Contrary to popular belief, Los Angeles' hottest average weather is NOT in July.

The hottest period in LA is typically from late August through mid September, with the hottest average week being the first week of September.

This year is true to that. There is presently a heat wave in LA, which started yesterday. However, what is unusual is the fact that it is affecting Nevada and Northern CA as well. Vegas, for example, has its hottest weather in mid-July, like most of the country.

Here's a list of high temps from today:

LA area:
Woodland Hills 109
Newhall 109
Downtown Los Angeles 98
Thousand Oaks 97
Encino 101
Anaheim 93
Malibu 76

Northern/Central CA:
Sacramento 105
Death Valley 120
Bakersfield 103
South Lake Tahoe 85
San Francisco 71

Nevada:
Las Vegas 111
Reno 99
Laughlin 111

Tomorrow is forecasted to be slightly hotter.

Note that a few places on the coast, such as SF and Malibu, are cool.

Where I am, which is often moderate in the summer, it was already 83 degrees at 6am (unusual), and reached around 100.