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April Weather in San Diego, Costa Rica

Last updated: August 23, 2025

In April, the average temperature in San Diego, Costa Rica is a pleasant 19°C (66°F), with a minimum of 13°C (56°F) and a maximum reaching 26°C (80°F). Expect around 113 mm (4.4 in) of precipitation spread over 23 days, contributing to an average humidity level of 67%. Enjoy the mild climate while preparing for occasional showers!

April Temperature in San Diego

In April in San Diego, the average temperature is 19°C (66°F). Maximums can reach 26°C (80°F) and minimums can be as low as 13°C (56°F). This mild climate makes San Diego an ideal destination for outdoor activities and sightseeing during this time of year.

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

The chart illustrates April temperature patterns in San Diego, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Diego, April typically has an average temperature of 19°C (66°F), with highs reaching up to 26°C (80°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec636364666666666666656564
Data source: Temperature data for San Diego 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 Diego

In San Diego in April, the precipitation amount is 113 mm (4.4 in) over the course of 23 days.

April Precipitation Trends in San Diego

The chart displays monthly precipitation patterns in San Diego, 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 Diego, April typically receives around 113 mm (4.4 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec934349113425341266304380517260156
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in San Diego

In San Diego in April humidity is 67%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace that envelops you as you travel, making each step a little heavier but still comfortable enough to explore the vibrant surroundings.

April Average Humidity in San Diego

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

In San Diego in April, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in San Diego.

Maximum UV Index Levels in San Diego for April

The chart shows the monthly maximum UV Index (UVI) for San Diego 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 Diego typically reaches 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121415161414141414151211
Data source: San Diego 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 Diego Compares to Other Months

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

This table compares monthly weather conditions in San Diego, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)93 mm (3.7 inches)68%extreme
February Weather17°C (64°F)43 mm (1.7 inches)68%extreme
March Weather18°C (64°F)49 mm (1.9 inches)66%extreme
April Weather19°C (66°F)113 mm (4.4 inches)67%extreme
May Weather19°C (67°F)425 mm (16.7 inches)69%extreme
June Weather19°C (67°F)341 mm (13.4 inches)84%extreme
July Weather19°C (66°F)266 mm (10.5 inches)85%extreme
August Weather19°C (66°F)304 mm (12.0 inches)82%extreme
September Weather19°C (66°F)379 mm (14.9 inches)81%extreme
October Weather19°C (66°F)517 mm (20.4 inches)80%extreme
November Weather18°C (65°F)260 mm (10.3 inches)80%extreme
December Weather18°C (64°F)156 mm (6.1 inches)72%extreme

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