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Union Square Park Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY | SATURDAY NIGHT | SUNDAY |
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| Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers | Partly Cloudy | Mostly Clear | Mostly Clear | Chance of Rain | Chance of Rain |
| Hi: 60°FHi: 16°C | Lo: 53°FLo: 12°C | Hi: 60°FHi: 16°C | Lo: 55°FLo: 13°C | Hi: 60°FHi: 16°C | Lo: 55°FLo: 13°C | Hi: 60°FHi: 16°C | Lo: 53°FLo: 12°C | Hi: 65°FHi: 18°C Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C Lo: 55°FLo: 13°C | Hi: 65°FHi: 18°C Lo: 55°FLo: 13°C |
| POP: 70% | POP: 70% |
POP = Probability of Precipitation.
Weather Outlook Updated: 602 AM PDT Mon Oct 19 2026 
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Issued: 510 AM PDT Mon Oct 19 2026
Key Messages
Updated at 753 PM PDT Sun Oct 18 2026- Cooling trend continues through the end of the week
- Beneficial light rain showers expected mid-week
- Thunderstorms possible mid-week across southern Central Coast
Aviation
... (12Z TAFS) Issued at 507 AM PDT Mon Oct 19 2026
The marine layer is here, blanketing much of the region with stratus and MVFR ceilings. Expect the stratus to slowly trim back this morning, with coastal communities seeing clouds cling into the early afternoon. After that, VFR co...