Last updated: August 27, 2025
In December, the average temperature in San Jose, Mexico is a pleasant 21°C (69°F), making it an inviting destination. Expect minimums of 9°C (49°F) and maximums rising to 31°C (89°F), giving you a taste of a warm climate. During this time, anticipate 14 mm (0.5 in) of precipitation spread over just 3 days, and enjoy a comfortable average humidity of 70%. Plan accordingly to make the most of your visit!
In December in San Jose, the average temperature is a pleasant 21°C (69°F). Maximum temperatures can reach up to 31°C (89°F), while minimums can drop to as low as 9°C (49°F). This makes San Jose an ideal destination for travelers looking to enjoy mild to warm weather, perfect for outdoor activities and exploration.
In San Jose in December, the precipitation amount is 14 mm (0.5 in) over the course of 3 days.
In San Jose in December, humidity is 70%. With an average temperature of 21°C (69°F), this humidity feels like a warm blanket that envelops you as you travel, making you feel sticky and a bit lethargic, yet it adds a certain tropical charm to your adventures.
In San Jose in December, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in San Jose.
UV Risk Categories
Weather in San Jose varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Jose, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 21°C (70°F) | 8 mm (0.3 inches) | 65% | very high |
| February Weather | 22°C (71°F) | 3 mm (0.1 inches) | 61% | extreme |
| March Weather | 23°C (73°F) | 14 mm (0.5 inches) | 59% | extreme |
| April Weather | 24°C (75°F) | 22 mm (0.9 inches) | 62% | extreme |
| May Weather | 24°C (75°F) | 133 mm (5.2 inches) | 73% | extreme |
| June Weather | 22°C (72°F) | 327 mm (12.9 inches) | 78% | extreme |
| July Weather | 22°C (72°F) | 256 mm (10.1 inches) | 79% | extreme |
| August Weather | 22°C (71°F) | 381 mm (15.0 inches) | 82% | extreme |
| September Weather | 22°C (71°F) | 405 mm (16.0 inches) | 82% | extreme |
| October Weather | 22°C (71°F) | 236 mm (9.3 inches) | 79% | extreme |
| November Weather | 21°C (71°F) | 36 mm (1.4 inches) | 72% | very high |
| December Weather | 21°C (69°F) | 14 mm (0.5 inches) | 70% | very high |