We've looked at the most up-to-date weather data for California, covering the last 12 years up to 2023, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about California weather in September.
How hot is it in California during September?
The temperature reaches around 34℃ during the daytime in September, falling away to 19℃ at night. The UV index will be high at this time of year, so protection against skin and eye damage is needed. Try to limit exposure between 10am and 4pm. Apply broad spectrum SPF 30+ sunscreen every few hours, even if it's cloudy, or more frequently after sweating or swimming, and wear UV-blocking sunglasses too, and bear in mind that bright surfaces, such as sand and water increase UV exposure.
Does it rain in California during September?
On average, in September you'll see rain on just one day in the month. In other words, you shouldn't see any of the wet stuff. You're not likely to see a thunderstorm during your trip.
Is it windy in California during September?
You're unlikely to experience any strong winds. Expect a light breeze that picks up slightly at times in September. With moderate humidity, any breeze will have a welcome cooling effect.
California Blog posts
From the top US travel bloggers
30th January 2023 by The Blonde AbroadStaying at Fieldtrip Casa Blanca in Joshua Tree
Are you dreaming of a desert getaway in Joshua Tree? We've found the perfect place for a family staycation and we want to share it with you!...
11th July 2022 by The Blonde AbroadThe best hotels to stay at in San Diego
Even though San Diego is home for me, I love planning staycations in â€œAmerican’s finest city.â€ I relish the opportunity to show people around my stomping grounds. That’s why I created my ultimate San Diego Travel Guide to help you get your bearings and plan your perfect San Diego itinerary. From the best restaurants in San Diego to the best brunch places in San Diego and everything in between, I encourage you to plan a trip to this coastal city. Find your new favorite brewery,...
29th March 2022 by The Blonde Abroad10 things to do in San Francisco (that aren’t the Golden Gate Bridge)Â
San Francisco is one of the true cultural capitals of the United States. Packed with world-class museums, a rich countercultural history, fabulous art galleries, and more wonders that you can explore in a lifetime, this city can truly be everything to everyone. Even if you’ve never explored the City by the Bay, you probably can name countless historical sites and iconic spots around town. Now, it’s time to dig deeper. Eat with the locals, travel off the beaten path, and see a fresh side of...
Weather in California
Our month-by-month guide to the weather and climate in California