Last updated: August 27, 2025
In San Juan, Peru, the average temperature in May is a pleasant 26°C (79°F). You can expect temperatures to range from a minimum of 20°C (68°F) to a maximum of 34°C (93°F). This period also sees an average precipitation of 223 mm (8.8 in) spread over 24 days, while the average humidity sits at a humid 89%.
In May in San Juan, the average temperature is 26°C (79°F). Maximums can reach 34°C (93°F) and minimums can be as low as 20°C (68°F). This makes San Juan an ideal destination for travelers seeking warm and pleasant weather during this time.
In San Juan in May, the total precipitation amount is 223 mm (8.8 in) recorded over a span of 24 days.
In San Juan in May, humidity is 89%. With an average temperature of 26°C (79°F), this humidity feels like walking through a warm, thick blanket, making it feel much hotter and more exhausting for traveling, as every step seems to weigh you down in the muggy air.
In San Juan in May, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. 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 May’s weather to other months in San Juan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 26°C (79°F) | 251 mm (9.9 inches) | 84% | extreme |
| February Weather | 26°C (79°F) | 226 mm (8.9 inches) | 82% | extreme |
| March Weather | 26°C (79°F) | 321 mm (12.7 inches) | 84% | extreme |
| April Weather | 26°C (79°F) | 305 mm (12.0 inches) | 87% | extreme |
| May Weather | 26°C (79°F) | 223 mm (8.8 inches) | 89% | extreme |
| June Weather | 25°C (78°F) | 193 mm (7.6 inches) | 82% | extreme |
| July Weather | 25°C (78°F) | 145 mm (5.7 inches) | 69% | extreme |
| August Weather | 26°C (79°F) | 107 mm (4.2 inches) | 58% | extreme |
| September Weather | 26°C (80°F) | 152 mm (6.0 inches) | 56% | extreme |
| October Weather | 26°C (80°F) | 188 mm (7.4 inches) | 62% | extreme |
| November Weather | 26°C (80°F) | 233 mm (9.2 inches) | 77% | extreme |
| December Weather | 26°C (79°F) | 273 mm (10.7 inches) | 88% | extreme |