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Union City, CA Marine Weather Forecast

Tonight - 48°F
Feb 14, 2026
1 to 5 mph SW
Mostly Cloudy then Patchy Fog
Patchy fog after 3am. Mostly cloudy, with a low around 48. Southwest wind 1 to 5 mph.
Saturday - 56°F
Feb 14, 2026
1 to 13 mph SSW
Patchy Fog then Mostly Cloudy
Patchy fog before 9am. Mostly cloudy, with a high near 56. South southwest wind 1 to 13 mph.
Saturday Night - 52°F
Feb 14, 2026
15 mph S
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 4am. Mostly cloudy, with a low around 52. South wind around 15 mph, with gusts as high as 18 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Sunday - 56°F
Feb 15, 2026
14 to 18 mph SSE
Rain Showers
Rain showers. Mostly cloudy, with a high near 56. South southeast wind 14 to 18 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday Night - 50°F
Feb 15, 2026
7 to 15 mph SSE
Rain Showers
Rain showers. Cloudy, with a low around 50. South southeast wind 7 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Washington's Birthday - 51°F
Feb 16, 2026
7 to 22 mph SSE
Rain Showers
Rain showers before 4pm, then showers and thunderstorms. Cloudy, with a high near 51. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night - 45°F
Feb 16, 2026
21 to 25 mph SW
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a low around 45.
Tuesday - 47°F
Feb 17, 2026
23 mph SW
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a high near 47.
Tuesday Night - 44°F
Feb 17, 2026
8 to 23 mph SSW
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy, with a low around 44.
Wednesday - 48°F
Feb 18, 2026
7 to 16 mph WSW
Rain Showers Likely
Rain showers likely. Mostly cloudy, with a high near 48.
Wednesday Night - 43°F
Feb 18, 2026
6 to 16 mph SW
Rain Showers Likely
Rain showers likely. Mostly cloudy, with a low around 43.
Thursday - 51°F
Feb 19, 2026
6 to 15 mph ESE
Chance Rain Showers
A chance of rain showers. Partly sunny, with a high near 51.
Thursday Night - 44°F
Feb 19, 2026
5 to 15 mph W
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a low around 44.
Friday - 51°F
Feb 20, 2026
5 to 14 mph WNW
Chance Rain Showers
A chance of rain showers before 5pm. Partly sunny, with a high near 51.

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