California weather

Our guide to the weather in California during September

34

Average high

6

UV Index

9mm

Monthly rainfall

31%

Humidity

We've looked at the most up-to-date weather data for California, covering the last 12 years up to 2024, 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.

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California Blog posts

From the UK's most popular travel bloggers

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Top California Destinations for Families to Enjoy

20th March 2024 by Two Monkey's Travel

California, often called the Golden State, offers an array of picturesque landscapes, thrilling amusement parks, and cultural experiences, making it a great destination for family trips. With its vast diversity, from the coast’s sandy beaches to the majestic mountains and bustling cities, there’s something for everyone in the family to enjoy....

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Cheapest places to holiday in September

1st July 2021 by John

If you’re planning a holiday for September, you’re in luck! It’s one of the best months of the year to travel, with mild weather in many of the world’s top locations and far fewer tourists to contend with for a spot on the sand. Best of all, you’ll see prices drop for accommodation, flights and even food, as the summer crowds leave to return home.Here’s a look at our top September destinations, so keep your eyes peeled for fantastic discounts on Travelscoop and pick your favourite...

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What is California Known For? 68 Things CA is Known For

8th January 2024 by PommieTravels

California, often referred to as the “Golden State”, is widely known for a number of iconic elements. It is renowned for its picturesque beaches which line the Pacific Ocean, and its sprawling and diverse landscapes which includes the towering Sierra Nevada mountains, vast deserts, and lush vineyards in Napa and Sonoma Valleys. California is the hotspot for the U.S. entertainment industry, hosting Hollywood, which is the world’s film and television hub. It’s also home to Silicon Valley,...

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6 Fun Things To Do In California

23rd November 2023 by The Rare Welsh Bit

While California is often praised for its immense, varied geography, there’s much more to this fascinating state than its visual landscapes. With a variety of fun activities on offer, you’ll never be short of things to see and do in California. Here are six fun things to do during your time here....

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How To Visit Salvation Mountain, California

23rd November 2023 by Hand Luggage Only

Salvation Mountain California is an artistic landscape that stands colourfully in the California Desert which I’m sure you’ll love! Erected over 30 years ago, this landscape has been created by volunteers that look after this one-of-a-kind spot. And to be honest, it’s easy to see why… it’s so unique....

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What food is California known for?

18th July 2023 by The World in My Pocket

Are you planning your first trip to the Golden State and wondering what food it is renowned for? Look no further! Having lived in California for many years and returning often, we have sampled food from all over the coast and discovered some of the best places to eat. From tacos to sushi, California has something to tantalise everyone's taste buds....

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5 Fun Things for Young Adults to Do in Los Angeles

20th June 2023 by PommieTravels

Los Angeles is a popular destination for young adults seeking novel and exciting experiences. With its vibrant nightlife in Downtown, stunning scenery and relaxed atmosphere of its beaches, it is the ideal place for those looking for fun in the sun and a good dose of rest and relaxation....

Weather in California

Our month-by-month guide to the weather and climate in California

14.8

California weather in

January
15.9

California weather in

February
18.4

California weather in

March
22.0

California weather in

April
26.6

California weather in

May
33.4

California weather in

June
37.5

California weather in

July
36.9

California weather in

August
33.8

California weather in

September
26.2

California weather in

October
18.8

California weather in

November
13.4

California weather in

December