SAN FRANCISCO (KRON) -- An excessive heat warning has been issued for San Francisco, with the National Weather Service warning of "dangerous, life-threatening heat." Temperatures in the city are expected to hit the mid-90s Tuesday as a heat wave envelopes the Bay Area. The excessive heat warning goes into effect at 10 a.m. Tuesday and lasts through 11 p.m. Wednesday. Coastal highs are expected to hit the mid-90s with the highest temperatures expected in the city's eastern neighborhoods. 3 Bay Area school districts among best in America: Niche The San Francisco Department of Emergency Management is urging residents to be heat aware. Precautions recommended by the SF DEM include drinking plenty of water and avoiding alcohol, caffeine, and sports drinks with excess sugar. With indoor temperatures potentially climbing 10 degrees higher than outdoor temperatures, the DEM recommends frequently checking on family and friends, especially those who live alone or are vulnerable to heat illness. The DEM further recommends recognizing the signs of heat illness, which include: Dizziness Excessive sweating Nausea Altered mental state or loss of consciousness If you are planning on being outdoors, the SF DEM recommends staying under trees, bringing a pop-up canopy or umbrella with you and having plenty of water. San Francisco cooling centers Cooling centers will be available in the following places: Main Library -- 100 Larkin Street Chinatown/Him Mark Lai Branch Library -- 1135 Powell Street Glen Park Branch Library -- 2825 Diamond Street Mission Bay Branch Library -- 960 4th Street North Beach Branch Library -- 850 Columbus Avenue Potrero Hill Branch Library -- 1616 20th Street The National Weather Service advises residents to limit outdoor activities during the afternoon hours, stay hydrated and take cooling breaks, and to never leave people or pets in vehicles.