Expect another 100-degree day in many Southern California communities with slight cooling on the way

LOS ANGELES — Some Southland communities will continue to wilt in 100-degree weather Monday as the region’s first heat wave of summer 2019 enters its fifth day.

A heat advisory issued by the NWS will go into effect at 10 a.m. Monday in the San Fernando, Santa Clarita and San Gabriel valleys and the Santa Monica Mountains Recreational area. It will expire at 8 p.m. Monday.

“The heat will create a dangerous situation in which heat illnesses are possible, especially for the elderly and for people working outdoors,” warned the NWS in issuing the heat advisory.

The National Weather Service forecast a combination of partly cloudy and sunny skies in L.A. County, along with highs of 77 degrees in Avalon, San Pedro, Torrance and at LAX; 87 in downtown L.A. and Long Beach; 89 on Mount Wilson; 93 in Whittier; 96 in North Hollywood; 97 in Pasadena; 98 in West Covina; 100 in Sherman Oaks; 101 in Palmdale and Van Nuys; 102 in Santa Clarita and Lancaster; and 103 in Reseda, Northridge and Woodland Hills.

Tuesday’s temperatures will be the same as Monday’s in some locations but slight cooler in others. Woodland Hills, for instance, is forecast to hit 98.

The NWS forecast sunny skies in Orange County Monday and highs of 74 in San Clemente; 75 in Newport Beach and Laguna Beach; 81 on Santiago Peak; 86 in Santa Ana; 87 on Ortega Highway at 2,600 feet; 90 in Anaheim; 91 in Mission Viejo; 92 in Fremont Canyon; and 93 in Trabuco Canyon.

Tuesday’s temperatures in Orange County mostly will be marginally lower.