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Placentia, CA Weather Forecast

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Placentia, CA Weather Forecast

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Placentia CA weather - Overcast - 70°F
Overcast
70°F
Updated 9:13 am
Feels Like 70°F
Humidity 73%
Wind N 0 mph
Barometer  29.98 in
Dew Point 61°F
Placentia CA weather - Overcast - 21°C
Overcast
21°C
Updated 9:13 am
Feels Like 21°C
Humidity 73%
Wind N 0 km/h
Barometer  101.5 kPa
Dew Point 16°C
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Placentia Weather Forecast

TODAY TONIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT
Placentia, CA Weather - Today Partly Cloudy Placentia, CA Weather - Tonight Partly Cloudy Placentia, CA Weather - Saturday Partly Cloudy Placentia, CA Weather - Saturday Night Mostly Cloudy Placentia, CA Weather - Sunday Partly Cloudy Placentia, CA Weather - Sunday Night Partly Cloudy Placentia, CA Weather - Monday Partly Cloudy Placentia, CA Weather - Monday Night Partly Cloudy Placentia, CA Weather - Tuesday Partly Cloudy Placentia, CA Weather - Tuesday Night Mostly Clear Placentia, CA Weather - Wednesday Partly Cloudy Placentia, CA Weather - Wednesday Night Mostly Clear
Partly Cloudy Partly Cloudy Partly Cloudy Mostly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Mostly Clear Partly Cloudy Mostly Clear
Hi: 80°FHi: 27°C
 Lo: 61°FLo: 16°C Hi: 80°FHi: 27°C
 Lo: 63°FLo: 17°C Hi: 80°FHi: 27°C
 Lo: 63°FLo: 17°C Hi: 78°FHi: 26°C
 Lo: 62°FLo: 17°C Hi: 80°FHi: 27°C
 Lo: 63°FLo: 17°C Hi: 81°FHi: 27°C
 Lo: 64°FLo: 18°C
POP = Probability of Precipitation.
Weather Outlook Updated: 1135 PM PDT Fri Sep 18 2026 Placentia, CA Weather - WeatherWorld.com

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Placentia Forecast Discussion

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Issued: 432 AM PDT Sat Sep 19 2026

Discussion

...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...

...UPDATED AVIATION DISCUSSION...

The 00z sounding Friday afternoon shows a well mixed marine boundary layer, around 3000 feet deep. Low clouds will be patchy overnight through the coastal basin and scatter out to the coast between 8-11 AM this morning.

While the coastal basin will maintain modest minimum relative humidity values (30-60% inland, 60-80% coast...