January weather forecast
Sunnyvale, CA

The perfect blue sky, trees, buildings, and cute water fountain all reflected in the calm pool of water with birds in Sunnyvale, California
The perfect blue sky, trees, buildings, and cute water fountain all reflected in the calm pool of water with birds in Sunnyvale, California

Weather in January

January, like December, is another mild winter month in Sunnyvale, California, with an average temperature ranging between min 44.6°F (7°C) and max 58.3°F (14.6°C).

Temperature

In January, the average high-temperature is essentially the same as in December - a still moderate 58.3°F (14.6°C). In Sunnyvale, in January, the average low-temperature is 44.6°F (7°C).

Humidity

The average relative humidity in January is 72%.

Rainfall

In Sunnyvale, during January, the rain falls for 6.3 days and regularly aggregates up to 0.55" (14mm) of precipitation. In Sunnyvale, California, during the entire year, the rain falls for 50 days and collects up to 3.9" (99mm) of precipitation.

Daylight

The average length of the day in January in Sunnyvale is 9h and 56min.
On the first day of January, sunrise is at 7:22 am and sunset at 5:01 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:31 pm PST.

Sunshine

In Sunnyvale, the average sunshine in January is 6.3h.

UV index

In Sunnyvale, the average daily maximum UV index in January is 4. 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: The average daily UV index of 4 in January transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in January in Sunnyvale?

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

How much does it rain in Sunnyvale in January?

In Sunnyvale, California, in January, during 6.3 rainfall days, 0.55" (14mm) of precipitation is typically accumulated.

How many hours of daylight does Sunnyvale have in January?

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

What time are sunrise and sunset in January in Sunnyvale?

In January, on the first day of the month, sunrise is at 7:22 am and sunset at 5:01 pm. On the last day of the month, in Sunnyvale, California, sunrise is at 7:11 am and sunset at 5:31 pm PST.

How long on average sun shines in January in Sunnyvale?

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

What is the UV index intensity in January in Sunnyvale?

In January, the average daily maximum UV index in Sunnyvale is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to Sun's UV rays.

Average temperature in January
Sunnyvale, CA

Average temperature in January - Sunnyvale, CA
  • Average high temperature in January: 58.3°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is December (56.8°F).

  • Average low temperature in January: 44.6°F

The month with the highest average low temperature is August (56.8°F).
The coldest months (with the lowest average low temperature) are February and December (44.2°F).

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Average pressure in January
Sunnyvale, CA

Average pressure in January - Sunnyvale, 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 and September (29.92"Hg).

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Average wind speed in January
Sunnyvale, CA

Average wind speed in January - Sunnyvale, 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
Sunnyvale, CA

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

The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are September and October (63%).

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Average rainfall in January
Sunnyvale, CA

Average rainfall in January - Sunnyvale, CA
  • Average rainfall in January: 0.55"

The wettest months (with the highest rainfall) are February and March (0.75").
The driest month (with the least rainfall) is July (0").

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Average rainfall days in January
Sunnyvale, CA

Average rainfall days in January - Sunnyvale, CA
  • Average rainfall days in January: 6.3 days

The month with the highest number of rainy days is March (9.6 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
Sunnyvale, CA

Average daylight in January / Average sunshine in January - Sunnyvale, CA
  • Average daylight in January: 9h and 56min

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 38min).

  • 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: 5.9h).

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Average sunshine days in January
Sunnyvale, CA

Average sunshine days in January - Sunnyvale, CA
  • Average sunshine days in January: 23.8 days

The month with the most sunshine days is August (30.1 days).
The month with the least sunshine days is March (19.9 days).

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Average UV index in January
Sunnyvale, CA

Average UV index in January - Sunnyvale, CA
  • Average UV index in January: 4

The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are February, November and December (UV index 3).

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Average cloud cover in January
Sunnyvale, CA

Average cloud cover in January - Sunnyvale, 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
Sunnyvale, CA

Average visibility in January - Sunnyvale, 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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