SAN DIEGO (FOX 5/KUSI) -- An Excessive Heat Warning is in effect for San Diego County's inland valleys and the low deserts, according to the National Weather Service. This means dangerously hot conditions with temperatures between 90 to 100 degrees are expected. NWS said this is 10 to 20 degrees above normal. The low temperatures are only anticipated to drop between 65 and 75 degrees. Some of the impacted areas include the cities of Escondido, Poway, Santee, San Marcos, La Mesa and El Cajon. Borrego Springs and Ocotillo Wells are also included. This San Diego road is considered to be among the ‘most haunted’ in US (National Weather Service) Hotel Del Coronado workers vote ‘yes’ to authorize strike: what this means Weather officials have encouraged the public to drink plenty of fluids, stay in air-conditioned rooms if possible, stay out of the sun and check up on relatives and neighbors. Meanwhile, the region's mountain areas, such as Julian and Pine Valley, are under a Heat Advisory. In these areas, temperatures between 90 and 100 degrees can be expected throughout the weekend. The Excessive Heat Warning and Heat Advisory will both remain in place until 8 p.m. Monday.