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

Dangerous Heat over the South-Central and Southwest U.S. Through Next Week

Dangerous heat persists across the Desert Southwest through this weekend and across the Southern Plains and Lower Mississippi Valley through at least the middle of next week. Numerous daily record high temperatures are expected through at least Tuesday for much of Texas and Oklahoma as well as portions of Louisiana, New Mexico, and Arizona. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

60°F

16°C

Humidity 89%
Wind Speed SSW 9 MPH
Barometer 29.94 in (1013.89 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 23 Aug 01:54 AM PDT
Extended Forecast for

4 Miles NNE Hercules CA

  • Overnight

    Overnight: Partly cloudy, with a low around 58. South southwest wind around 7 mph.

    Low: 58 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, then gradually becoming sunny, with a high near 85. Light southwest wind becoming south southwest 5 to 10 mph in the morning.

    High: 85 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 58. South southwest wind 8 to 10 mph.

    Low: 58 °F

    Increasing
    Clouds

  • Monday

    Monday: Mostly cloudy through mid morning, then gradual clearing, with a high near 78. Southwest wind 9 to 11 mph.

    High: 78 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 57. West southwest wind 9 to 13 mph.

    Low: 57 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 80.

    High: 80 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 58. South southwest wind around 7 mph.
Sunday
Mostly cloudy, then gradually becoming sunny, with a high near 85. Light southwest wind becoming south southwest 5 to 10 mph in the morning.
Sunday Night
Increasing clouds, with a low around 58. South southwest wind 8 to 10 mph.
Monday
Mostly cloudy through mid morning, then gradual clearing, with a high near 78. Southwest wind 9 to 11 mph.
Monday Night
Partly cloudy, with a low around 57. West southwest wind 9 to 13 mph.
Tuesday
Partly sunny, with a high near 80.
Tuesday Night
Partly cloudy, with a low around 58.
Wednesday
Mostly sunny, with a high near 83.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
Mostly clear, with a low around 58.
Friday
Mostly sunny, with a high near 80.
Friday Night
Mostly clear, with a low around 58.
Saturday
Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE Hercules CA
 38.05°N 122.22°W (Elev. 62 ft)
Last Update:
1:46 am PDT Aug 23, 2026
Forecast Valid:
2am PDT Aug 23, 2026-6pm PDT Aug 29, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

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Chance of Precipitation