Last updated: August 23, 2025
In May, the average temperature in San Isidro, Costa Rica hovers around 23°C (73°F), making it a pleasant time of year. Expect a cozy minimum of 20°C (68°F) and a warmer maximum of 27°C (80°F). However, be prepared for some rain, as the region receives an average precipitation of 742 mm (29.2 in) over 31 days, coupled with an average humidity of 69%.
In May in San Isidro, the average temperature is 23°C (73°F), with maximums reaching up to 27°C (80°F) and minimums dropping as low as 20°C (68°F). This makes it an ideal time for travelers seeking pleasant weather and enjoyable outdoor activities.
In San Isidro in May, the total precipitation amount is 742 mm (29.2 in) over the course of 31 days.
In San Isidro in May humidity is 69%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making it perfect for leisurely strolls but potentially uncomfortable during the peak hours of the day, so travelers should stay hydrated and seek shade when exploring.
In San Isidro in May, 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.
UV Risk Categories
Weather in San Isidro varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Isidro, focusing on differences in temperature, rainfall, humidity, and UV levels.
| 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 |