Last updated: August 27, 2025
In May, the average temperature in San Salvador, Mexico hovers around 21°C (70°F), creating a pleasantly mild atmosphere. Expect minimum temperatures to drop to 8°C (47°F), while the mercury can rise to a warm 34°C (93°F). The month brings about 37 mm (1.5 in) of precipitation, typically spread over 10 days, with an average humidity of a humid 82%.
In May in San Salvador, the average temperature is 21°C (70°F). Maximums can reach 34°C (93°F), and minimums can be as low as 8°C (47°F). This climate makes San Salvador an ideal destination for travelers seeking pleasant weather and a mix of warm and cooler days.
In San Salvador in May, the precipitation amount is 37 mm (1.5 in) spread over a duration of 10 days.
In San Salvador in May, humidity is 82%. With an average temperature of 21°C (70°F), this humidity feels like a warm, sticky embrace that can quickly lead to discomfort for travelers, making outdoor activities less enjoyable and requiring frequent breaks for hydration.
In San Salvador in May, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in San Salvador.
UV Risk Categories
Weather in San Salvador varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Salvador, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 13°C (56°F) | 8 mm (0.3 inches) | 88% | very high |
| February Weather | 16°C (60°F) | 7 mm (0.3 inches) | 86% | extreme |
| March Weather | 18°C (64°F) | 15 mm (0.6 inches) | 83% | extreme |
| April Weather | 20°C (68°F) | 22 mm (0.9 inches) | 80% | extreme |
| May Weather | 21°C (70°F) | 37 mm (1.5 inches) | 82% | extreme |
| June Weather | 19°C (67°F) | 116 mm (4.6 inches) | 79% | extreme |
| July Weather | 18°C (65°F) | 109 mm (4.3 inches) | 72% | extreme |
| August Weather | 18°C (65°F) | 114 mm (4.5 inches) | 74% | extreme |
| September Weather | 18°C (64°F) | 132 mm (5.2 inches) | 84% | extreme |
| October Weather | 17°C (62°F) | 77 mm (3.0 inches) | 92% | extreme |
| November Weather | 15°C (59°F) | 18 mm (0.7 inches) | 91% | very high |
| December Weather | 14°C (57°F) | 4 mm (0.1 inches) | 91% | very high |