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Union Square, CA Weather Forecast

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Union Square, CA Weather Forecast

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Union Square CA weather - Clear - 87°F
Clear
87°F
Updated 7:40 pm
Feels Like 76°F
Humidity 33%
Wind W 12 mph
Barometer  29.78 in
Dew Point 55°F
Union Square CA weather - Clear - 31°C
Clear
31°C
Updated 7:40 pm
Feels Like 25°C
Humidity 33%
Wind W 19 km/h
Barometer  100.8 kPa
Dew Point 13°C
WX Settings

Union Square Weather Forecast

TONIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY THURSDAY FRIDAY
Union Square, CA Weather - Tonight Clear Union Square, CA Weather - Saturday Sunny Union Square, CA Weather - Saturday Night Clear Union Square, CA Weather - Sunday Sunny Union Square, CA Weather - Sunday Night Clear Union Square, CA Weather - Monday Sunny Union Square, CA Weather - Monday Night Clear Union Square, CA Weather - Tuesday Sunny Union Square, CA Weather - Tuesday Night Mostly Clear Union Square, CA Weather - Wednesday Clear Union Square, CA Weather - Thursday Clear Union Square, CA Weather - Friday Mostly Sunny
Clear Sunny Clear Sunny Clear Sunny Clear Sunny Mostly Clear Clear Clear Mostly Sunny
Lo: 61°FLo: 16°C Hi: 87°FHi: 31°C
 Lo: 57°FLo: 14°C Hi: 83°FHi: 28°C
 Lo: 56°FLo: 13°C Hi: 88°FHi: 31°C
 Lo: 56°FLo: 13°C Hi: 89°FHi: 32°C
 Lo: 57°FLo: 14°C Hi: 88°FHi: 31°C
Lo: 58°FLo: 14°C		 Hi: 88°FHi: 31°C
Lo: 58°FLo: 14°C		 Hi: 87°FHi: 31°C
POP = Probability of Precipitation.
Weather Outlook Updated: 201 PM PDT Fri Sep 11 2026 Union Square, CA Weather - WeatherWorld.com

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Issued: 1158 AM PDT Fri Sep 11 2026

Key Messages

  • Renewed fire weather conditions over the weekend and into early next week due to gusty winds and low daytime humidity
  • Red Flag Warning in place for portions of northern California from 11 AM PDT Saturday through 11 AM PDT Monday
  • Notable cool down over the weekend, with near to below normal temperatures expected

Discussion

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Today-Monday: Mostly clear skies observable today, though as onshore flow increases and the ridging of the past few days breaks down, temperatures are expected to ...