Brentwood
California, USA
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Brentwood, CA

An aerial shot of scenic and organized home community in Brentwood City, California
An aerial shot of scenic and organized home community in Brentwood City, California
January in Brentwood, California, is a moderate winter month, with average temperature fluctuating between 56.1°F (13.4°C) and 41.5°F (5.3°C).

Temperature

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

Humidity

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

Rainfall

In Brentwood, during January, the rain falls for 8.6 days and regularly aggregates up to 1.89" (48mm) of precipitation. In Brentwood, during the entire year, the rain falls for 62 days and collects up to 10.16" (258mm) of precipitation.

Snowfall

In Brentwood, California, snow does not fall through November.

Daylight

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

Sunshine

The average sunshine in January is 6h.

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 estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 3 in January 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in January in Brentwood?

In Brentwood, in January, the average high-temperature is 56.1°F (13.4°C), and the average low-temperature is 41.5°F (5.3°C).

What is the most humid month in Brentwood?

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

What is the average humidity in January in Brentwood?

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

How many days does it rain in January in Brentwood?

In Brentwood, in January, it is raining for 8.6 days, with typically 1.89" (48mm) of accumulated precipitation.

Does it snow in Brentwood in January?

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

When it does not snow in Brentwood?

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

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

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

How many hours of sunshine does Brentwood have in January?

The average sunshine in January in Brentwood, California, is 6h.

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

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

How high is the UV index in January in Brentwood?

In Brentwood, the average daily maximum UV index in January is 3. A UV Index of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.
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).

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%).

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

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

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 lowest number of rainy days is August (0.8 days).

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 lowest number of snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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 shortest days is December (Average daylight: 9.6h).

  • Average sunshine in January: 6h

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

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).