 through Nevada, California, and Arizona. Winds off the water are expected to fight off the worst heat from coastal cities like San Francisco, but strong and deepening high pressure ensures that areas from much of Arizona to the deserts of Southern California and through the Central Valley face the daily threat of highs exceeding 110 degrees by quite a bit in the hottest spots through the weekend, and parts of the Mojave Desert may even reach the 130-degree mark.