Last updated: August 27, 2025
In December, the average temperature in Santa Monica, Mexico hovers around 16°C (61°F). However, be prepared for temperature fluctuations, as the minimum can drop to -1°C (31°F), while the maximum can rise up to 31°C (89°F). Expect about 11 mm (0.4 in) of precipitation over the course of a single day, complemented by an average humidity level of 84%.
In December in Santa Monica, the average temperature is 16°C (61°F). Maximum temperatures can reach 31°C (89°F), while minimums can drop as low as -1°C (31°F). Be prepared for a wide range of temperatures when traveling during this time!
In Santa Monica in December, the precipitation amount is 11 mm (0.4 in) over the course of one day.
In Santa Monica in December, humidity is 84%. With an average temperature of 16°C (61°F), this humidity feels like a blanket of warmth, making travel slightly sticky but overall comfortable, as long as you stay hydrated and take breaks in the shade.
In Santa Monica in December, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Santa Monica.
UV Risk Categories
Weather in Santa Monica varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Santa Monica, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 15°C (60°F) | 4 mm (0.2 inches) | 70% | high |
| February Weather | 19°C (66°F) | 5 mm (0.2 inches) | 62% | very high |
| March Weather | 22°C (72°F) | 6 mm (0.3 inches) | 53% | extreme |
| April Weather | 26°C (79°F) | 1 mm (0.0 inches) | 48% | extreme |
| May Weather | 29°C (85°F) | 4 mm (0.2 inches) | 52% | extreme |
| June Weather | 30°C (87°F) | 14 mm (0.5 inches) | 64% | extreme |
| July Weather | 29°C (85°F) | 23 mm (0.9 inches) | 73% | extreme |
| August Weather | 30°C (86°F) | 13 mm (0.5 inches) | 71% | extreme |
| September Weather | 27°C (81°F) | 37 mm (1.4 inches) | 82% | extreme |
| October Weather | 24°C (76°F) | 28 mm (1.1 inches) | 83% | extreme |
| November Weather | 19°C (67°F) | 6 mm (0.2 inches) | 82% | very high |
| December Weather | 16°C (61°F) | 11 mm (0.4 inches) | 84% | high |