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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?

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"Southwest USA" is a huge place, and encompasses many different temperate zones. Even the state of California is vast, with different weather conditions. Your best bet is to look up historical weather data for the city(ies) where you will be visiting. –  Flimzy Jun 24 at 20:14
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@Flimzy I've given the itinerary of the trip. Roughly the triangle SF, Vegas, LA. I'm not looking for 1-mile precision. I did some research, but it is very hard to judge from numbers. An indication what if feels like, from people, is much more useful. –  Tonny Jun 24 at 21:06

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up vote 4 down vote accepted

Temperature: the hottest place you've listed is Death Valley: expect temperatures as high as 120°F (49°C) in the shade! Next highest would be Las Vegas between 90°F (32°C) and 100°F (43°C). California will mostly be between 80°F (30°C) and 100°F (43°C) except for parts of coast and the San Francisco bay, which can be down below 70°F (24°C) in fog! The joke is that you can spot tourists walking the Golden Gate Bridge in San Francisco sweatshirts (which they just bought) and shorts! Note that although the temperatures are high during the day, the humidity is quite low (except when foggy) and so can be more comfortable than it sounds. Never the less, places like Death Valley can easily kill you if you're not careful!

You can expect the nights to be 10-20°F (6-12°C) cooler.

Rainfall: for the most part, California and Nevada get no rainfall from sometime in May through October! However, it is possible to have thunderstorms create flash floods in the desert.

FYI, I'm a California native and have lived here my entire life (59 years).

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Thank you very much. A little bit hotter than I expected. –  Tonny Jun 25 at 10:57
    
There's a reason Death Valley is called that. You don't live long out there without water. –  Loren Pechtel Jun 25 at 17:35

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