National Weather Service Forecast for: Union City CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:26 am PDT Jul 25, 2025
 
Overnight

Overnight: Cloudy, with a low around 58. West wind around 7 mph.
Cloudy
Friday

Friday: Cloudy through mid morning, then gradual clearing, with a high near 70. West northwest wind 5 to 14 mph, with gusts as high as 20 mph.
Becoming
Sunny
Friday
Night
Friday Night: Increasing clouds, with a low around 57. West southwest wind 6 to 14 mph, with gusts as high as 21 mph.
Increasing
Clouds
Saturday

Saturday: Cloudy through mid morning, then gradual clearing, with a high near 69. West wind 6 to 10 mph.
Gradual
Clearing
Saturday
Night
Saturday Night: Mostly cloudy, with a low around 57. West southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Mostly Cloudy
Sunday

Sunday: Mostly sunny, with a high near 73.
Mostly Sunny
Sunday
Night
Sunday Night: Partly cloudy, with a low around 55.
Partly Cloudy
Monday

Monday: Mostly sunny, with a high near 75.
Mostly Sunny
Monday
Night
Monday Night: Partly cloudy, with a low around 56.
Partly Cloudy
Lo 58 °F Hi 70 °F Lo 57 °F Hi 69 °F Lo 57 °F Hi 73 °F Lo 55 °F Hi 75 °F Lo 56 °F

 

Overnight
 
Cloudy, with a low around 58. West wind around 7 mph.
Friday
 
Cloudy through mid morning, then gradual clearing, with a high near 70. West northwest wind 5 to 14 mph, with gusts as high as 20 mph.
Friday Night
 
Increasing clouds, with a low around 57. West southwest wind 6 to 14 mph, with gusts as high as 21 mph.
Saturday
 
Cloudy through mid morning, then gradual clearing, with a high near 69. West wind 6 to 10 mph.
Saturday Night
 
Mostly cloudy, with a low around 57. West southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Sunday
 
Mostly sunny, with a high near 73.
Sunday Night
 
Partly cloudy, with a low around 55.
Monday
 
Mostly sunny, with a high near 75.
Monday Night
 
Partly cloudy, with a low around 56.
Tuesday
 
Mostly sunny, with a high near 75.
Tuesday Night
 
Partly cloudy, with a low around 56.
Wednesday
 
Mostly sunny, with a high near 73.
Wednesday Night
 
Partly cloudy, with a low around 57.
Thursday
 
Mostly sunny, with a high near 74.

 

Forecast from NOAA-NWS for Union City CA.