Last updated: August 27, 2025
In July, the average temperature in San Juan, Peru hovers around 6°C (43°F). Expect chilly nights with a minimum dropping to -8°C (19°F), while daytime highs can reach up to 18°C (65°F). Prepare for some moisture, as the area typically sees 41 mm (1.6 in) of precipitation spread across 8 days. Don't forget to factor in an average humidity of 53% as you plan your activities!
In July in San Juan, the average temperature is 6°C (43°F). The maximum can reach 18°C (65°F), while the minimum can drop to as low as -8°C (19°F). Be prepared for a mix of mild days and chilly nights when traveling during this time.
In San Juan in July, the total precipitation amount is 41 mm (1.6 in) occurring over the course of 8 days.
In San Juan in July, humidity is 53%. With an average temperature of 6°C (43°F), this humidity feels like a crisp, invigorating chill that can make exploring outdoors refreshing yet slightly uncomfortable, requiring warm layers and occasional breaks to warm up.
In San Juan in July, 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 July’s weather to other months in San Juan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 8°C (47°F) | 254 mm (10.0 inches) | 89% | extreme |
| February Weather | 8°C (47°F) | 268 mm (10.6 inches) | 90% | extreme |
| March Weather | 8°C (47°F) | 323 mm (12.7 inches) | 90% | extreme |
| April Weather | 7°C (46°F) | 142 mm (5.6 inches) | 90% | extreme |
| May Weather | 6°C (44°F) | 72 mm (2.8 inches) | 84% | extreme |
| June Weather | 6°C (43°F) | 49 mm (1.9 inches) | 67% | extreme |
| July Weather | 6°C (43°F) | 41 mm (1.6 inches) | 53% | extreme |
| August Weather | 6°C (44°F) | 35 mm (1.4 inches) | 47% | extreme |
| September Weather | 7°C (46°F) | 93 mm (3.7 inches) | 53% | extreme |
| October Weather | 8°C (46°F) | 106 mm (4.2 inches) | 67% | extreme |
| November Weather | 8°C (47°F) | 83 mm (3.3 inches) | 75% | extreme |
| December Weather | 8°C (47°F) | 146 mm (5.7 inches) | 82% | extreme |