Santa Ana Weather in September

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

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

September is in the fall / autumn in Santa Ana and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 27°C (81°F), whilst at night 16°C (60°F) is normal.

Santa Ana weather averages (imperial / metric)
Daytime temperature 27°C 80.6°F
Nightly temperature 15.6°C 60.1°F
Average temperature 21.3°C 70.3°F
Daily sunshine 9.9 hrs
Avg rainfall 5 mm 0.2 ins
Rainy days 1 days
Sea temperature 20.4°C 68.8°F
Humidity 69%
Windspeed 11.9kph 7 mph

On average September is the 5th driest month of the year in Santa Ana with around 5mm 0.2 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 9.9 hours of sunshine per day.

September temperatures in Santa Ana

Santa Ana average temperature in September

September rainfall

Santa Ana average rain in September

September hourly sunshine

Santa Ana 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 Santa Ana 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

Santa Ana weather stats

Santa Ana weather statistics
Hottest month: August 27.3°C 81.1°F
Driest month: July 1mm 0ins
Sunniest month: August 11.5hrs
Coldest month: January 18.9°C 66°F
Wettest month: January 66mm 2.6ins
Map showing location of Santa Ana (33.74557, -117.86783) Santa Ana map pin © Google

Locations nearby

Top United States locations