Portions of San Diego County will be under a heat advisory again Monday as temperatures soar 10 to 20 degrees above average, but forecasters said the unseasonably hot weather should begin to slightly cool off Tuesday.
A National Weather Service heat advisory for the coast and the valleys is scheduled to remain in effect from 11 a.m. until 6 p.m. as a strong and nearly stationary ridge of high pressure pushes high temperatures well above normal. High temperatures are expected to range from 90 to 95 degrees near the coast, 95 to 100 degrees inland and in the western valleys, and 89 to 94 degrees near the foothills.
Elsewhere in the county, partly cloudy conditions are in the forecast along with high temperatures of 81 to 91 degrees in the mountains and around 98 in the deserts.
"High pressure aloft and weak offshore flow will continue hot weather with well above average high temperatures for inland coastal and western valley areas today," according to the weather service.
Cooler temperatures are expected to begin Tuesday, and will be followed by the possibility of showers and thunderstorms Wednesday and Thursday as a low pressure system moves inland across the region, forecasters said.
"However, the cooling will limited, with high temperatures only falling to around 5 degrees above seasonal averages by Friday," according to the National Weather Service. "A slight chance for showers and thunderstorms will arrive by the middle of the week."
The National Weather Service was urging residents to protect themselves and their loved ones against dehydration, heat stroke and other heat-related illnesses. They were advised to stay well-hydrated, avoid working in the sun, check on neighbors and relatives — especially the elderly — and provide plenty of water to pets and livestock.
Authorities also warned against leaving children or pets in parked cars, which can quickly become death traps in high heat.
