California Weather in September

September in California sees daytime temperatures around 26°C (79°F) and lows of 14°C (57°F) at night. With around 104 mm (4.1 in) of rainfall expected, it's worth packing a rain jacket.

Rainfall in California in September

The climate data from previous years indicates about 8 days of rain, averaging 104 mm (4.1 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in California in September

Daytime temperatures in California reach 26°C (79°F) in September, dropping to 14°C (57°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to around 14°C (57°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in California in September

The city usually sees around 230 hours of sunlight, indicating many sunny days — a great month for sightseeing.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, September and October typically offer the best weather for California.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our California's climate page.

California Temperature in September

Min Temperature 14°C (57°F)  

Max Temperature 26°C (79°F)  

Chance of Rain 27%  

Precipitation 104 mm (4.1 in)  

Rainy days 8 days  

Humidity 71% *  

Sunshine 230 hours *  

Percentage Sunshine 61% *  

* Data from: Columbia, the United States of America (41 KM, 25 Miles).

What to Wear in California in September

Warm but pleasant conditions in California in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in California in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our California's climate page.

More climate data for California

Temperature Rainfall Sunshine Humidity

See the full California climate overview or explore weather in the United States of America.