| National Weather Service Forecast for:
Union City CA Issued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: 7:35 pm PST Dec 4, 2025 | ||||||||||||||||||
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| Tonight |
Mostly clear, with a steady temperature around 45. Calm wind. |
| Friday |
Sunny, with a high near 62. Calm wind becoming west northwest around 6 mph in the afternoon. |
| Friday Night |
Partly cloudy, with a low around 46. Calm wind. |
| Saturday |
Sunny, with a high near 63. Calm wind becoming west northwest around 6 mph in the afternoon. |
| Saturday Night |
Partly cloudy, with a low around 47. Light and variable wind. |
| Sunday |
Patchy fog before 10am. Otherwise, partly sunny, with a high near 63. |
| Sunday Night |
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 47. |
| Monday |
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 64. |
| Monday Night |
Partly cloudy, with a low around 47. |
| Tuesday |
Mostly sunny, with a high near 65. |
| Tuesday Night |
Partly cloudy, with a low around 48. |
| Wednesday |
Mostly sunny, with a high near 66. |
| Wednesday Night |
Partly cloudy, with a low around 49. |
| Thursday |
Mostly sunny, with a high near 66. |
Forecast from NOAA-NWS for Union City CA.
