Last updated: August 27, 2025
In August, the average temperature in San Juan, Mexico is a warm 31°C (89°F), with a comfortable minimum of 23°C (73°F) and a scorching maximum of 41°C (107°F). Expect 16 mm (0.6 in) of precipitation spread over about 4 days, and enjoy an average humidity level of 67% that adds a touch of warmth to these sunny days.
In August in San Juan, the average temperature is 31°C (89°F), with maximums that can reach 41°C (107°F) and minimums that can dip as low as 23°C (73°F). Be prepared for hot weather and stay hydrated while exploring!
In San Juan in August, the precipitation amount is 16 mm (0.6 in) over a span of 4 days.
In San Juan in August humidity is 67%. With an average temperature of 31°C (89°F), this humidity feels like a warm blanket wrapping around you, making travel feel more intense and often leaving you in need of frequent breaks to hydrate and find refuge in the shade.
In San Juan in August, 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 August’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 (61°F) | 20 mm (0.8 inches) | 84% | high |
| February Weather | 18°C (65°F) | 13 mm (0.5 inches) | 83% | very high |
| March Weather | 23°C (73°F) | 25 mm (1.0 inches) | 78% | very high |
| April Weather | 25°C (78°F) | 46 mm (1.8 inches) | 81% | extreme |
| May Weather | 28°C (83°F) | 86 mm (3.4 inches) | 82% | extreme |
| June Weather | 30°C (86°F) | 86 mm (3.4 inches) | 74% | extreme |
| July Weather | 31°C (87°F) | 78 mm (3.1 inches) | 68% | extreme |
| August Weather | 31°C (89°F) | 16 mm (0.6 inches) | 67% | extreme |
| September Weather | 28°C (83°F) | 119 mm (4.7 inches) | 75% | extreme |
| October Weather | 24°C (76°F) | 56 mm (2.2 inches) | 78% | very high |
| November Weather | 20°C (68°F) | 23 mm (0.9 inches) | 83% | high |
| December Weather | 17°C (64°F) | 20 mm (0.8 inches) | 86% | high |