NWS Forecast Office Los Angeles, CA

A long duration heat wave with record-breaking temperatures is possible next week for much of southwestern California as a strong upper level high pressure system expands westward from the desert southwest. There is the potential for high heat risk mainly for interior locations including the valleys and mountains Monday through at least Thursday, especially across Ventura and Los Angeles counties. It appears Wednesday will be the peak of the heat, when many interior locations could have the potential for very high heat risk. In addition to the possibility of several days of triple digit high temperatures, there is also the potential for very warm overnight low temperatures in the valleys, foothills and lower mountain elevations, which could exacerbate the overall heat risk. Sundowner winds will be possible for the Santa Barbara County south coast and Santa Ynez Mountains as well for several evenings next week, boosting temperatures there well into the 90s if not the century mark at times. The high heat will also result in elevated fire weather concerns across the region.