Placentia Weather in September

What's the weather like in Placentia (California) in September 2025?

The climate in Placentia during September can be summarized as warm and very dry.

September is in the fall / autumn in Placentia and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 29°C (84°F), whilst at night 15°C (60°F) is normal.

Placentia weather averages (imperial / metric)
Daytime temperature 28.8°C 83.8°F
Nightly temperature 15.4°C 59.7°F
Average temperature 22.1°C 71.8°F
Daily sunshine 10 hrs
Avg rainfall 8 mm 0.3 ins
Rainy days 2 days
Sea temperature 20.4°C 68.8°F
Humidity 67%
Windspeed 12.2kph 8 mph

On average September is the 6th driest month of the year in Placentia with around 8mm 0.3 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 10 hours of sunshine per day.

September temperatures in Placentia

Placentia average temperature in September

September rainfall

Placentia average rain in September

September hourly sunshine

Placentia average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Placentia in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Placentia weather stats

Placentia weather statistics
Hottest month: August 29.8°C 85.6°F
Driest month: July 1mm 0ins
Sunniest month: August 11.7hrs
Coldest month: January 19.3°C 66.7°F
Wettest month: January 82mm 3.2ins
Map showing location of Placentia (33.87224, -117.87034) Placentia map pin © Google

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