Last updated: June 24, 2025
In December, the average temperature in Montevideo, United States hovers around -5°C (24°F). While you might experience chilly lows of -25°C (-13°F), the occasional highs can reach up to 13°C (56°F). Expect 38 mm (1.5 in) of precipitation spread over 6 days, contributing to an average humidity of 84%. Bundle up and be prepared for the winter weather!
In December in Montevideo, the average temperature is -5°C (24°F). The maximum can reach 13°C (56°F), while the minimum can drop as low as -25°C (-13°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack appropriately for both chilly nights and potentially milder days.
In Montevideo in December, the total precipitation amount is 38 mm (1.5 in) spread over 6 days.
In Montevideo in December, humidity is 84%. With an average temperature of -5°C (24°F), this humidity feels like an icy blanket wrapped around you, making the air feel even colder and more biting, which can be quite uncomfortable for traveling.
In Montevideo in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Montevideo, you can visit Hourly UV Index in Montevideo.
UV Risk Categories
Weather in Montevideo varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Montevideo, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -9°C (15°F) | 20 mm (0.8 inches) | 85% | moderate |
| February Weather | -9°C (15°F) | 20 mm (0.8 inches) | 89% | moderate |
| March Weather | 0°C (32°F) | 53 mm (2.1 inches) | 81% | moderate |
| April Weather | 6°C (43°F) | 69 mm (2.7 inches) | 82% | high |
| May Weather | 15°C (59°F) | 101 mm (4.0 inches) | 76% | very high |
| June Weather | 22°C (72°F) | 82 mm (3.2 inches) | 81% | very high |
| July Weather | 23°C (74°F) | 102 mm (4.0 inches) | 82% | very high |
| August Weather | 21°C (71°F) | 133 mm (5.2 inches) | 83% | very high |
| September Weather | 18°C (64°F) | 95 mm (3.8 inches) | 82% | high |
| October Weather | 9°C (48°F) | 89 mm (3.5 inches) | 82% | moderate |
| November Weather | 1°C (34°F) | 26 mm (1.0 inches) | 87% | moderate |
| December Weather | -5°C (24°F) | 38 mm (1.5 inches) | 84% | low |