Last updated: August 22, 2025
In December, the average temperature in San Jose, Argentina is a warm 26°C (79°F), with minimums dipping to 12°C (54°F) and peak highs soaring to 39°C (102°F). Visitors can expect 93 mm (3.7 in) of precipitation spread over 9 days, contributing to an average humidity level of 84%. Stay prepared for a mix of warm weather and occasional rain!
In December in San Jose, the average temperature is 26°C (79°F). The maximum can reach 39°C (102°F) and the minimum can be as low as 12°C (54°F). Be prepared for a warm climate, with occasional cool evenings, making it an ideal time for both outdoor activities and relaxation.
In San Jose in December, the precipitation amount is 93 mm (3.7 in) over the course of 9 days.
In San Jose in December, humidity is 84%. With an average temperature of 26°C (79°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel sticky and exhausting, yet the vibrant atmosphere and lush surroundings offer a refreshing allure that invites exploration.
In San Jose in December, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Jose, you can check here.
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 | 27°C (80°F) | 168 mm (6.6 inches) | 77% | extreme |
| February Weather | 26°C (78°F) | 106 mm (4.2 inches) | 71% | extreme |
| March Weather | 24°C (76°F) | 135 mm (5.3 inches) | 74% | extreme |
| April Weather | 21°C (71°F) | 123 mm (4.8 inches) | 82% | very high |
| May Weather | 18°C (64°F) | 197 mm (7.8 inches) | 82% | high |
| June Weather | 16°C (62°F) | 99 mm (3.9 inches) | 73% | moderate |
| July Weather | 16°C (60°F) | 96 mm (3.8 inches) | 67% | high |
| August Weather | 17°C (63°F) | 80 mm (3.2 inches) | 49% | high |
| September Weather | 20°C (68°F) | 103 mm (4.1 inches) | 54% | very high |
| October Weather | 22°C (72°F) | 152 mm (6.0 inches) | 58% | extreme |
| November Weather | 24°C (75°F) | 143 mm (5.6 inches) | 69% | extreme |
| December Weather | 26°C (79°F) | 93 mm (3.7 inches) | 84% | extreme |