation patterns in San Isidro, 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 Isidro, March typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 26 days.

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

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Millimeters (mm) Inches (in)

March Humidity in San Isidro

In San Isidro in March, humidity is 66%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making it essential for travelers to stay hydrated and plan outdoor activities for cooler times of the day.

March Average Humidity in San Isidro

This chart illustrates the average monthly humidity levels in San Isidro, 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 Isidro 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 Isidro

In San Isidro 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 Isidro.

Maximum UV Index Levels in San Isidro for March

The chart shows the monthly maximum UV Index (UVI) for San Isidro 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 Isidro typically reaches 15, which falls under the extreme exposure category.

Data source: San Isidro 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 Isidro Compares to Other Months

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

This table compares monthly weather conditions in San Isidro, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	22°C (72°F)	194 mm (7.6 inches)	68%	extreme
February Weather	22°C (73°F)	99 mm (3.9 inches)	68%	extreme
March Weather	23°C (73°F)	120 mm (4.7 inches)	66%	extreme
April Weather	23°C (73°F)	350 mm (13.8 inches)	67%	extreme
May Weather	23°C (73°F)	742 mm (29.2 inches)	69%	extreme
June Weather	23°C (73°F)	663 mm (26.1 inches)	84%	extreme
July Weather	22°C (73°F)	784 mm (30.8 inches)	85%	extreme
August Weather	22°C (73°F)	838 mm (33.0 inches)	82%	extreme
September Weather	22°C (72°F)	766 mm (30.1 inches)	81%	extreme
October Weather	22°C (72°F)	937 mm (36.9 inches)	80%	extreme
November Weather	22°C (72°F)	885 mm (34.8 inches)	80%	extreme
December Weather	22°C (72°F)	354 mm (13.9 inches)	72%	extreme