Last updated: August 27, 2025
In San Sebastian, Mexico, the average temperature in December is 17°C (63°F). Expect a minimum of 5°C (42°F) and a pleasant maximum of 27°C (82°F). During this time, precipitation is typically around 7 mm (0.3 in), occurring on about 1 day. The average humidity sits at a comfortable 76%, making it a delightful month to experience the local climate!
In December in San Sebastian, the average temperature is 17°C (63°F). The maximum can reach 27°C (82°F) and the minimum can be as low as 5°C (42°F). This makes it an ideal time for travelers to enjoy a comfortable climate while exploring the attractions in San Sebastian.
In San Sebastian in December, the precipitation amount is 7 mm (0.3 in) over the course of 1 day.
In San Sebastian in December humidity is 76%. With an average temperature of 17°C (63°F), this humidity feels like traveling through a warm, enveloping blanket, making every outdoor adventure feel sticky and heavy, yet pleasantly refreshing when you find a cool breeze.
In San Sebastian in December, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 December’s weather to other months in San Sebastian, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 17°C (63°F) | 13 mm (0.5 inches) | 70% | very high |
| February Weather | 19°C (66°F) | 13 mm (0.5 inches) | 65% | extreme |
| March Weather | 21°C (70°F) | 12 mm (0.5 inches) | 59% | extreme |
| April Weather | 22°C (72°F) | 3 mm (0.1 inches) | 60% | extreme |
| May Weather | 23°C (74°F) | 83 mm (3.3 inches) | 67% | extreme |
| June Weather | 21°C (70°F) | 383 mm (15.1 inches) | 80% | extreme |
| July Weather | 20°C (69°F) | 480 mm (18.9 inches) | 81% | extreme |
| August Weather | 20°C (69°F) | 557 mm (21.9 inches) | 83% | extreme |
| September Weather | 20°C (68°F) | 502 mm (19.8 inches) | 83% | extreme |
| October Weather | 20°C (68°F) | 266 mm (10.5 inches) | 80% | extreme |
| November Weather | 18°C (66°F) | 66 mm (2.6 inches) | 77% | very high |
| December Weather | 17°C (63°F) | 7 mm (0.3 inches) | 76% | very high |