Last updated: June 24, 2025
In San Juan, United States, the average temperature in June reaches a warm 30°C (86°F), with a minimum of 18°C (65°F) and a soaring maximum of 42°C (109°F). Expect 81 mm (3.2 in) of precipitation over about 11 days, accompanied by an average humidity of 73%, creating a warm and often muggy atmosphere. Prepare accordingly for the varying climate!
In June in San Juan, the average temperature is 30°C (86°F). Maximums can reach 42°C (109°F), while minimums can drop as low as 18°C (65°F). Be prepared for hot days and cooler evenings when traveling during this time.
In San Juan in June, the precipitation amount is 81 mm (3.2 in) over a span of 11 days.
In San Juan in June, humidity is 73%. With an average temperature of 30°C (86°F), this humidity feels like a thick blanket enveloping you, making travel somewhat oppressive as you navigate the streets, prompting frequent breaks for hydration and shade.
In San Juan in June, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in San Juan.
UV Risk Categories
Weather in San Juan varies notably across the year, with each month offering distinct climate conditions. This page compares June’s weather to other months in San Juan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 16°C (62°F) | 20 mm (0.8 inches) | 83% | high |
| February Weather | 18°C (65°F) | 21 mm (0.8 inches) | 79% | very high |
| March Weather | 22°C (72°F) | 31 mm (1.2 inches) | 76% | very high |
| April Weather | 25°C (78°F) | 31 mm (1.2 inches) | 77% | extreme |
| May Weather | 28°C (83°F) | 87 mm (3.4 inches) | 80% | extreme |
| June Weather | 30°C (86°F) | 81 mm (3.2 inches) | 73% | extreme |
| July Weather | 30°C (87°F) | 100 mm (3.9 inches) | 66% | extreme |
| August Weather | 31°C (88°F) | 22 mm (0.9 inches) | 65% | extreme |
| September Weather | 29°C (84°F) | 96 mm (3.8 inches) | 73% | extreme |
| October Weather | 25°C (77°F) | 51 mm (2.0 inches) | 76% | very high |
| November Weather | 20°C (69°F) | 30 mm (1.2 inches) | 80% | high |
| December Weather | 18°C (64°F) | 21 mm (0.8 inches) | 86% | high |