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United StatesThe weather in December in San Jose
It's cool to moderate in December in San Jose with an average temperature of 16°C. Temperatures this month range from a low of 14°C to a high of 18°C. At night, you can expect temperatures between 5°C and 9°C.
Looking for sun and warm weather? December isn’t a good month to be in San Jose. The temperatures are too low for a warm stay this month.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in December for San Jose, California. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 24°C in 2021, San Jose reached the highest temperature in December over the past 10 years. The lowest daytime temperature in this month was 8°C in 2015. The extreme nighttime temperatures ranged from a lowest recorded value of -1°C to a highest value of 15°C.
Rainfall amount
In December, there is an average of 64 mm of precipitation, spread over 10 days. The wind speed is around 3 Bft, mostly coming from the Southwest.
Daily weather in December for San Jose
Click on any day in December to get detailed info about the usual weather on that day in San Jose. Check out the historical temperatures and precipitation over the past 10 years on this day.
December weather comparison
| San Jose | New York | |
|---|---|---|
| Average temperature | 16°C | 9°C |
| Max. temperature | 18°C | 12°C |
| Min. temperature | 5°C | -5°C |
| Total precipitation | 64 mm | 133 mm |
| Rainy days | 10 days | 17 days |
Start of December
The month of December starts in San Jose with mild temps, averaging around 18°C during the day and nights around 9°C.
Mid December
By mid-December, daytime temps drop to around 16°C, with nights around 7°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of December
By the end of December, the average daytime temperature in San Jose is around 16°C, while nighttime temps are about 7°C. A shower might pop up, but overall, the weather will be dry and sunny.
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UV index
The UV index is a maximum of 4 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of San Jose for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in December in San Jose, California. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in December in San Jose
Temperature in December in San Jose over the years
Precipitation charts
These charts show the average amount of precipitation in December in San Jose, California. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in December in San Jose
Total precipitation in December in San Jose over the years
Daily UV index in December in San Jose
This chart shows the average daily UV index in December in San Jose, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in December in San Jose
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Average weather in San Jose by month
Click on a month below to see detailed weather info for San Jose. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.