January 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 January

San Jose weather in January displays the typical characteristics of the Californian winter. Dry cool air dominates the region, with relatively low temperatures and cloud cover. The city experiences wind speeds of 4.6mph (7.4km/h) on average, which can peak at 5.2mph (8.4km/h) and gust up to 7.5mph (12.1km/h), creating a cool breeze throughout the city. Showers are relatively frequent, making it one of the wetter months of the year. January sets the year off with a mild and gentle pace.

Temperature

In January, San Jose experiences a minor shift in meteorological conditions with average high-temperatures marked at a still refreshing 58.1°F (14.5°C), closely mirroring the climate in December. Nighttime temperatures in San Jose, California, hover around an average low of 43.3°F (6.3°C) in January.

Humidity

In San Jose, the average relative humidity in January is 72%.

Rainfall

In San Jose, in January, during 6.3 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. Throughout the year, in San Jose, there are 51.5 rainfall days, and 4.06" (103mm) of precipitation is accumulated.

Daylight

The average length of the day in January is 9h and 56min.
On the first day of January, sunrise is at 7:21 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:30 pm PST.

Sunshine

In January, the average sunshine in San Jose is 6.3h.

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 unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum daily UV index of 3 during January morphs into the following directions:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
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Frequently asked questions

What are January temperatures in San Jose?

January temperatures vary between a high-temperature of 58.1°F (14.5°C) and a low-temperature of 43.3°F (6.3°C).

What is the average humidity in January in San Jose?

The average relative humidity in January in San Jose, California, is 72%.

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

In San Jose, in January, it is raining for 6.3 days, with typically 0.63" (16mm) of accumulated precipitation.

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

The average day length in January is 9h and 56min.

When are sunrise and sunset in January in San Jose?

In January, on the first day of the month, sunrise is at 7:21 am and sunset at 5:00 pm. On the last day of the month, in San Jose, California, sunrise is at 7:11 am and sunset at 5:30 pm PST.

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

The average sunshine duration in January in San Jose, California, is 6.3h.

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.

What is the UV index reading in January in San Jose?

The average daily maximum UV index in January in San Jose is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
San Jose, CA

Average temperature in January - San Jose, CA
  • Average high temperature in January: 58.1°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 January: 43.3°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 January
San Jose, CA

Average pressure in January - San Jose, CA
  • Average pressure in January: 30.13"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 January
San Jose, CA

Average wind speed in January - San Jose, CA
  • Average wind speed in January: 4.6mph

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 January
San Jose, CA

Average humidity in January - San Jose, CA
  • Average humidity in January: 72%

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 January
San Jose, CA

Average rainfall in January - San Jose, CA
  • Average rainfall in January: 0.63"

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 January
San Jose, CA

Average rainfall days in January - San Jose, CA
  • Average rainfall days in January: 6.3 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 January /
Average sunshine in January
San Jose, CA

Average daylight in January / Average sunshine in January - San Jose, CA
  • Average daylight in January: 9h and 5min

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 January: 6h and 2min

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 January
San Jose, CA

Average sunshine days in January - San Jose, CA
  • Average sunshine days in January: 23.3 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 January
San Jose, CA

Average UV index in January - San Jose, CA
  • Average UV index in January: 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 January
San Jose, CA

Average cloud cover in January - San Jose, CA
  • Average cloud cover in January: 30

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 January
San Jose, CA

Average visibility in January - San Jose, CA
  • Average visibility in January: 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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