Last updated: August 27, 2025
In San Martin, Mexico, the average temperature in December hovers around 11°C (52°F). Expect a chilly minimum of -9°C (17°F) and a warm maximum of 25°C (78°F). During this month, precipitation is light, with only 9 mm (0.4 in) falling over 2 days. Additionally, you'll experience a high average humidity of 83%, making for a rather damp atmosphere.
In December, in San Martin, the average temperature is 11°C (52°F), with maximums reaching up to 25°C (78°F) and minimums dropping as low as -9°C (17°F). This diverse temperature range makes San Martin a unique destination for travelers prepared for both warmer and cooler experiences.
In San Martin in December, the precipitation amount is 9 mm (0.4 in) over the course of 2 days.
In San Martin in December humidity is 83%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that can make outdoor activities uncomfortable, often leading travelers to seek shelter indoors or to dress in layered clothing to stay warm while exploring the area.
In San Martin 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 Martin.
UV Risk Categories
Weather in San Martin varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Martin, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 10°C (51°F) | 15 mm (0.6 inches) | 71% | very high |
| February Weather | 13°C (55°F) | 11 mm (0.4 inches) | 64% | extreme |
| March Weather | 16°C (61°F) | 11 mm (0.4 inches) | 49% | extreme |
| April Weather | 18°C (64°F) | 4 mm (0.2 inches) | 47% | extreme |
| May Weather | 20°C (68°F) | 19 mm (0.7 inches) | 55% | extreme |
| June Weather | 21°C (70°F) | 71 mm (2.8 inches) | 77% | extreme |
| July Weather | 18°C (65°F) | 180 mm (7.1 inches) | 82% | extreme |
| August Weather | 19°C (66°F) | 86 mm (3.4 inches) | 83% | extreme |
| September Weather | 17°C (62°F) | 149 mm (5.9 inches) | 86% | extreme |
| October Weather | 16°C (61°F) | 48 mm (1.9 inches) | 83% | extreme |
| November Weather | 13°C (56°F) | 17 mm (0.7 inches) | 80% | very high |
| December Weather | 11°C (52°F) | 9 mm (0.4 inches) | 83% | very high |