A prolonged heat wave officially arrives in Southern California today, bringing dangerously high temperatures to much of the region through early next week. The National Weather Service has issued a heat advisory for most inland communities beginning at 10 a.m. and lasting through Monday night. Forecasters expect daytime highs to range from 97 to 107 degrees, about 8 to 12 degrees above seasonal averages. Elevated humidity levels will make conditions feel even hotter and provide little overnight relief, with nighttime temperatures remaining in the 70s. Meteorologists warn the combination of extreme heat and warm nights will increase the risk of heat-related illnesses, especially for people working or exercising outdoors. Residents are encouraged to stay hydrated, limit strenuous activity during the hottest parts of the day, and check on vulnerable neighbors, children, and pets. Thursday is expected to be the hottest day of the week, with temperatures peaking across inland valleys and deserts.
