December weather forecast
San Jose, CA

A sunset panorama of the lit city of San Jose, California
A sunset panorama of the lit city of San Jose, California

Weather in December

The first month of the winter, December, is still a mild month in San Jose, California, with an average temperature ranging between min 43°F (6.1°C) and max 56.5°F (13.6°C).

Temperature

December is the coldest month, with an average high-temperature of 56.5°F (13.6°C) and an average low-temperature of 43°F (6.1°C).

Humidity

The average relative humidity in December in San Jose is 71%.

Rainfall

In December, the rain falls for 7.6 days. Throughout December, 0.71" (18mm) of precipitation is accumulated. In San Jose, during the entire year, the rain falls for 51.5 days and collects up to 4.06" (103mm) of precipitation.

Daylight

The month with the shortest days is December, with an average of 9h and 38min of daylight.
On the first day of the month, sunrise is at 7:03 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:59 pm PST.

Sunshine

December has the least sunshine of the year in San Jose, with an average of 6h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 3 in December interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the coldest month in San Jose?

With an average high-temperature of 56.5°F (13.6°C) and an average low-temperature of 43°F (6.1°C), December is the coldest month.

What is the temperature in December in San Jose?

In December, in San Jose, California, the average high-temperature is 56.5°F (13.6°C), and the average low-temperature is 43°F (6.1°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 84.2°F (29°C).

What is the average humidity in December in San Jose?

In December, the average relative humidity in San Jose, California, is 71%.

How many days does it rain in December in San Jose?

In San Jose, California, during December, the rain falls for 7.6 days and regularly aggregates up to 0.71" (18mm) of precipitation.

What is the month with the shortest days in San Jose?

The month with the shortest days in San Jose is December, with an average of 9h and 38min of daylight.

What is the average length of the day in December in San Jose?

In December, the average day length in San Jose, California, is 9h and 38min.

When are sunrise and sunset in December in San Jose?

On the first day of December in San Jose, sunrise is at 7:03 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:59 pm PST.

What is the month with the least sunshine in San Jose?

December has the least sunshine of the year in San Jose, California, with an average of 6h of sunshine.

How many hours of sunshine does San Jose have in December?

The average sunshine duration in December in San Jose, California, is 6h.

When is the lowest UV index in San Jose?

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.

What is the UV index intensity in December in San Jose?

In December, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
San Jose, CA

Average temperature in December - San Jose, CA
  • Average high temperature in December: 56.5°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is December (56.5°F).

  • Average low temperature in December: 43°F

The month with the highest average low temperature is August (56.5°F).
The coldest month (with the lowest average low temperature) is December (43°F).

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Average pressure in December
San Jose, CA

Average pressure in December - San Jose, CA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).

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Average wind speed in December
San Jose, CA

Average wind speed in December - San Jose, CA
  • Average wind speed in December: 5mph

The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest months (with the lowest average wind speed) are September and October (4.4mph).

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Average humidity in December
San Jose, CA

Average humidity in December - San Jose, CA
  • Average humidity in December: 71%

The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are July and September (60%).

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Average rainfall in December
San Jose, CA

Average rainfall in December - San Jose, CA
  • Average rainfall in December: 0.71"

The wettest month (with the highest rainfall) is March (0.83").
The driest months (with the least rainfall) are June, July and August (0.04").

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Average rainfall days in December
San Jose, CA

Average rainfall days in December - San Jose, CA
  • Average rainfall days in December: 7.6 days

The month with the highest number of rainy days is March (9.8 days).
The month with the least rainy days is August (0.4 days).

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Average daylight in December /
Average sunshine in December
San Jose, CA

Average daylight in December / Average sunshine in December - San Jose, CA
  • Average daylight in December: 9h and 38min

The month with the longest days is June (Average daylight: 14h and 41min).
The month with the shortest days is December (Average daylight: 9h and 38min).

  • Average sunshine in December: 6h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

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Average sunshine days in December
San Jose, CA

Average sunshine days in December - San Jose, CA
  • Average sunshine days in December: 22.3 days

The month with the most sunshine days is August (29.7 days).
The month with the least sunshine days is March (19.5 days).

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Average UV index in December
San Jose, CA

Average UV index in December - San Jose, CA
  • Average UV index in December: 3

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
San Jose, CA

Average cloud cover in December - San Jose, CA
  • Average cloud cover in December: 33

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 6).

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Average visibility in December
San Jose, CA

Average visibility in December - San Jose, CA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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