It’s finally expected to cool down in Southern California this weekend after a scorching heat wave this week broke temperature records across the region. Temperatures are forecast to be in the mid-80s along the coast and low to mid-90s everywhere else most of next week. “It’s not normal for this kind of year to have this kind of heat, where it’s 20 to 30 degrees above normal. Friday is the last day of the significant heat wave, with temperatures in the 90s and low triple digits in the inland valley areas, according to Lewis. Heat exhaustion and dehydration could result from the heat wave, especially during this time of year, when the temperatures are normally around 70 degrees, according to Lewis.