Last updated: March 2, 2024
The weather in San Isidro, Puerto Rico, during January is characterized by an average temperature of 25°C (77°F). Highs can soar to 29°C (84°F), while lows may dip to 22°C (71°F). Typically, the humidity level in San Isidro throughout January hovers around 76%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In January, San Isidro averages 38 mm (1.5 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 11 hours 9 minutes of daylight, with the sun shining for approximately 8 hours 17 minutes each day. Additionally, there is a 51% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In January, the UV Index in San Isidro reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 15 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 | 1 | 1 | 3 | 5 | 7 | 9 | 9 | 8 | 5 | 3 | 1 | 1 | 0 |
| Exposure | Low | Moderate | High | VeryHigh | Moderate | Low | |||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 30 min | 45 min | |||||||