Port Costa, California Weather
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Weather Forecast for Port Costa, California : Contra Costa County
Issued: 1:26 pm PDT Sep 15, 2025 Latitude: 38.0463097 Longitude: -122.1833005 View on Google Maps

MouseOver for Detail Forecast
Tonight Tuesday Wednesday Thursday Friday Saturday Sunday Monday
Clear on Tonight Sunny on Tuesday Sunny on Wednesday Partly Sunny on Thursday 10% chance of rain on Friday 10% chance of rain on Saturday Sunny on Sunday Sunny on Monday
Low: 60°F High: 93°F High: 90°F High: 80°F High: 81°F High: 81°F High: 81°F High: 83°F
Low: 60°F Low: 61°F Low: 61°F Low: 60°F Low: 60°F Low: 59°F  
Clear Sunny Sunny Partly Sunny Rain Rain Sunny Sunny
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Current Conditions at
CONCORD - (KCCR)
73°
Clear
as of 10:53 PM PDST
Rel. Humidity: 49%
Dew Point: 54°F
Visibility: 10 Miles
Pressure: 29.86 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
NAPA - (KAPC)
68°
Clear
as of 10:54 PM PDST
Rel. Humidity: 77%
Dew Point: 61°F
Visibility: 10 Miles
Pressure: 29.86 in.
Flight Rule: VFR
Wind Data
6 MPH
160° South
Cloud Level(s): Clear
Current Conditions at
TRAVIS AFB - (KSUU)
68°
Clear
as of 10:55 PM PDST
Rel. Humidity: 56%
Dew Point: 52°F
Visibility: 10 Miles
Pressure: 29.82 in.
Flight Rule: VFR
Wind Data
7 MPH
200° South
Cloud Level(s): Clear
Current Conditions at
VACAVILLE - (KVCB)
68°
Clear
as of 10:53 PM PDST
Rel. Humidity: 52%
Dew Point: 50°F
Visibility: 10 Miles
Pressure: 29.84 in.
Flight Rule: VFR
Wind Data
3 MPH
280° West
Cloud Level(s): Clear
Clear on Tonight Tonight... Clear, with a low around 60. West southwest wind around 6 mph.
Sunny on Tuesday Tuesday... Sunny, with a high near 93. West southwest wind around 7 mph.
Clear on Tuesday Night Tuesday Night... Clear, with a low around 60. West southwest wind 7 to 9 mph.
Sunny on Wednesday Wednesday... Sunny, with a high near 90. West southwest wind 7 to 9 mph.
Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 61. Southwest wind 9 to 11 mph.
Partly Sunny on Thursday Thursday... Partly sunny, with a high near 80.
30% chance of thunderstorms Thursday Night Thursday Night... A slight chance of showers, then a chance of showers and thunderstorms after 11pm. Mostly cloudy, with a low around 61. Chance of precipitation is 30%.
10% chance of rain Friday Friday... A slight chance of showers. Mostly sunny, with a high near 81.
10% chance of rain Friday Night Friday Night... A slight chance of showers after 11pm. Partly cloudy, with a low around 60.
10% chance of rain Saturday Saturday... A slight chance of showers before 11am. Sunny, with a high near 81.
Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 60.
Sunny on Sunday Sunday... Sunny, with a high near 81.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 59.
Sunny on Monday Monday... Sunny, with a high near 83.
Current Radar Image


Sun Almanac for Port Costa, California
Sunrise: 06:52 AM
Sunset: 7:15 PM
Civil Sunrise:06:26 AM
Civil Sunset: 7:41 PM
Nautical Sunrise: 05:55 AM
Nautical Sunset: 8:12 PM
Astro Sunrise: 05:23 AM
Astro Sunset: 8:44 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.