January weather forecast
Sonoma, CA

Neat rows of vines in a vineyard farm in Sonoma, California
Neat rows of vines in a vineyard farm in Sonoma, California

Weather in January

January in Sonoma, California, is a mild winter month, with an average temperature varying between 42.1°F (5.6°C) and 56.3°F (13.5°C).

Temperature

In Sonoma, California, the average high-temperature in January is essentially the same as in December - a moderate 56.3°F (13.5°C). In January, in Sonoma, the average low-temperature is 42.1°F (5.6°C).

Humidity

In January, the average relative humidity in Sonoma is 74%.

Rainfall

In January, in Sonoma, the rain falls for 10.4 days. Throughout January, 2.87" (73mm) of precipitation is accumulated. In Sonoma, during the entire year, the rain falls for 73.3 days and collects up to 15.47" (393mm) of precipitation.

Daylight

In Sonoma, the average length of the day in January is 9h and 52min.
On the first day of the month, sunrise is at 7:26 am and sunset at 5:00 pm. On the last day of January, in Sonoma, sunrise is at 7:15 am and sunset at 5:31 pm PST.

Sunshine

The average sunshine in January in Sonoma is 5.7h.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate health risk from 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 - Protection against sun damage is advised. 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 Sonoma?

The average relative humidity in January in Sonoma, California, is 74%.

How many days does it rain in January in Sonoma?

In Sonoma, California, in January, during 10.4 rainfall days, 2.87" (73mm) of precipitation is typically accumulated.

What is the average length of the day in January in Sonoma?

In Sonoma, the average day length in January is 9h and 52min.

When are sunrise and sunset in January in Sonoma?

In January, on the first day of the month, sunrise is at 7:26 am and sunset at 5:00 pm. On the last day of the month, in Sonoma, sunrise is at 7:15 am and sunset at 5:31 pm PST.

How many hours of sunshine does Sonoma have in January?

In Sonoma, the average sunshine duration in January is 5.7h.

What is the month with the lowest UV index in Sonoma?

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

How high is the UV index in January in Sonoma?

In Sonoma, California, the average daily maximum UV index in January is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Sonoma, CA

Average temperature in January - Sonoma, CA
  • Average high temperature in January: 56.3°F

The warmest month (with the highest average high temperature) is August (82.9°F).
The month with the lowest average high temperature is December (55°F).

  • Average low temperature in January: 42.1°F

The month with the highest average low temperature is August (54.9°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).

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Average pressure in January
Sonoma, CA

Average pressure in January - Sonoma, CA
  • Average pressure in January: 30.13"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in January
Sonoma, CA

Average wind speed in January - Sonoma, CA
  • Average wind speed in January: 4.8mph

The windiest month (with the highest average wind speed) is May (6.2mph).
The calmest month (with the lowest average wind speed) is November (4.4mph).

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Average humidity in January
Sonoma, CA

Average humidity in January - Sonoma, CA
  • Average humidity in January: 74%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (59%).

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Average rainfall in January
Sonoma, CA

Average rainfall in January - Sonoma, CA
  • Average rainfall in January: 2.87"

The wettest month (with the highest rainfall) is February (3.43").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in January
Sonoma, CA

Average rainfall days in January - Sonoma, CA
  • Average rainfall days in January: 10.4 days

The month with the highest number of rainy days is March (13.4 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
Sonoma, CA

Average daylight in January / Average sunshine in January - Sonoma, CA
  • Average daylight in January: 9h and 52min

The month with the longest days is June (Average daylight: 14h and 47min).
The month with the shortest days is December (Average daylight: 9h and 33min).

  • Average sunshine in January: 5h and 42min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).

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Average sunshine days in January
Sonoma, CA

Average sunshine days in January - Sonoma, CA
  • Average sunshine days in January: 19.9 days

The month with the most sunshine days is July (28.7 days).
The month with the least sunshine days is March (16.1 days).

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Average UV index in January
Sonoma, CA

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

The months with the highest UV index are June and July (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
Sonoma, CA

Average cloud cover in January - Sonoma, CA
  • Average cloud cover in January: 37

The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is July (Cloud cover 8).

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Average visibility in January
Sonoma, CA

Average visibility in January - Sonoma, 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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