San Jose
December
Weather in San Jose for December 2025
Your guide to San Jose weather in December - trends and predictions
In general, the average temperature in San Jose 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.
San Jose experiences moderate rainfall in December, with an average of 8 rainy days and a total precipitation of 138.7 mm.
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Temperatures
Rain 🌧️
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23
Dry days
8
Rainy days
0
Snow days
16°/8°
Temperatures
9 km/h
Avg max wind
68 %
Avg humidity
San Jose in December average weather
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| 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° |
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Temperatures trend during December in San Jose
See the weather trend as well as the moving average line
December weather day by day
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| 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 | |
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Important Notice
Our weather forecast for San Jose 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 San Jose forecast closer to your planned date for the most up-to-date weather information.
San Jose in December - FAQ
What are the expected maximum and minimum temperatures in San Jose 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 San Jose during December?
Significant rainfall exceeding 138.7 mm is expected in San Jose during December, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in San Jose during December?
The average wind speed in San Jose during December is 9 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in San Jose
Explore the daily rainfall trends and prepare for San Joses December weather 💧
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