California · NWS LOX office

San Dimas, CA weather

It is 54°F at CLAREMONT as of Oct 28, 1:55 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, 2:24 AM PDT (snapshot)

Current conditions

Temperature

54°F

Patchy Fog

Wind

N 2 mph, gusts 5 mph

Humidity 80% · dew point 48°F

Pressure · visibility

—

Visibility —

Observed at CLAREMONT (CMOC1), Oct 28, 1:55 AM PDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the San Dimas forecast zone right now.

Around the NWS LOX forecast area

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

  • 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 San Dimas (local time)
TimeTempForecastPrecip. chanceWind
Wed 2 AM59°FPatchy Fog0% 0 mph
Wed 3 AM57°FPatchy Fog0% 0 mph
Wed 4 AM57°FPatchy Fog0% 0 mph
Wed 5 AM57°FPatchy Fog1% 0 mph
Wed 6 AM55°FPatchy Fog1% 0 mph
Wed 7 AM55°FPatchy Fog1% 0 mph
Wed 8 AM57°FPatchy Fog1% 0 mph
Wed 9 AM61°FPatchy Fog1% 0 mph
Wed 10 AM65°FPatchy Fog1% 0 mph
Wed 11 AM68°FMostly Sunny0% 0 mph
Wed 12 PM72°FMostly Sunny0% 0 mph
Wed 1 PM74°FMostly Sunny0% 0 mph
Wed 2 PM76°FMostly Sunny0%SW 5 mph
Wed 3 PM78°FMostly Sunny0%SW 5 mph
Wed 4 PM78°FMostly Sunny0%SW 5 mph
Wed 5 PM75°FMostly Sunny0%SW 5 mph
Wed 6 PM70°FPartly Cloudy0%SW 5 mph
Wed 7 PM66°FPartly Cloudy0%SW 5 mph
Wed 8 PM66°FPartly Cloudy0%WSW 5 mph
Wed 9 PM63°FPartly Cloudy0%WSW 5 mph
Wed 10 PM61°FPartly Cloudy0%WSW 5 mph
Wed 11 PM61°FPartly Cloudy0% 0 mph
Thu 12 AM59°FPartly Cloudy0% 0 mph
Thu 1 AM59°FPartly 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 San Dimas can differ.

7-day forecast

Overnight

Low 56°F

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

Wednesday

High 75°F·Low 56°F

Patchy fog before 11am. Partly sunny, with a high near 75. South southeast wind 0 to 5 mph.

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

Thursday

High 73°F·Low 57°F

Partly sunny, with a high near 73. South southwest wind 0 to 5 mph.

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

Friday

High 69°F·Low 55°F

Partly sunny, with a high near 69.

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

Saturday

High 68°F·Low 56°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 56.

Sunday

High 69°F·Low 53°F

A chance of rain showers before 4pm. Partly sunny, with a high near 69.

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

Monday

High 73°F·Low 55°F

Sunny, with a high near 73.

Monday Night: Mostly clear, with a low around 55.

Tuesday

High 74°F

Mostly sunny, with a high near 74.

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
San Dimas 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 San Dimas (34.1080, -117.8085), in Los Angeles County. Population: 33,226 (2024 estimate), number 226 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/34.108,-117.8085 (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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