California · NWS LOX office

Walnut, CA weather

It is 61°F at SANTA FE DAM as of Oct 28, 1:57 AM PDT. Overnight: Patchy Fog, low near 56°F. Forecast from the National Weather Service, issued Oct 28, 1:41 AM PDT.

Updated Oct 28, 2:26 AM PDT (snapshot)

Current conditions

Temperature

61°F

Patchy Fog

Wind

NE 4 mph, gusts 9 mph

Humidity 70% · dew point 51°F

Pressure · visibility

—

Visibility —

Observed at SANTA FE DAM (STFC1), Oct 28, 1:57 AM PDT. Station readings can lag or be missing.

Alerts for this area

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

Around the NWS LOX forecast area

1 active alert covers zones served by the LOX office near Walnut:

  • Coastal Flood Advisory

From the alert snapshot of Oct 28, 2026, 5:12 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 Walnut (local time)
TimeTempForecastPrecip. chanceWind
Wed 2 AM55°FPatchy Fog0% 0 mph
Wed 3 AM55°FPatchy Fog0% 0 mph
Wed 4 AM55°FPatchy Fog0% 0 mph
Wed 5 AM53°FPatchy Fog1%NE 5 mph
Wed 6 AM53°FPatchy Fog1%NE 5 mph
Wed 7 AM53°FPatchy Fog1%NE 5 mph
Wed 8 AM55°FPatchy Fog1% 0 mph
Wed 9 AM57°FPatchy Fog1% 0 mph
Wed 10 AM62°FPatchy Fog1% 0 mph
Wed 11 AM66°FMostly Sunny0% 0 mph
Wed 12 PM70°FMostly Sunny0% 0 mph
Wed 1 PM75°FMostly Sunny0% 0 mph
Wed 2 PM77°FMostly Sunny0%SW 5 mph
Wed 3 PM77°FMostly Sunny0%SW 5 mph
Wed 4 PM75°FMostly Sunny0%SW 5 mph
Wed 5 PM71°FMostly Sunny0%SW 5 mph
Wed 6 PM66°FPartly Cloudy0%SW 5 mph
Wed 7 PM64°FPartly Cloudy0%SW 5 mph
Wed 8 PM62°FPartly Cloudy0%WSW 5 mph
Wed 9 PM60°FPartly Cloudy0%WSW 5 mph
Wed 10 PM60°FPartly Cloudy0%WSW 5 mph
Wed 11 PM58°FMostly Cloudy0% 0 mph
Thu 12 AM58°FMostly Cloudy0% 0 mph
Thu 1 AM56°FMostly Cloudy0% 0 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 Walnut can differ.

7-day forecast

Overnight

Low 56°F

Patchy fog after 5am. Mostly cloudy, with a low around 56. East wind 0 to 5 mph.

Wednesday

High 76°F·Low 56°F

Patchy fog before 11am. Partly sunny, with a high near 76. Southeast wind 0 to 5 mph.

Wednesday Night: Mostly cloudy, with a low around 56. South wind 0 to 5 mph.

Thursday

High 74°F·Low 57°F

Partly sunny, with a high near 74. South wind 0 to 5 mph.

Thursday Night: Mostly cloudy, with a low around 57. South southwest wind 0 to 5 mph.

Friday

High 70°F·Low 55°F

Partly sunny, with a high near 70.

Friday Night: Mostly cloudy, with a low around 55.

Saturday

High 68°F·Low 55°F

A chance of rain showers after 5pm. Mostly cloudy, with a high near 68.

Saturday Night: Rain showers likely. Cloudy, with a low around 55.

Sunday

High 70°F·Low 53°F

A chance of rain showers before 4pm. Partly sunny, with a high near 70.

Sunday Night: Mostly clear, with a low around 53.

Monday

High 74°F·Low 54°F

Sunny, with a high near 74.

Monday Night: Mostly clear, with a low around 54.

Tuesday

High 75°F

Mostly sunny, with a high near 75.

Nearby cities

Larger cities in the area

Other cities in Los Angeles County

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

About this forecast

Forecast office
Walnut is served by the National Weather Service LOX forecast office, forecast zone CAZ548, county zone CAC037.
Location used
The Census Bureau's internal point for Walnut (34.0372, -117.8556), in Los Angeles County. Population: 27,250 (2024 estimate), number 255 of the 296 California cities on this site.
Radar
Nearest NWS radar: KSOX. 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/34.0372,-117.8556 (forecast issued Oct 28, 1:41 AM 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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