Last updated: August 26, 2025
In December, the average temperature in San Juan Capistrano, Mexico hovers around 15°C (58°F), offering a pleasant climate. Minimums can dip to -3°C (28°F), while maximums may reach up to 28°C (83°F), showcasing a wide range of weather conditions. With a total precipitation amount of 12 mm (0.5 in) expected over the course of 2 days, and an average humidity level of 83%, it's ideal to come prepared for both warmth and wetness in your travels!
In December in San Juan Capistrano, the average temperature is 15°C (58°F), with maximums reaching up to 28°C (83°F) and minimums dropping as low as -3°C (28°F). Be prepared for a wide range of temperatures to make the most of your travel experience.
In San Juan Capistrano in December, the precipitation amount is 12 mm (0.5 in) over the course of 2 days.
In San Juan Capistrano in December, humidity is 83%. With an average temperature of 15°C (58°F), this humidity feels like a warm blanket enveloping you, making outdoor activities sticky and uncomfortable for traveling.
In San Juan Capistrano 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 Juan Capistrano.
UV Risk Categories
Weather in San Juan Capistrano varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Juan Capistrano, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 14°C (58°F) | 16 mm (0.6 inches) | 71% | very high |
| February Weather | 16°C (61°F) | 16 mm (0.6 inches) | 64% | extreme |
| March Weather | 19°C (66°F) | 4 mm (0.2 inches) | 49% | extreme |
| April Weather | 20°C (69°F) | 1 mm (0.0 inches) | 47% | extreme |
| May Weather | 23°C (73°F) | 9 mm (0.4 inches) | 55% | extreme |
| June Weather | 23°C (74°F) | 45 mm (1.8 inches) | 77% | extreme |
| July Weather | 21°C (71°F) | 128 mm (5.0 inches) | 82% | extreme |
| August Weather | 22°C (72°F) | 81 mm (3.2 inches) | 83% | extreme |
| September Weather | 21°C (70°F) | 81 mm (3.2 inches) | 86% | extreme |
| October Weather | 20°C (69°F) | 44 mm (1.7 inches) | 83% | extreme |
| November Weather | 17°C (64°F) | 14 mm (0.6 inches) | 80% | very high |
| December Weather | 15°C (58°F) | 12 mm (0.5 inches) | 83% | very high |