December weather forecast
San Jose, CA

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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

December is the city's entry into the winter season, with a clear drop in temperature and a moderate increase in rainfall. The month experiences an average of 7.6 rainfall days, making it one of the rainier times of the year. Along with the decreased temperatures, the daylight hours also shorten to the annual minimum of 9.6 hours daily. Even though the holiday season may bring warmth to the spirit, San Jose's December weather definitely rings in a chillier phase.

Temperature

San Jose's temperature records reveal December as the coldest month, marked by average highs of 56.5°F (13.6°C) and lows of 43°F (6.1°C).

Humidity

The average relative humidity in December is 71%.

Rainfall

In December, in San Jose, the rain falls for 7.6 days. Throughout December, 0.71" (18mm) of precipitation is accumulated. Throughout the year, there are 51.5 rainfall days, and 4.06" (103mm) of precipitation is accumulated.

Daylight

With an average of 9h and 36min of daylight, December has the shortest days of the year.
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 5:00 pm PST.

Sunshine

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

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. 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: An average UV index of 3 in December transforms into this advice:
Heed the precautions - Suggestions to avoid sunburn are made. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Experience reduced UV exposure by about half when donning a wide-brim hat.
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Frequently asked questions

What part of the year is the coldest in San Jose?

San Jose's coldest month, December, registers temperatures that range from a high of 56.5°F (13.6°C) to a low of 43°F (6.1°C).

What is the average December temperature in San Jose?

In December, the average high-temperature and low-temperature are 56.5°F (13.6°C) and 43°F (6.1°C) respectively. In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is evaluated at 84.2°F (29°C).

What is the average humidity in December in San Jose?

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

How much does it rain in San Jose in December?

In San Jose, in December, it is raining for 7.6 days, with typically 0.71" (18mm) of accumulated precipitation.

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

With an average of 9h and 36min of daylight, December has the shortest days of the year.

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

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

What time 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 5:00 pm PST.

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

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

How long on average sun shines in December in San Jose?

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

What is the month with 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 in San Jose.

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

The average daily maximum UV index in December in San Jose, California, is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
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 4min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • 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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San Jose, California, USA

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