Last updated: August 31, 2025
In April, the average temperature in San Isidro, Puerto Rico hovers around 26°C (78°F), providing a pleasant climate for outdoor activities. Expect minimum temperatures of 22°C (71°F) and highs reaching 31°C (88°F). The month sees approximately 56 mm (2.2 in) of precipitation spread over 10 days, contributing to an average humidity of 75%. Whether you're seeking adventure or relaxation, the weather offers something for everyone!
In April in San Isidro, the average temperature is 26°C (78°F). Maximums can reach 31°C (88°F), and minimums can drop to as low as 22°C (71°F). This pleasant weather makes San Isidro an ideal destination for travelers looking to enjoy a warm climate.
In San Isidro in April, the precipitation amount is 56 mm (2.2 in) over the course of 10 days.
In San Isidro in April, humidity is 75%. With an average temperature of 26°C (78°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit challenging, as the air can feel heavy and sticky, often leading to a need for frequent breaks to hydrate and find cooler spots to relax.
In San Isidro in April, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in San Isidro.
UV Risk Categories
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.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 25°C (77°F) | 38 mm (1.5 inches) | 76% | very high |
| February Weather | 25°C (77°F) | 43 mm (1.7 inches) | 75% | extreme |
| March Weather | 25°C (77°F) | 67 mm (2.6 inches) | 74% | extreme |
| April Weather | 26°C (78°F) | 56 mm (2.2 inches) | 75% | extreme |
| May Weather | 27°C (80°F) | 64 mm (2.5 inches) | 75% | extreme |
| June Weather | 27°C (81°F) | 68 mm (2.7 inches) | 77% | extreme |
| July Weather | 28°C (82°F) | 87 mm (3.4 inches) | 80% | extreme |
| August Weather | 28°C (82°F) | 99 mm (3.9 inches) | 80% | extreme |
| September Weather | 28°C (82°F) | 173 mm (6.8 inches) | 79% | extreme |
| October Weather | 27°C (81°F) | 145 mm (5.7 inches) | 78% | extreme |
| November Weather | 26°C (80°F) | 106 mm (4.2 inches) | 78% | very high |
| December Weather | 26°C (78°F) | 51 mm (2.0 inches) | 76% | very high |