Last updated: June 24, 2025
In Mountain View, United States, the average temperature in December hovers around 7°C (45°F), with a temperature range from a chilly -9°C (16°F) to a warm 24°C (75°F). Expect a precipitation amount of 116 mm (4.6 in) spread over 9 days, and be prepared for high humidity levels at 87%.
In December in Mountain View, the average temperature is 7°C (45°F). Maximums can reach 24°C (75°F), while minimums can drop as low as -9°C (16°F). Be prepared for a wide range of temperatures during your travels!
In Mountain View in December, the precipitation amount is 116 mm (4.6 in) spread over 9 days.
In Mountain View in December, humidity is 87%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that seeps into your bones, making outdoor adventures somewhat uncomfortable and urging travelers to seek refuge in cozy cafes or warm indoor activities.
In Mountain View in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Mountain View, you can check the information here.
UV Risk Categories
Weather in Mountain View varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mountain View, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 5°C (41°F) | 87 mm (3.4 inches) | 86% | moderate |
| February Weather | 8°C (47°F) | 121 mm (4.8 inches) | 85% | high |
| March Weather | 11°C (52°F) | 97 mm (3.8 inches) | 84% | very high |
| April Weather | 15°C (60°F) | 119 mm (4.7 inches) | 82% | very high |
| May Weather | 20°C (69°F) | 124 mm (4.9 inches) | 83% | very high |
| June Weather | 24°C (75°F) | 93 mm (3.6 inches) | 82% | extreme |
| July Weather | 26°C (79°F) | 81 mm (3.2 inches) | 80% | extreme |
| August Weather | 25°C (77°F) | 114 mm (4.5 inches) | 74% | very high |
| September Weather | 22°C (73°F) | 126 mm (4.9 inches) | 75% | very high |
| October Weather | 17°C (63°F) | 120 mm (4.7 inches) | 79% | very high |
| November Weather | 9°C (49°F) | 87 mm (3.4 inches) | 87% | moderate |
| December Weather | 7°C (45°F) | 116 mm (4.6 inches) | 87% | moderate |