California · NWS MTR office

Hercules, CA weather

It is 55°F at Berkeley Lab as of Oct 27, 10:45 PM PDT. Tonight: Mostly Clear then Patchy Fog, low near 50°F. Forecast from the National Weather Service, issued Oct 27, 3:07 PM PDT.

Updated Oct 27, 11:29 PM PDT (snapshot)

Current conditions

Temperature

55°F

Mostly Clear

Wind

ESE 2 mph, gusts 4 mph

Humidity 74% · dew point 47°F

Pressure · visibility

29.99 inHg

Visibility —

Observed at Berkeley Lab (LBNL1), Oct 27, 10:45 PM PDT. Station readings can lag or be missing.

Alerts for this area

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

Around the NWS MTR forecast area

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

  • 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 Hercules (local time)
TimeTempForecastPrecip. chanceWind
Tue 11 PM56°FMostly Clear0%WNW 2 mph
Wed 12 AM55°FMostly Clear0%NW 2 mph
Wed 1 AM54°FMostly Clear0%WNW 1 mph
Wed 2 AM53°FMostly Clear0%WNW 1 mph
Wed 3 AM52°FPatchy Fog0%NW 1 mph
Wed 4 AM52°FPatchy Fog0%NNW 1 mph
Wed 5 AM51°FPatchy Fog0%NNW 2 mph
Wed 6 AM51°FPatchy Fog0%NW 2 mph
Wed 7 AM50°FPatchy Fog0%NW 2 mph
Wed 8 AM50°FMostly Sunny0%NNW 2 mph
Wed 9 AM52°FPatchy Fog0%NNW 2 mph
Wed 10 AM55°FSunny0%NNW 1 mph
Wed 11 AM57°FSunny0%NW 1 mph
Wed 12 PM59°FSunny0%WNW 2 mph
Wed 1 PM61°FSunny0%W 2 mph
Wed 2 PM62°FSunny0%W 3 mph
Wed 3 PM63°FSunny0%WSW 3 mph
Wed 4 PM63°FSunny0%SW 5 mph
Wed 5 PM63°FSunny0%SW 5 mph
Wed 6 PM62°FMostly Clear0%SW 5 mph
Wed 7 PM61°FMostly Clear0%SW 5 mph
Wed 8 PM59°FPartly Cloudy0%W 1 mph
Wed 9 PM58°FPartly Cloudy0%W 1 mph
Wed 10 PM57°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 Hercules can differ.

7-day forecast

Tonight

Low 50°F

Patchy fog after 3am. Mostly clear, with a low around 50. Northwest wind around 2 mph.

Wednesday

High 64°F·Low 52°F

Patchy fog before 10am. Sunny, with a high near 64. West northwest wind 1 to 5 mph.

Wednesday Night: Patchy fog between 3am and 5am. Mostly cloudy, with a low around 52. Northwest wind 0 to 5 mph.

Thursday

High 61°F·Low 53°F

Mostly cloudy, with a high near 61. East northeast wind around 3 mph.

Thursday Night: Mostly cloudy, with a low around 53. West southwest wind around 5 mph.

Friday

High 61°F·Low 49°F

Sunny, with a high near 61.

Friday Night: Partly cloudy, with a low around 49.

Saturday

High 60°F·Low 48°F

A slight chance of rain after 5pm. Partly sunny, with a high near 60.

Saturday Night: A slight chance of rain before 4am. Partly cloudy, with a low around 48.

Sunday

High 63°F·Low 50°F

Sunny, with a high near 63.

Sunday Night: Mostly clear, with a low around 50.

Monday

High 65°F·Low 52°F

Mostly sunny, with a high near 65.

Monday Night: A slight chance of rain after 4am. Partly cloudy, with a low around 52.

Tuesday

High 64°F

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

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
Hercules 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 Hercules (38.0214, -122.2889), in Contra Costa County. Population: 26,499 (2024 estimate), number 261 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/38.0214,-122.2889 (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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