Last updated: March 2, 2024
The weather in San Juan, Costa Rica, during May is characterized by an average temperature of 19°C (67°F). Highs can soar to 25°C (77°F), while lows may dip to 15°C (60°F). Typically, the humidity level in San Juan throughout May hovers around 69%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In May, San Juan averages 425 mm (16.7 inches) of rainfall, typically over the course of 29 rainy days. The month enjoys an average of 12 hours 34 minutes of daylight, with the sun shining for approximately 8 hours 0 minutes each day. Additionally, there is a 12% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In May, the UV Index in San Juan reaches a maximum of 14, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 11:00 and 13:00, during which unprotected skin may burn in as little as 10 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 2 | 5 | 9 | 12 | 14 | 14 | 12 | 8 | 5 | 2 | 1 | 0 | 0 |
| Exposure | Low | Moderate | VeryHigh | Extreme | VeryHigh | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 15 min | 10 min | 15 min | 30 min | 45 min | ||||||