Last updated: June 24, 2025
In December, the average temperature in Lucas Valley-Marinwood, United States hovers around 10°C (51°F), with extremes ranging from a brisk 3°C (38°F) to a warm 22°C (72°F). Be prepared for some rain, as you can expect about 98 mm (3.9 in) of precipitation over approximately 9 days. With an average humidity of 79%, it's a month that combines cool breezes with the potential for soggy days—perfect for cozy indoor activities!
In December in Lucas Valley-Marinwood, the average temperature is 10°C (51°F). Maximums can reach 22°C (72°F) and minimums can be as low as 3°C (38°F). It's a great time for travelers to enjoy mild weather while exploring the sights and sounds of Lucas Valley-Marinwood.
In Lucas Valley-Marinwood in December, the precipitation amount is 98 mm (3.9 in) spread over a duration of 9 days.
In Lucas Valley-Marinwood in December, humidity is 79%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and travel somewhat uncomfortable unless you're properly layered.
In Lucas Valley-Marinwood 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 Lucas Valley-Marinwood, you can check the information here.
UV Risk Categories
Weather in Lucas Valley-Marinwood varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Lucas Valley-Marinwood, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 10°C (51°F) | 111 mm (4.4 inches) | 85% | moderate |
| February Weather | 11°C (52°F) | 116 mm (4.6 inches) | 82% | moderate |
| March Weather | 12°C (54°F) | 80 mm (3.1 inches) | 82% | very high |
| April Weather | 14°C (57°F) | 35 mm (1.4 inches) | 79% | very high |
| May Weather | 15°C (60°F) | 20 mm (0.8 inches) | 83% | very high |
| June Weather | 17°C (63°F) | 2 mm (0.1 inches) | 84% | extreme |
| July Weather | 17°C (63°F) | 2 mm (0.1 inches) | 87% | extreme |
| August Weather | 18°C (64°F) | 1 mm (0.1 inches) | 87% | very high |
| September Weather | 18°C (65°F) | 2 mm (0.1 inches) | 86% | very high |
| October Weather | 16°C (62°F) | 30 mm (1.2 inches) | 80% | high |
| November Weather | 13°C (55°F) | 48 mm (1.9 inches) | 79% | moderate |
| December Weather | 10°C (51°F) | 98 mm (3.9 inches) | 79% | moderate |