| National Weather Service Forecast for:
Union City CA Issued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: 11:26 pm PDT Jun 29, 2026 | ||||||||||||||||||
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| Tonight |
Mostly clear, with a low around 56. North northwest wind around 5 mph becoming calm after midnight. |
| Tuesday |
Sunny, with a high near 78. Light and variable wind becoming west northwest 6 to 11 mph in the afternoon. Winds could gust as high as 18 mph. |
| Tuesday Night |
Mostly clear, with a low around 55. West northwest wind 5 to 10 mph becoming south after midnight. |
| Wednesday |
Sunny, with a high near 75. South southeast wind 5 to 11 mph becoming west in the afternoon. Winds could gust as high as 21 mph. |
| Wednesday Night |
Partly cloudy, with a low around 55. West wind 8 to 13 mph becoming south southwest after midnight. Winds could gust as high as 21 mph. |
| Thursday |
Mostly sunny, with a high near 73. |
| Thursday Night |
Partly cloudy, with a low around 55. |
| Friday |
Mostly sunny, with a high near 76. |
| Friday Night |
Mostly clear, with a low around 56. |
| Independence Day |
Mostly sunny, with a high near 75. |
| Saturday Night |
Partly cloudy, with a low around 56. |
| Sunday |
Partly sunny, with a high near 74. |
| Sunday Night |
Partly cloudy, with a low around 56. |
| Monday |
Partly sunny, with a high near 72. |
Forecast from NOAA-NWS for Union City CA.
