Last updated: August 27, 2025
In December, the average temperature in San Jose de Guaymas, Mexico is a comfortable 18°C (66°F). Be prepared for a range in temperatures, as it can dip to a minimum of 7°C (45°F) and peak at 29°C (85°F). With an average humidity of 72%, you'll likely experience a moderate level of moisture in the air. Plus, expect about 8 mm (0.3 in) of precipitation over just 1 day, so a light raincoat might come in handy!
In December in San Jose de Guaymas, the average temperature is 18°C (66°F). The maximum can reach 29°C (85°F) and the minimum can be as low as 7°C (45°F). This makes it an ideal time for travelers to enjoy a variety of outdoor activities while being prepared for both warm and cooler weather.
In San Jose de Guaymas in December, the precipitation amount is 8 mm (0.3 in) over the course of 1 day.
In San Jose de Guaymas in December, humidity is 72%. With an average temperature of 18°C (66°F), this humidity feels like a warm, sticky blanket enveloping you, making outdoor activities a bit more strenuous and prompting you to seek shade or a cool breeze while exploring the area.
In San Jose de Guaymas in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in San Jose de Guaymas.
UV Risk Categories
Weather in San Jose de Guaymas varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Jose de Guaymas, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 17°C (64°F) | 12 mm (0.5 inches) | 71% | moderate |
| February Weather | 18°C (65°F) | 8 mm (0.3 inches) | 66% | very high |
| March Weather | 20°C (68°F) | 12 mm (0.5 inches) | 58% | very high |
| April Weather | 23°C (74°F) | 0 mm (0.0 inches) | 52% | extreme |
| May Weather | 26°C (79°F) | 0 mm (0.0 inches) | 51% | extreme |
| June Weather | 30°C (86°F) | 5 mm (0.2 inches) | 51% | extreme |
| July Weather | 32°C (90°F) | 7 mm (0.3 inches) | 60% | extreme |
| August Weather | 32°C (90°F) | 19 mm (0.7 inches) | 73% | extreme |
| September Weather | 30°C (87°F) | 53 mm (2.1 inches) | 76% | extreme |
| October Weather | 27°C (82°F) | 17 mm (0.7 inches) | 72% | very high |
| November Weather | 23°C (73°F) | 10 mm (0.4 inches) | 72% | high |
| December Weather | 18°C (66°F) | 8 mm (0.3 inches) | 72% | moderate |