January 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 January

January, like December, is a moderate winter month in San Jose, California, with an average temperature varying between 43.3°F (6.3°C) and 58.1°F (14.5°C).

Temperature

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

Humidity

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

Rainfall

In San Jose, during January, the rain falls for 6.3 days and regularly aggregates up to 0.63" (16mm) of precipitation. Throughout the year, in San Jose, California, there are 51.5 rainfall days, and 4.06" (103mm) of precipitation is accumulated.

Daylight

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

Sunshine

In January, the average sunshine is 6.3h.

UV index

The 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 of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 3 in January interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in January in San Jose?

The average high-temperature, in January, in San Jose, California, is 58.1°F (14.5°C), while 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 is 72%.

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

In January, in San Jose, 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 day length in San Jose, California, is 9h and 56min.

What time are sunrise and sunset in January in San Jose?

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.

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

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

What are the months 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 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 health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
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 56min

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 January: 6h and 18min

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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