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April Weather in San Isidro, Costa Rica

Last updated: August 23, 2025

In April, the average temperature in San Isidro, Costa Rica is a comfortable 23°C (73°F), with a pleasant range that dips to a minimum of 19°C (67°F) and peaks at 26°C (79°F). Despite these inviting conditions, expect 350 mm (13.8 in) of precipitation spread over 30 days, contributing to an average humidity of 67%.

April Temperature in San Isidro

In April in San Isidro, the average temperature is 23°C (73°F). The maximum can reach 26°C (79°F), and the minimum can be as low as 19°C (67°F). This mild and pleasant weather makes San Isidro an ideal destination for travelers looking to enjoy outdoor activities.

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

The chart illustrates April 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, April 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 (67°F).
JanFebMarAprMayJunJulAugSepOctNovDec727273737373727272727271
Data source: Temperature data for San Isidro 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.

April Precipitation in San Isidro

In San Isidro in April, the total precipitation amount is 350 mm (13.8 in) over the course of 30 days.

April Precipitation Trends in San Isidro

The chart displays monthly precipitation patterns in San Isidro, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In San Isidro, April typically receives around 350 mm (13.8 inches) of precipitation spread over approximately 30 days.
JanFebMarAprMayJunJulAugSepOctNovDec19499120350742663784838766937885354
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in San Isidro

In San Isidro in April humidity is 67%. With an average temperature of 23°C (73°F), this humidity feels like a warm, enveloping blanket that makes the air feel thick and slightly sticky, which can be challenging for travelers who prefer cooler, drier conditions.

April Average Humidity in San Isidro

This chart illustrates the average monthly humidity levels in San Isidro, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in San Isidro is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec68%68%66%67%69%84%85%82%81%80%80%73%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in San Isidro

In San Isidro in April, 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 April

The chart shows the monthly maximum UV Index (UVI) for San Isidro in April, 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 April, the maximum UV index in San Isidro typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121415151514141414141211
Data source: San Isidro April 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 April 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 April’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 April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather22°C (72°F)194 mm (7.6 inches)68%extreme
February Weather22°C (73°F)99 mm (3.9 inches)68%extreme
March Weather23°C (73°F)120 mm (4.7 inches)66%extreme
April Weather23°C (73°F)350 mm (13.8 inches)67%extreme
May Weather23°C (73°F)742 mm (29.2 inches)69%extreme
June Weather23°C (73°F)663 mm (26.1 inches)84%extreme
July Weather22°C (73°F)784 mm (30.8 inches)85%extreme
August Weather22°C (73°F)838 mm (33.0 inches)82%extreme
September Weather22°C (72°F)766 mm (30.1 inches)81%extreme
October Weather22°C (72°F)937 mm (36.9 inches)80%extreme
November Weather22°C (72°F)885 mm (34.8 inches)80%extreme
December Weather22°C (72°F)354 mm (13.9 inches)72%extreme

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