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 is a moderate winter month in Sonoma, California, with temperature in the range of an average high of 56.3°F (13.5°C) and an average low of 42.1°F (5.6°C).

Temperature

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

Humidity

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

Rainfall

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

Daylight

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

Sunshine

In Sonoma, California, the average sunshine 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 of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In January, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. 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.
[Resources]

FAQ

What is the average humidity in January in Sonoma?

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

How many days does it rain in January in Sonoma?

In Sonoma, California, during January, the rain falls for 10.4 days and regularly aggregates up to 2.87" (73mm) of precipitation.

How many hours of daylight does Sonoma have in January?

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

How long on average sun shines in January in Sonoma?

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

What are the months 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, California.

What is the UV index intensity in January in Sonoma?

In January, the average daily maximum UV index 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
Sonoma, CA

Average temperature in January - Sonoma, CA
  • Average high temperature in January: 13.5°C

The warmest month (with the highest average high temperature) is August (28.3°C).
The month with the lowest average high temperature is December (12.8°C).

  • Average low temperature in January: 5.6°C

The month with the highest average low temperature is August (12.7°C).
The coldest month (with the lowest average low temperature) is December (5.2°C).

[Resources]

Average pressure in January
Sonoma, CA

Average pressure in January - Sonoma, CA
  • Average pressure in January: 1020.4mbar

The month with the highest atmospheric pressure is January (1020.4mbar).
The month with the lowest atmospheric pressure is June (1013mbar).

[Resources]

Average wind speed in January
Sonoma, CA

Average wind speed in January - Sonoma, CA
  • Average wind speed in January: 7.7km/h

The windiest month (with the highest average wind speed) is May (10km/h).
The calmest month (with the lowest average wind speed) is November (7.1km/h).

[Resources]

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%).

[Resources]

Average rainfall in January
Sonoma, CA

Average rainfall in January - Sonoma, CA
  • Average rainfall in January: 73mm

The wettest month (with the highest rainfall) is February (87mm).
The driest months (with the least rainfall) are July and August (1mm).

[Resources]

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).

[Resources]

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

Average daylight in January / Average sunshine in January - Sonoma, CA
  • Average daylight in January: 9.9h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in January: 5.7h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.6h).

[Resources]

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).

[Resources]

Average UV index in January
Sonoma, CA

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

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

[Resources]

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).

[Resources]

Average visibility in January
Sonoma, CA

Average visibility in January - Sonoma, CA
  • Average visibility in January: 9km

Months with the highest visibility are June, July and September (10km).
Months with the lowest visibility are January, February, March, April, May, August, October, November and December (9km).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location