January weather forecast and climate
Brentwood, CA

Scenic and organized home community in Brentwood City, California
Scenic and organized home community in Brentwood City, California

Weather in January

January is a moderate winter month in Brentwood, California, with average temperature varying between 56.1°F (13.4°C) and 41.5°F (5.3°C).

Temperature

In Brentwood, the average high-temperature is relatively the same as in December - a moderate 56.1°F (13.4°C). The average low-temperature, in Brentwood, is 41.5°F (5.3°C).

Humidity

The most humid month in Brentwood, California, is January, with an average relative humidity of 74%.

Rainfall

In Brentwood, in January, it is raining for 8.6 days, with typically 1.89" (48mm) of accumulated precipitation. Throughout the year, there are 62 rainfall days, and 10.16" (258mm) of precipitation is accumulated.

Snowfall

January through November are months without snowfall in Brentwood.

Daylight

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

Sunshine

The average sunshine in Brentwood is 6h.

UV index

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 3 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 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 most humid month in Brentwood?

With an average relative humidity of 74%, January is the most humid month in Brentwood, California.

What is the average humidity in January in Brentwood?

In January, the average relative humidity is 74%.

How many days does it rain in January in Brentwood?

In January, in Brentwood, the rain falls for 8.6 days. Throughout January, 1.89" (48mm) of precipitation is accumulated.

When it does not snow in Brentwood?

January through November are months without snowfall in Brentwood, California.

Does it snow in Brentwood in January?

In January, it doesn't snow. December is the latest month when it typically snows.

How many hours of daylight does Brentwood have in January?

The average length of the day in January is 9.9h.

How long on average sun shines in January in Brentwood?

In Brentwood, California, the average sunshine in January is 6h.

When is the lowest UV index in Brentwood?

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

How high is the UV index in January in Brentwood?

In Brentwood, California, the average daily maximum UV index in January is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in January
Brentwood, CA

Average temperature in January - Brentwood, CA
  • Average high temperature in January: 56.1°F

The warmest month (with the highest average high temperature) is July (88.5°F).
The month with the lowest average high temperature is December (55°F).

  • Average low temperature in January: 41.5°F

The month with the highest average low temperature is September (57.7°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).

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Average pressure in January
Brentwood, CA

Average pressure in January - Brentwood, CA
  • Average pressure in January: 30.14"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in January
Brentwood, CA

Average wind speed in January - Brentwood, CA
  • Average wind speed in January: 4.5mph

The windiest month (with the highest average wind speed) is June (7.8mph).
The calmest months (with the lowest average wind speed) are January and November (4.5mph).

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Average humidity in January
Brentwood, CA

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

The month with the highest relative humidity is January (74%).
The month with the lowest relative humidity is September (52%).

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Average rainfall in January
Brentwood, CA

Average rainfall in January - Brentwood, CA
  • Average rainfall in January: 1.89"

The wettest month (with the highest rainfall) is February (2.09").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in January
Brentwood, CA

Average rainfall days in January - Brentwood, CA
  • Average rainfall days in January: 8.6 days

The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (0.8 days).

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Average snowfall days in January
Brentwood, CA

Average snowfall days in January - Brentwood, CA
  • Average snowfall days in January: 0 days

The month with the highest number of snowfall days is December (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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

Average daylight in January / Average sunshine in January - Brentwood, 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: 9.6h).

  • Average sunshine in January: 6h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days in January
Brentwood, CA

Average sunshine days in January - Brentwood, CA
  • Average sunshine days in January: 21.8 days

The month with the most sunshine days is August (29.8 days).
The month with the least sunshine days is March (17.7 days).

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Average UV index in January
Brentwood, CA

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

Months with the highest UV index are June, July and August (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
Brentwood, CA

Average cloud cover in January - Brentwood, CA
  • Average cloud cover in January: 34

Months with the most cloud cover are March and December (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 5).

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Average visibility in January
Brentwood, CA

Average visibility in January - Brentwood, 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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