Last updated: June 24, 2025
In December, the average temperature in Bellevue, United States hovers around 2°C (35°F). Be prepared for a range of temperatures, as it can dip to a chilly -21°C (-5°F) or rise to a comfortable 17°C (62°F). Expect approximately 76 mm (3.0 in) of precipitation over 12 days, contributing to an average humidity of 86%.
In December in Bellevue, the average temperature is 2°C (35°F), with maximums reaching 17°C (62°F) and minimums dropping as low as -21°C (-5°F). This wide temperature range suggests that visitors should be well-prepared for both chilly and mild weather conditions during their travels.
In Bellevue in December, the total precipitation amount is 76 mm (3.0 in), occurring over the course of 12 days.
In Bellevue in December humidity is 86%. With an average temperature of 2°C (35°F), this humidity feels like a damp chill that seeps into your bones, making traveling quite uncomfortable as your clothes cling to you and the cold air cuts through any warmth you try to find.
In Bellevue 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 Bellevue, you can visit Hourly UV Index in Bellevue.
UV Risk Categories
Weather in Bellevue varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Bellevue, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (30°F) | 76 mm (3.0 inches) | 88% | moderate |
| February Weather | 0°C (32°F) | 87 mm (3.4 inches) | 87% | moderate |
| March Weather | 4°C (40°F) | 92 mm (3.6 inches) | 87% | high |
| April Weather | 10°C (49°F) | 111 mm (4.4 inches) | 87% | very high |
| May Weather | 16°C (61°F) | 125 mm (4.9 inches) | 81% | very high |
| June Weather | 21°C (71°F) | 119 mm (4.7 inches) | 82% | very high |
| July Weather | 24°C (75°F) | 124 mm (4.9 inches) | 81% | very high |
| August Weather | 23°C (73°F) | 83 mm (3.3 inches) | 78% | very high |
| September Weather | 20°C (68°F) | 75 mm (2.9 inches) | 78% | very high |
| October Weather | 14°C (57°F) | 98 mm (3.9 inches) | 82% | high |
| November Weather | 5°C (42°F) | 93 mm (3.7 inches) | 89% | moderate |
| December Weather | 2°C (35°F) | 76 mm (3.0 inches) | 86% | low |