January weather forecast and climate
Cupertino, CA

Weather in January

January, the same as December, in Cupertino, California, is another mild winter month, with average temperature ranging between min 44.6°F (7°C) and max 58.5°F (14.7°C).

Temperature

In Cupertino, the average high-temperature is practically the same as in December - a still moderate 58.5°F (14.7°C). The average low-temperature, in January, is 44.6°F (7°C).

Humidity

The average relative humidity in January is 72%.

Rainfall

In Cupertino, during January, the rain falls for 7.4 days and regularly aggregates up to 0.98" (25mm) of precipitation. Throughout the year, in Cupertino, there are 53.6 rainfall days, and 5.39" (137mm) of precipitation is accumulated.

Daylight

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

Sunshine

The average sunshine in Cupertino is 6.3h.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Cupertino, California. A UV Index of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 3 interpret into the following advice:
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 average humidity in January in Cupertino?

In January, the average relative humidity in Cupertino, California, is 72%.

How many days does it rain in January in Cupertino?

In January, in Cupertino, the rain falls for 7.4 days. Throughout January, 0.98" (25mm) of precipitation is accumulated.

How many hours of daylight does Cupertino have in January?

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

How long on average sun shines in January in Cupertino?

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

What are the months with the lowest UV index in Cupertino?

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

How high is the UV index in January in Cupertino?

The average daily maximum UV index in January in Cupertino is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV rays.

Average temperature in January
Cupertino, CA

Average temperature in January - Cupertino, CA
  • Average high temperature in January: 58.5°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is December (57°F).

  • Average low temperature in January: 44.6°F

The month with the highest average low temperature is August (56.1°F).
The coldest months (with the lowest average low temperature) are February and March (44.2°F).

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Average pressure in January
Cupertino, CA

Average pressure in January - Cupertino, CA
  • Average pressure in January: 30.13"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is September (29.92").

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Average wind speed in January
Cupertino, CA

Average wind speed in January - Cupertino, CA
  • Average wind speed in January: 4.9mph

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is September (4.6mph).

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Average humidity in January
Cupertino, CA

Average humidity in January - Cupertino, CA
  • Average humidity in January: 72%

The month with the highest relative humidity is March (74%).
Months with the lowest relative humidity are July, September and October (64%).

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Average rainfall in January
Cupertino, CA

Average rainfall in January - Cupertino, CA
  • Average rainfall in January: 0.98"

The wettest month (with the highest rainfall) is February (1.02").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in January
Cupertino, CA

Average rainfall days in January - Cupertino, CA
  • Average rainfall days in January: 7.4 days

The month with the highest number of rainy days is March (9 days).
The month with the least rainy days is August (0.8 days).

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Average daylight in January /
Average sunshine in January
Cupertino, CA

Average daylight in January / Average sunshine in January - Cupertino, 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

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.9h).

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Average sunshine days in January
Cupertino, CA

Average sunshine days in January - Cupertino, CA
  • Average sunshine days in January: 22 days

The month with the most sunshine days is August (28.5 days).
Months with the least sunshine days are February and March (20.8 days).

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Average UV index in January
Cupertino, CA

Average UV index in January - Cupertino, CA
  • Average UV index in January: 3

The month with the highest UV index is June (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
Cupertino, CA

Average cloud cover in January - Cupertino, 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 7).

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Average visibility in January
Cupertino, CA

Average visibility in January - Cupertino, 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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