National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Extreme Heat Lingers; Severe Thunderstorms for Portions of the Plains and Southeast; Heavy Rainfall Threats

Gusty winds and heavy rainfall may impact the Big Island of Hawaii as a nearby tropical system passes west of the islands. From the Southwest U.S., Rockies and across the Gulf Coast, heavy rainfall could lead to isolated flash flooding. Severe thunderstorms are expected for areas of the Plains, Gulf Coast and Southeast through Tuesday. Extreme heat lingers for the southern Plains and Southwest. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

Lat: 38.2075°NLon: 122.27944°WElev: 33.0ft.

Clear

70°F

21°C

Humidity 64%
Wind Speed SSW 12 MPH
Barometer 29.99 in (1015.58 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 24 Aug 12:20 PM PDT
Extended Forecast for

3 Miles NNE Hercules CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 74. South wind 10 to 13 mph.

    High: 74 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 57. South southwest wind 7 to 10 mph.

    Low: 57 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Cloudy through mid morning, then gradual clearing, with a high near 78. Southwest wind 7 to 9 mph.

    High: 78 °F

    Gradual
    Clearing

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58. South southwest wind 7 to 9 mph.

    Low: 58 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 80. Southwest wind 6 to 8 mph.

    High: 80 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 74. South wind 10 to 13 mph.
Tonight
Partly cloudy, with a low around 57. South southwest wind 7 to 10 mph.
Tuesday
Cloudy through mid morning, then gradual clearing, with a high near 78. Southwest wind 7 to 9 mph.
Tuesday Night
Partly cloudy, with a low around 58. South southwest wind 7 to 9 mph.
Wednesday
Mostly sunny, with a high near 80. Southwest wind 6 to 8 mph.
Wednesday Night
Mostly clear, with a low around 61.
Thursday
Mostly sunny, with a high near 80.
Thursday Night
Partly cloudy, with a low around 59.
Friday
Mostly sunny, with a high near 74.
Friday Night
Mostly clear, with a low around 56.
Saturday
Mostly sunny, with a high near 73.
Saturday Night
Mostly clear, with a low around 56.
Sunday
Mostly sunny, with a high near 71.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE Hercules CA
 38.05°N 122.25°W (Elev. 56 ft)
Last Update:
11:27 am PDT Aug 24, 2026
Forecast Valid:
12pm PDT Aug 24, 2026-6pm PDT Aug 30, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation