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Union City, CA
7-Day Forecast
Updated 9/20/2026, 4:57 PM PDT
Weather Partner
Sun • Sep 20
Overcast
• Wind NW 8 mph
• Rain – 2% Chance
Low
57°
High
66°
Mon • Sep 21
Overcast
• Wind WNW 11 mph
• Rain – 1% Chance
Low
57°
High
68°
Tue • Sep 22
Fog
• Wind WNW 9 mph
• Rain – 1% Chance
Low
56°
High
81°
Wed • Sep 23
Mostly clear
• Wind WNW 8 mph
• Rain – 0% Chance
Low
60°
High
86°
Thu • Sep 24
Overcast
• Wind WNW 11 mph
• Rain – 0% Chance
Low
62°
High
80°
Fri • Sep 25
Clear
• Wind WNW 9 mph
• Rain – 0% Chance
Low
61°
High
81°
Sat • Sep 26
Partly cloudy
• Wind WNW 10 mph
• Rain – 0% Chance
Low
60°
High
78°
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