Santa Clara County (San Jose)
December
Weather in Santa Clara County for December 2025
Your guide to Santa Clara County weather in December - trends and predictions
In general, the average temperature in Santa Clara County at the beginning of December is 17.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.1 °F by the end of December.
Santa Clara County experiences moderate rainfall in December, with an average of 8 rainy days and a total precipitation of 138.7 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
23
Dry days
8
Rainy days
0
Snow days
16°/8°
Temperatures
9 km/h
Avg max wind
68 %
Avg humidity
Santa Clara County in December average weather
Move between months or click on a day
| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  18° | 2  17° | 3 17° | 4 17° | 5 20° | 6  17° | |
| 7 15° | 8  15° | 9  15° | 10  17° | 11 16° | 12 14° | 13 15° |
| 14 15° | 15  15° | 16 15° | 17 17° | 18 15° | 19 17° | 20 15° |
| 21 15° | 22 17° | 23 16° | 24 16° | 25 15° | 26 15° | 27  15° |
| 28 15° | 29  13° | 30 13° | 31 13° |
You can click on date
Access Santa Clara County weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during December in Santa Clara County
See the weather trend as well as the moving average line
December weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Dec. 1 | Fog | 18° /8° | 0 mm | 4 | |
| Dec. 2 | Patchy rain possible | 17° /8° | 0 mm | 5 | |
| Dec. 3 | Mist | 17° /8° | 0 mm | 5 | |
| Dec. 4 | Mist | 17° /9° | 0 mm | 5 | |
| Dec. 5 | Mist | 20° /9° | 0 mm | 5 | |
| Dec. 6 | Light rain | 17° /9° | 1.9 mm | 5 | |
| Dec. 7 | Light rain shower | 15° /8° | 0.5 mm | 4 | |
| Dec. 8 | Cloudy | 15° /7° | 0 mm | 4 | |
| Dec. 9 | Partly cloudy | 15° /4° | 0 mm | 4 | |
| Dec. 10 | Overcast | 17° /4° | 0 mm | 5 | |
| Dec. 11 | Overcast | 16° /7° | 0 mm | 5 | |
| Dec. 12 | Overcast | 14° /8° | 11.7 mm | 4 | |
| Dec. 13 | Overcast | 15° /7° | 0 mm | 4 | |
| Dec. 14 | Overcast | 15° /8° | 33.1 mm | 4 | |
| Dec. 15 | Sunny | 15° /6° | 0 mm | 4 | |
| Dec. 16 | Partly cloudy | 15° /7° | 0 mm | 5 | |
| Dec. 17 | Patchy rain possible | 17° /8° | 0 mm | 4 | |
| Dec. 18 | Light rain shower | 15° /9° | 6.3 mm | 4 | |
| Dec. 19 | Light rain shower | 17° /10° | 9.6 mm | 5 | |
| Dec. 20 | Light rain shower | 15° /11° | 12.8 mm | 4 | |
| Dec. 21 | Partly cloudy | 15° /9° | 0 mm | 4 | |
| Dec. 22 | Partly cloudy | 17° /9° | 0 mm | 5 | |
| Dec. 23 | Partly cloudy | 16° /8° | 0 mm | 5 | |
| Dec. 24 | Sunny | 16° /8° | 19.4 mm | 4 | |
| Dec. 25 | Overcast | 15° /7° | 0 mm | 4 | |
| Dec. 26 | Overcast | 15° /8° | 0.3 mm | 4 | |
| Dec. 27 | Moderate or heavy rain shower | 15° /10° | 25.1 mm | 3 | |
| Dec. 28 | Partly cloudy | 15° /9° | 0.2 mm | 4 | |
| Dec. 29 | Heavy rain at times | 13° /8° | 10.8 mm | 3 | |
| Dec. 30 | Moderate or heavy rain shower | 13° /7° | 11.6 mm | 3 | |
| Dec. 31 | Moderate or heavy rain shower | 13° /6° | 17.7 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for Santa Clara County in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Santa Clara County forecast closer to your planned date for the most up-to-date weather information.
Santa Clara County in December - FAQ
What are the expected maximum and minimum temperatures in Santa Clara County during December?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Santa Clara County during December?
Significant rainfall exceeding 138.7 mm is expected in Santa Clara County during December, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Santa Clara County during December?
The average wind speed in Santa Clara County during December is 9 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in Santa Clara County
Explore the daily rainfall trends and prepare for Santa Clara Countys December weather 💧
Top locations in Santa Clara County
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is Santa Clara County?Get accurate weather forecasts for Santa Clara County, located at latitude 37.339 and longitude -121.895. Stay updated with localized weather information tailored for Santa Clara County.
Found a mistake?
We appreciate your attention to details. Tell us here.