Temperatures are forecast to reach above 100 degrees in some places, with a high of 105 degrees forecast inland.
Overnight temperatures on Saturday night are forecast to be in the 70s and 80s.
AccuWeather Forecast: Hotter today, even 80s at the beaches; high fire danger at the hills
AccuWeather Forecast: Hotter today, even 80s at the beaches; high fire danger at the hills
The heat can cause life-threatening conditions and is dangerous for most segments of the population, according to the Weather Service.
Do not leave people or pets in vehicles.
The Weather Service advised limiting outdoor activities to the afternoon or evening, staying hydrated and taking cooling breaks.