Last updated: August 28, 2025
In December, the average temperature in San Jose de Mayo, Uruguay is a comfortable 22°C (72°F). Expect minimums as low as 8°C (47°F) and maximums soaring to 36°C (98°F). With an average precipitation of 60 mm (2.3 in) over 8 days, it's advisable to carry an umbrella. The air is moderately humid, with an average humidity of 65%.
In December in San Jose de Mayo, the average temperature is 22°C (72°F). Maximums can reach 36°C (98°F), and minimums can drop as low as 8°C (47°F). Be prepared for a range of temperatures and pack accordingly for your trip!
In San Jose de Mayo in December, the precipitation amount is 60 mm (2.3 in) over a span of 8 days.
In San Jose de Mayo in December, humidity is 65%. With an average temperature of 22°C (72°F), this humidity feels like a warm, tropical embrace that can make outdoor activities quite sticky, yet still enjoyable if you stay hydrated and take breaks in the shade.
In San Jose de Mayo 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 de Mayo, you can check here.
UV Risk Categories
Weather in San Jose de Mayo 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 Mayo, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 24°C (75°F) | 78 mm (3.1 inches) | 63% | extreme |
| February Weather | 23°C (73°F) | 100 mm (3.9 inches) | 69% | extreme |
| March Weather | 21°C (70°F) | 89 mm (3.5 inches) | 73% | extreme |
| April Weather | 18°C (65°F) | 72 mm (2.8 inches) | 79% | high |
| May Weather | 14°C (58°F) | 109 mm (4.3 inches) | 82% | moderate |
| June Weather | 12°C (54°F) | 94 mm (3.7 inches) | 80% | moderate |
| July Weather | 11°C (52°F) | 89 mm (3.5 inches) | 72% | moderate |
| August Weather | 12°C (54°F) | 81 mm (3.2 inches) | 72% | high |
| September Weather | 14°C (58°F) | 83 mm (3.3 inches) | 76% | very high |
| October Weather | 16°C (62°F) | 91 mm (3.6 inches) | 71% | extreme |
| November Weather | 20°C (68°F) | 66 mm (2.6 inches) | 68% | extreme |
| December Weather | 22°C (72°F) | 60 mm (2.3 inches) | 65% | extreme |