Last updated: August 27, 2025
In December, the average temperature in San Julian, Mexico is a pleasant 15°C (59°F). However, temperatures can dip as low as 1°C (34°F) or soar to a maximum of 27°C (80°F). Prepare for a bit of rain, as you can expect around 7 mm (0.3 in) of precipitation over the course of one day, and don't forget to account for the average humidity of 81% which adds to the overall comfort and atmosphere of the season.
In December in San Julian, the average temperature is 15°C (59°F), with maximum temperatures reaching 27°C (80°F) and minimums dropping as low as 1°C (34°F). This moderate climate makes San Julian an ideal destination for travelers looking to enjoy outdoor activities and pleasant sightseeing.
In San Julian in December, the precipitation amount is 7 mm (0.3 in) over the course of 1 day.
In San Julian in December humidity is 81%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket draped over you, making traveling quite uncomfortable as you constantly wipe away beads of sweat and feel the stickiness clinging to your clothes.
In San Julian 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 Julian.
UV Risk Categories
Weather in San Julian varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Julian, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 15°C (59°F) | 12 mm (0.5 inches) | 74% | very high |
| February Weather | 17°C (63°F) | 13 mm (0.5 inches) | 65% | extreme |
| March Weather | 20°C (69°F) | 7 mm (0.3 inches) | 58% | extreme |
| April Weather | 22°C (72°F) | 3 mm (0.1 inches) | 58% | extreme |
| May Weather | 23°C (74°F) | 30 mm (1.2 inches) | 67% | extreme |
| June Weather | 22°C (71°F) | 156 mm (6.2 inches) | 76% | extreme |
| July Weather | 20°C (67°F) | 219 mm (8.6 inches) | 67% | extreme |
| August Weather | 20°C (68°F) | 178 mm (7.0 inches) | 68% | extreme |
| September Weather | 19°C (67°F) | 195 mm (7.7 inches) | 81% | extreme |
| October Weather | 19°C (66°F) | 71 mm (2.8 inches) | 83% | extreme |
| November Weather | 17°C (62°F) | 20 mm (0.8 inches) | 84% | very high |
| December Weather | 15°C (59°F) | 7 mm (0.3 inches) | 81% | very high |