California · NWS MTR office

Brentwood, CA weather

It is 55°F at BLACK DIAMOND as of Oct 27, 10:28 PM PDT. Tonight: Mostly Clear, low near 49°F. Forecast from the National Weather Service, issued Oct 27, 3:07 PM PDT.

Updated Oct 27, 11:21 PM PDT (snapshot)

Current conditions

Temperature

55°F

Mostly Clear

Wind

SSE 4 mph, gusts 5 mph

Humidity 65% · dew point 44°F

Pressure · visibility

—

Visibility —

Observed at BLACK DIAMOND (PIBC1), Oct 27, 10:28 PM PDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Brentwood forecast zone right now.

Around the NWS MTR forecast area

2 active alerts cover zones served by the MTR office near Brentwood:

  • Coastal Flood Advisory (2)

From the alert snapshot of Oct 28, 2026, 2:15 AM EDT. California has 8 active alerts: see them all.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Brentwood (local time)
TimeTempForecastPrecip. chanceWind
Tue 11 PM54°FMostly Clear0%W 1 mph
Wed 12 AM53°FMostly Clear0%W 1 mph
Wed 1 AM52°FMostly Clear0%W 1 mph
Wed 2 AM51°FMostly Clear0%WNW 1 mph
Wed 3 AM51°FMostly Clear0%WNW 2 mph
Wed 4 AM51°FMostly Clear0%WNW 2 mph
Wed 5 AM49°FMostly Clear0%WNW 2 mph
Wed 6 AM49°FSunny0%WNW 2 mph
Wed 7 AM49°FSunny0%WNW 2 mph
Wed 8 AM49°FSunny0%WNW 2 mph
Wed 9 AM54°FSunny0%NW 3 mph
Wed 10 AM57°FSunny0%NNW 5 mph
Wed 11 AM60°FSunny0%NNW 6 mph
Wed 12 PM63°FSunny0%NNW 6 mph
Wed 1 PM67°FSunny0%NNW 6 mph
Wed 2 PM69°FSunny0%NNW 6 mph
Wed 3 PM70°FSunny0%NW 5 mph
Wed 4 PM70°FSunny0%NW 5 mph
Wed 5 PM70°FSunny0%WNW 2 mph
Wed 6 PM67°FMostly Clear0%WNW 2 mph
Wed 7 PM63°FMostly Clear0%WNW 2 mph
Wed 8 PM59°FPartly Cloudy0%W 1 mph
Wed 9 PM57°FPartly Cloudy0%W 1 mph
Wed 10 PM56°FPartly Cloudy0%W 1 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Brentwood can differ.

7-day forecast

Tonight

Low 49°F

Mostly clear, with a low around 49. West wind around 2 mph.

Wednesday

High 70°F·Low 51°F

Sunny, with a high near 70. Northwest wind 2 to 6 mph.

Wednesday Night: Mostly cloudy, with a low around 51. West northwest wind around 2 mph.

Thursday

High 68°F·Low 51°F

Mostly cloudy, with a high near 68. North wind around 2 mph.

Thursday Night: Mostly cloudy, with a low around 51. West wind around 2 mph.

Friday

High 68°F·Low 48°F

Sunny, with a high near 68.

Friday Night: Partly cloudy, with a low around 48.

Saturday

High 64°F·Low 47°F

A slight chance of rain after 5pm. Partly sunny, with a high near 64.

Saturday Night: A slight chance of rain. Partly cloudy, with a low around 47.

Sunday

High 66°F·Low 48°F

A slight chance of rain before 10am. Sunny, with a high near 66.

Sunday Night: Mostly clear, with a low around 48.

Monday

High 67°F·Low 50°F

Mostly sunny, with a high near 67.

Monday Night: Partly cloudy, with a low around 50.

Tuesday

High 68°F

A chance of rain between 10am and 5pm. Mostly sunny, with a high near 68.

Nearby cities

Larger cities in the area

Other cities in Contra Costa County

See every city we cover in California, or check all active alerts.

About this forecast

Forecast office
Brentwood is served by the National Weather Service MTR forecast office, forecast zone CAZ510, county zone CAC013.
Location used
The Census Bureau's internal point for Brentwood (37.9356, -121.7190), in Contra Costa County. Population: 66,286 (2024 estimate), number 136 of the 296 California cities on this site.
Radar
Nearest NWS radar: KDAX. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/37.9356,-121.719 (forecast issued Oct 27, 3:07 PM PDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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