What sort of weather to expect in Southwest USA in September

I'll be making a 3 week holiday trip (San Francisco, Las Vegas, Los Angeles) in September.
Organized trip by touring car in a 18-20 person group with guide.
Couple of days in those 3 cities. Visiting the National Parks in between.
(Among others: Grand Canyon, Joshua Tree, Death Valley, the usual stuff.)

As I am European I don't have a good idea of Southwest USA weather during that month.
I'm wondering what sort of clothes to bring.
What sort of temperatures can I expect? Should I expect serious rain-fall?

usa weather-and-climate

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What is the best time of year to visit the Southwest?

Overall, spring is a much more pleasant (and safer) time for both sightseeing and active trips. Plus, some parks such as the Grand Canyon, Zion, and Bryce receive fewer visitors in the spring than summer, making it easier to get around and make bookings.

What is the weather like in USA in September?

USA weather September The USA enjoys a beautiful climate in September with plenty of warm sunshine and clear blue skies for most of the month. Florida is very hot at this time of year, with temperatures climbing to the mid-thirties at peak times of the day while New York has slightly cooler temperatures in the summer.

Where in the US is the best weather in September?

If you're planning an early fall getaway, you'll want to check out these five cities that have perfect weather in September.

San Diego, California. Credit: Ron and Patty Thomas/ iStock. ...
Santa Fe, New Mexico. Credit: DenisTangneyJr/ iStock. ...
Portland, Maine. Credit: Sean Pavone/ iStock. ...
Boston, Massachusetts.

What is the climate like in the Southwest region?

The climate of the Southwest is most influenced by its geographic location between the mid-latitude and subtropical atmospheric circulation regimes. This positioning leads to year-round warm temperatures, low annual precipitation, and clear skies.

September 2021 Southwest Drought Briefing

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Pixabay, Airam Dato-on, Galyna Lunina, Liza Summer