Last updated: June 24, 2025
In Santa Clara, United States, the average temperature in December is a pleasant 14°C (57°F). However, temperatures can vary significantly, with a minimum of -4°C (25°F) and reaching up to a striking 30°C (86°F). Expect an average precipitation of 59 mm (2.3 in) spread across 7 days, coupled with a high average humidity of 86%, creating a uniquely vibrant atmosphere.
In December in Santa Clara, the average temperature is 14°C (57°F), with maximums that can reach 30°C (86°F) and minimums that can drop as low as -4°C (25°F). This varied climate makes it essential for travelers to pack both light and warm clothing to ensure comfort during their stay.
In Santa Clara in December, the precipitation amount is 59 mm (2.3 in) over a span of 7 days.
In Santa Clara in December humidity is 86%. With an average temperature of 14°C (57°F), this humidity feels like a heavy blanket enveloping you, making travel feel oppressive and uncomfortably sticky.
In Santa Clara in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Santa Clara.
UV Risk Categories
Weather in Santa Clara varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Santa Clara, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 12°C (54°F) | 43 mm (1.7 inches) | 79% | moderate |
| February Weather | 13°C (56°F) | 51 mm (2.0 inches) | 79% | very high |
| March Weather | 19°C (66°F) | 53 mm (2.1 inches) | 74% | very high |
| April Weather | 21°C (71°F) | 84 mm (3.3 inches) | 76% | extreme |
| May Weather | 26°C (78°F) | 116 mm (4.6 inches) | 81% | extreme |
| June Weather | 28°C (83°F) | 84 mm (3.3 inches) | 76% | extreme |
| July Weather | 30°C (86°F) | 70 mm (2.8 inches) | 66% | extreme |
| August Weather | 30°C (87°F) | 82 mm (3.2 inches) | 58% | extreme |
| September Weather | 27°C (81°F) | 111 mm (4.4 inches) | 65% | extreme |
| October Weather | 22°C (72°F) | 78 mm (3.1 inches) | 74% | very high |
| November Weather | 17°C (62°F) | 51 mm (2.0 inches) | 81% | high |
| December Weather | 14°C (57°F) | 59 mm (2.3 inches) | 86% | moderate |