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Union, California Weather Forecast
Union, California Weather
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Weather Forecast for Union, California : San Luis Obispo County
Issued: 1:06 pm PST Dec 18, 2025 Latitude: 35.6374701 Longitude: -120.5609977 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Friday Saturday Sunday Monday Tuesday Wednesday
Sunny on This Afternoon Patchy Fog on Tonight Morning Fog on Friday Mostly Sunny on Saturday 30% chance of rain on Sunday 20% chance of rain on Monday Rain on Tuesday Rain on Wednesday
High: 67°F Low: 40°F High: 66°F High: 67°F High: 63°F High: 63°F High: 60°F High: 57°F
Low: 42°F Low: 50°F Low: 50°F Low: 48°F Low: 49°F  
Sunny Patchy Fog Morning Fog Mostly Sunny Rain Rain Rain Rain
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Current Conditions at
PASO ROBLES - (KPRB)
63°
Clear
as of 12:53 PM PST
Rel. Humidity: 67%
Dew Point: 52°F
Visibility: 10 Miles
Pressure: 30.14 in.
Flight Rule: VFR
Wind Data
5 MPH
110° East
Cloud Level(s): Clear
Current Conditions at
SANTA MARIA - (KSMX)
66°
Clear
as of 12:51 PM PST
Rel. Humidity: 68%
Dew Point: 55°F
Visibility: 10 Miles
Pressure: 30.04 in.
Flight Rule: VFR
Wind Data
20 MPH
290° West
Cloud Level(s): Clear
Sunny on This Afternoon This Afternoon... Sunny, with a high near 67. East northeast wind around 10 mph, with gusts as high as 15 mph.
Patchy Fog on Tonight Tonight... Patchy fog after 10pm. Otherwise, increasing clouds, with a low around 40. East northeast wind 5 to 10 mph becoming north northwest after midnight.
Morning Fog on Friday Friday... Patchy fog before 10am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 66. Northeast wind 5 to 10 mph becoming west northwest in the afternoon.
Mostly Clear on Friday Night Friday Night... Mostly clear, with a low around 42. North northwest wind around 5 mph becoming east after midnight.
Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 67. East northeast wind 5 to 10 mph.
10% chance of rain Saturday Night Saturday Night... A 10 percent chance of showers after 4am. Mostly cloudy, with a low around 50.
30% chance of rain Sunday Sunday... A 30 percent chance of showers, mainly after 10am. Cloudy, with a high near 63.
20% chance of rain Sunday Night Sunday Night... A chance of showers, mainly before 10pm. Cloudy, with a low around 50.
20% chance of rain Monday Monday... A chance of showers, mainly after 10am. Cloudy, with a high near 63.
20% chance of rain Monday Night Monday Night... A chance of showers. Cloudy, with a low around 48.
Rain on Tuesday Tuesday... Showers likely. Cloudy, with a high near 60.
Rain on Tuesday Night Tuesday Night... Showers. Cloudy, with a low around 49.
Rain on Wednesday Wednesday... Showers. Cloudy, with a high near 57.
Current Radar Image


Sun Almanac for Union, California
Sunrise: 07:07 AM
Sunset: 4:51 PM
Civil Sunrise:06:38 AM
Civil Sunset: 5:20 PM
Nautical Sunrise: 06:06 AM
Nautical Sunset: 5:52 PM
Astro Sunrise: 05:35 AM
Astro Sunset: 6:23 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.