| National Weather Service Forecast for:
Union City CA Issued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: 12:46 am PDT Aug 20, 2026 | ||||||||||||||||||
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| Overnight |
Mostly cloudy, with a low around 59. Northwest wind around 5 mph. |
| Thursday |
Cloudy, then gradually becoming mostly sunny, with a high near 75. Light west northwest wind increasing to 5 to 10 mph in the morning. |
| Thursday Night |
Mostly cloudy, with a low around 59. Northwest wind 5 to 8 mph. |
| Friday |
Mostly cloudy, then gradually becoming sunny, with a high near 73. West northwest wind 5 to 10 mph, with gusts as high as 18 mph. |
| Friday Night |
Partly cloudy, with a low around 59. West wind 6 to 10 mph, with gusts as high as 18 mph. |
| Saturday |
Mostly sunny, with a high near 74. |
| Saturday Night |
Mostly clear, with a low around 58. |
| Sunday |
Mostly sunny, with a high near 76. |
| Sunday Night |
Partly cloudy, with a low around 58. |
| Monday |
Partly sunny, with a high near 74. |
| Monday Night |
Partly cloudy, with a low around 58. |
| Tuesday |
Partly sunny, with a high near 74. |
| Tuesday Night |
Partly cloudy, with a low around 58. |
| Wednesday |
Partly sunny, with a high near 76. |
Forecast from NOAA-NWS for Union City CA.
