January weather forecast and climate
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 January

January, the same as December, in San Jose, California, is another mild winter month, with average temperature varying between 58.1°F (14.5°C) and 43.3°F (6.3°C).

Temperature

In January, the average high-temperature is practically the same as in December - a still moderate 58.1°F (14.5°C). In January, in San Jose, the average low-temperature is 43.3°F (6.3°C).

Humidity

In January, the average relative humidity is 72%.

Rainfall

In January, the rain falls for 6.3 days. Throughout January, 0.63" (16mm) 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

In January, the average length of the day is 9.9h.

Sunshine

The average sunshine in January is 6.3h.

UV index

Months with the lowest UV index in San Jose 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 health hazard from the exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 in January transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in January in San Jose?

In San Jose, California, in January, the average high-temperature is 58.1°F (14.5°C), and the average low-temperature is 43.3°F (6.3°C).

What is the average humidity in January in San Jose?

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

How much does it rain in San Jose in January?

In January, in San Jose, California, the rain falls for 6.3 days. Throughout January, 0.63" (16mm) of precipitation is accumulated.

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

In January, the average length of the day is 9.9h.

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

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

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 in San Jose, California.

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

In San Jose, California, the average daily maximum UV index in January is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV rays.

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"

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

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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%).
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: 9.9h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in January: 6.3h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6h).

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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

Months with the highest UV index are June, July and August (UV index 6).
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

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

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