The National Weather Service has issued an extreme heat warning that applies to more than 1 million people in San Diego County, mostly across inland valleys, foothills and mountains where high temperatures will approach or exceed 95 to 114 degrees.
The warning will be in effect until late Friday, although substantial relief might not arrive until late Saturday or early Sunday. There will be an elevated risk of wildfires countywide through Monday.
The temperature will be about 85 degrees at 1:10 p.m. Wednesday when the San Diego Padres take the field against the Pittsburgh Pirates at Petco Park.
A high pressure system will cause temperatures to moderately rise on Wednesday then soar on Thursday and Friday, forecasters say. The heat will be accompanied by very humid air across the entire county, including at local beaches, where temperatures will reach the mid-80s. Sea surface temperatures are in the 72 to 73 degree range.
San Diego’s daytime high has not fallen below average since July 10, and isn’t expected to do so through Sunday.
Humid air and warm seas making it hard for people across San Diego County to fall asleep
Forecasters believe that Thursday will be especially oppressive. They project the following daytime temperatures: Borrego Springs, 114; Ramona, 105; El Cajon, 104; Campo, 103; Escondido 102; Alpine, 102; Mira Mesa, 95; Julian, 95; San Ysidro, 90; San Diego, 88; Oceanside, 88.
Temperatures at 6 p.m. Tuesday
Poway, 92; Ramona, 92; Escondido 91; Gillespie Field, 90; Rancho Bernado, 89; La Mesa, 89; MCAS Miramar, 88; Brown Field, 84; Oceanside, 81; Carlsbad, 81.