Isolated showers were expected in the Southland Tuesday morning as the region braced for another heat wave, which could create health risks and "elevated fire danger," forecasters said.
The week's highest temperatures were expected in valley areas from Wednesday through Friday, with highs reaching 106 degrees.
Overall, the month of August would be rounded out with hot weather, NBC4 Meteorologist Crystal Egger said.
"Today and tomorrow we'll see thunderstorms over our local mountains and across the high desert," she added. "A small chance, about 2 percent chance, that we'll get one in the inland valleys later today."
The heat -- the result of high pressure strengthening over the region -- "may result in an increase in heat-related illnesses, especially for the homeless, elderly, infants, outdoor workers and those participating in outdoor activities," warned an NWS statement. "The extended period of hot and dry conditions will also bring elevated fire danger."
The NWS forecast highs Tuesday of 75 in San Clemente; 78 in Newport Beach; 79 in Laguna Beach, Avalon and at LAX; 87 in Anaheim and Irvine; 88 in Long Beach and downtown L.A.; 87 in Anaheim; 88 on Mount Wilson; 89 in Mission Viejo; 90 in Fullerton; 91 in Yorba Linda; 94 in San Gabriel; 95 in Burbank; 97 in Pasadena; 100 in Saugus, Palmdale and Lancaster; and 101 in Woodland Hills.
Wednesday's temps will be a couple of degrees higher in many communities and rise slightly again Thursday. A cooling trend is expected Saturday, with temps averaging about the same as Tuesday's.
Downtown L.A. is forecast to be 88 Tuesday, 90 Wednesday, 93 Thursday and Friday, and 88 on Saturday, when the cooling trend will start. Woodland Hills is expected to be 101 Tuesday, 105 Wednesday, 106 Thursday and Friday, and 100 on Saturday.
Although the mercury will rise, heat records were not expected to be broken in Los Angeles County, but possible record-breaking temps could hit Ventura and Santa Barbara counties, according to NWS forecasters.