Isla Vista Weather in September

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

The climate in Isla Vista during September can be summarized as mild and very dry.

September is in the fall / autumn in Isla Vista and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 12°C (54°F) is normal.

Isla Vista weather averages (imperial / metric)
Daytime temperature 23.7°C 74.7°F
Nightly temperature 12.1°C 53.8°F
Average temperature 17.9°C 64.2°F
Daily sunshine 9.7 hrs
Avg rainfall 5 mm 0.2 ins
Rainy days 1 days
Sea temperature 17.5°C 63.6°F
Humidity 76%
Windspeed 10.8kph 7 mph

On average September is the 4th driest month of the year in Isla Vista 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 9.7 hours of sunshine per day.

September temperatures in Isla Vista

Isla Vista average temperature in September

September rainfall

Isla Vista average rain in September

September hourly sunshine

Isla Vista 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 Isla Vista 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

Isla Vista weather stats

Isla Vista weather statistics
Hottest month: August 23.6°C 74.5°F
Driest month: June 2mm 0.1ins
Sunniest month: April 10.7hrs
Coldest month: January 16.9°C 62.4°F
Wettest month: January 91mm 3.6ins
Map showing location of Isla Vista (34.41333, -119.86097) Isla Vista map pin © Google

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