Port Costa, CA Weather Forecast
Local 7-day forecast
Partly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Port Costa, CA in one place.
Partly sunny. High near 72, with temperatures falling to around 68 in the afternoon. West northwest wind around 2 mph.
Local Weather Overview
This forecast page for Port Costa, CA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Nov 7, 2026 8:51 AM PST.
The active forecast window currently covers Nov 8 to Nov 13, 2026 for Port Costa, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Nov 8 to Nov 13, 2026
- Latest sync
- Nov 7, 2026 8:51 AM PST
- Forecast office
- MTR
- Source
- NOAA / NWS
Daily Outlook
This Week in Port Costa
Tuesday looks like the warmest upcoming period in Port Costa at 75 degrees F.
Friday Night is the coolest period ahead with temperatures near 48 degrees F.
The strongest winds are forecast for Friday at about 1 to 9 mph SW.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Nov 7, 2026 8:51 AM PST
- Coverage
- 7 days
- Time zone
- America/Los_Angeles
- Forecast office
- MTR
- Radar station
- KDAX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 49. South southwest wind around 1 mph.
Mostly sunny, with a high near 72. Northwest wind 0 to 3 mph.
Mostly clear, with a low around 50.
Sunny, with a high near 75.
Mostly clear, with a low around 50.
Sunny, with a high near 71.
A slight chance of rain after 4am. Partly cloudy, with a low around 50.
A slight chance of rain before 4pm. Mostly sunny, with a high near 66.
A chance of rain after 10pm. Partly cloudy, with a low around 49.
A chance of rain. Partly sunny, with a high near 64.
A chance of rain. Mostly cloudy, with a low around 48.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
Nov 8
|
Partly Sunny
|
72°F |
2 mph
WNW
|
|
Sunday Night
Nov 8
|
Partly Cloudy
|
49°F |
1 mph
SSW
|
|
Monday
Nov 9
|
Mostly Sunny
|
72°F |
0 to 3 mph
NW
|
|
Monday Night
Nov 9
|
Mostly Clear
|
50°F |
2 mph
NW
|
|
Tuesday
Nov 10
|
Sunny
|
75°F |
2 mph
NW
|
|
Tuesday Night
Nov 10
|
Mostly Clear
|
50°F |
1 mph
SW
|
|
Veterans Day
Nov 11
|
Sunny
|
71°F |
0 to 5 mph
ENE
|
|
Wednesday Night
Nov 11
|
Partly Cloudy then Slight Chance Light Rain
|
50°F |
0 to 3 mph
NE
|
|
Thursday
Nov 12
|
Slight Chance Light Rain
|
66°F |
0 to 5 mph
ENE
|
|
Thursday Night
Nov 12
|
Chance Light Rain
|
49°F |
3 mph
WSW
|
|
Friday
Nov 13
|
Chance Light Rain
|
64°F |
1 to 9 mph
SW
|
|
Friday Night
Nov 13
|
Chance Light Rain
|
48°F |
2 to 7 mph
SSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Port Costa.