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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 - 83°F
Clear
83°F
Updated 12:09 pm
Feels Like 83°F
Humidity 34%
Wind W 10 mph
Barometer  29.9 in
Dew Point 52°F
Union Square CA weather - Clear - 28°C
Clear
28°C
Updated 12:09 pm
Feels Like 28°C
Humidity 34%
Wind W 16 km/h
Barometer  101.3 kPa
Dew Point 11°C
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Union Square Weather Forecast

TODAY TONIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY THURSDAY FRIDAY
Union Square, CA Weather - Today Sunny Union Square, CA Weather - Tonight 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 Clear Union Square, CA Weather - Wednesday Clear Union Square, CA Weather - Thursday Clear Union Square, CA Weather - Friday Clear
Sunny Clear Sunny Clear Sunny Clear Sunny Clear Clear Clear Clear
Hi: 88°FHi: 31°C
 Lo: 56°FLo: 13°C Hi: 82°FHi: 28°C
 Lo: 56°FLo: 13°C Hi: 88°FHi: 31°C
 Lo: 57°FLo: 14°C Hi: 90°FHi: 32°C
 Hi: 90°FHi: 32°C
Lo: 59°FLo: 15°C		 Hi: 90°FHi: 32°C
Lo: 59°FLo: 15°C		 Hi: 90°FHi: 32°C
Lo: 59°FLo: 15°C		 Hi: 90°FHi: 32°C
Lo: 59°FLo: 15°C
POP = Probability of Precipitation.
Weather Outlook Updated: 1132 AM PDT Sat Sep 12 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 ...