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Hercules, CA Weather

Tonight: Mostly Cloudy, low 50°F. Hourly and 10-day forecast from the National Weather Service. Times are local (PDT).

Hercules, CA current weather

No recent observation or forecast for this location right now. Please check again in a few minutes.

10-day forecast

Tap a day for details

  • Today10/30Low 50°High

    Tonight: Mostly cloudy, with a low around 50. Southwest wind around 6 mph.

    Mostly Cloudy
  • Sat10/3129% chance of precipitationLow 48°High 61°

    Saturday: Partly sunny, with a high near 61. Southwest wind 3 to 8 mph.

    Saturday Night: A chance of rain showers between 1am and 4am. Partly cloudy, with a low around 48. West wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.

    Partly Sunny
  • Sun11/1Low 47°High 64°

    Sunday: Sunny, with a high near 64. Northwest wind 2 to 6 mph.

    Sunday Night: Mostly clear, with a low around 47. North northwest wind around 3 mph.

    Sunny
  • Mon11/2Low 47°High 65°

    Monday: Mostly sunny, with a high near 65.

    Monday Night: Mostly cloudy, with a low around 47.

    Mostly Sunny
  • Tue11/321% chance of precipitationLow 49°High 65°

    Tuesday: A slight chance of rain between 10am and 4pm. Mostly sunny, with a high near 65.

    Tuesday Night: Mostly cloudy, with a low around 49.

    Slight Chance Light Rain
  • Wed11/420% chance of precipitationLow 49°High 65°

    Wednesday: Partly sunny, with a high near 65.

    Wednesday Night: A slight chance of rain after 4am. Mostly cloudy, with a low around 49.

    Partly Sunny
  • Thu11/521% chance of precipitationLow 50°High 63°

    Thursday: A slight chance of rain. Mostly sunny, with a high near 63.

    Thursday Night: A slight chance of rain before 10pm. Partly cloudy, with a low around 50.

    Slight Chance Light Rain
  • Fri11/612% chance of precipitationLow High 65°

    Friday: Mostly sunny, with a high near 65.

    Mostly Sunny
  • Sat11/7Model blendLow 50°High 71°

    Saturday: Mostly sunny. High near 71°. Low that night near 50°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

  • Sun11/8Model blendLow 51°High 69°

    Sunday: Partly cloudy. High near 69°. Low that night near 51°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

Forecast for 38.010, -122.271 from the NWS MTR office, updated 10/30/2026, 1:26 PM PT · Official forecast on weather.gov

Days 9 to 10: NOAA National Blend of Models, station KCCR (Concord/Buchanan Fld, 12 mi), model run 10/30/2026, 1:00 PM PDT

From the National Weather Service; may be delayed. Not for life-safety decisions. In an emergency, call 911.

Radar and satellite

National radar

NEXRAD (up to 24 hours) and GOES

Latest

Frequently asked questions

What is the 10-day forecast for Hercules, CA?
The first 8 days come from the National Weather Service forecast. Days 9 to 10 (Nov 7 to Nov 8) come from the NOAA National Blend of Models, with highs of 69°F to 71°F. Model guidance this far out often changes.
What time is sunrise and sunset in Hercules, CA today?
Sunrise is about 7:33 AM PDT and sunset is about 6:12 PM PDT (calculated for the center of the area, within a few minutes).
What is the normal October weather in Hercules, CA?
At Vallejo, the 1991 to 2020 normal high in October is 79°F and the normal low is 54°F.

Rain and snow totals

Next 3 days, NWS forecast grid

Rain (liquid)
0.02 in
Snow
0.00 in
Ice
0.00 in

Nearby hazards

California hazards

Severe storm and flash flood outlooks, expected rain, river flooding and wildfires near this area

  • Severe storm outlook today:No thunderstorm risk area over this locationOutlook map
  • Excessive rainfall outlook (flash flood risk):Could not check the Weather Prediction Center outlook right now.
  • River gauges within 40 miles at or above flood stage: None reported
  • Active wildfires within 50 miles: None reported

UV and air quality forecast

EPA and AirNow

AQI forecast tomorrow (Concord)
50GoodPM2.5
AQI forecast tomorrow (Concord)
44GoodPM2.5

UV index guide · Air quality

Drought

By county

Contra Costa County, week of 10/27/2026

No drought or abnormal dryness in this county.

Tides nearby

NOAA tide stations

Beaches nearby

EPA BEACON beaches

Sun and moon

Local time, center of the area

Sunrise
7:33 AM
Sunset
6:12 PM
Daylight
10 hr 39 min
Moon
Waning Gibbous 75% lit
First light (civil dawn)
7:05 AM
Last light (civil dusk)
6:39 PM
Moonrise
10:03 PM
Moonset
12:48 PM

Normal October weather

Climate

Normal October high 79°, low 54°, precipitation 1.02 in for the month. 1991 to 2020 normals at Vallejo, 8 mi away.

Other places nearby

Data sources

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About this data

Weather and emergencies: Weather, air quality and hazard information on this page is delayed and may be incomplete. It is not a substitute for official warnings. Always follow the National Weather Service, local emergency management and public safety officials. In an emergency, call 911. For evacuation orders, use your local official alert system.

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