Last updated: August 27, 2025
In San Sebastian, Mexico, the average temperature in May hovers around 21°C (70°F), creating a pleasant climate. While the mercury can dip as low as 8°C (47°F), it can also soar to a maximum of 33°C (92°F). Expect about 24 mm (0.9 in) of precipitation spread over 6 days, coupled with an average humidity of 77%, adding a touch of tropical warmth to the air.
In May in San Sebastian, the average temperature is 21°C (70°F), with a maximum reaching 33°C (92°F) and a minimum dropping as low as 8°C (47°F). This makes it an ideal time for travelers who enjoy mild weather and are prepared for a range of temperatures during their stay.
In San Sebastian in May, the total precipitation amount is 24 mm (0.9 in) over a span of 6 days.
In San Sebastian in May, humidity is 77%. With an average temperature of 21°C (70°F), this humidity feels like a warm, slightly sticky embrace, making travel invigorating yet slightly uncomfortable as you navigate the vibrant streets and outdoor attractions.
In San Sebastian 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 Sebastian.
UV Risk Categories
Weather in San Sebastian varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Sebastian, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 14°C (58°F) | 4 mm (0.2 inches) | 84% | very high |
| February Weather | 17°C (62°F) | 2 mm (0.1 inches) | 78% | extreme |
| March Weather | 19°C (66°F) | 8 mm (0.3 inches) | 75% | extreme |
| April Weather | 20°C (69°F) | 15 mm (0.6 inches) | 70% | extreme |
| May Weather | 21°C (70°F) | 24 mm (0.9 inches) | 77% | extreme |
| June Weather | 20°C (68°F) | 96 mm (3.8 inches) | 76% | extreme |
| July Weather | 19°C (66°F) | 93 mm (3.7 inches) | 68% | extreme |
| August Weather | 19°C (66°F) | 116 mm (4.6 inches) | 70% | extreme |
| September Weather | 18°C (65°F) | 123 mm (4.8 inches) | 82% | extreme |
| October Weather | 17°C (63°F) | 56 mm (2.2 inches) | 91% | extreme |
| November Weather | 16°C (60°F) | 15 mm (0.6 inches) | 89% | very high |
| December Weather | 15°C (59°F) | 2 mm (0.1 inches) | 88% | very high |