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On Tuesday at 2:25 p.m. the NWS San Francisco CA issued a heat advisory in effect until Friday at 8 p.m. The advisory is for Marin Coastal Range, Sonoma Coastal Range, North Bay Interior Mountains, Coastal North Bay Including Point Reyes National Seashore, North Bay Interior Valleys, San Francisco Bay Shoreline, San Francisco Peninsula Coast, East Bay Interior Valleys, Santa Cruz Mountains, Santa Clara Valley Including San Jose, Eastern Santa Clara Hills, East Bay Hills, Southern Salinas Valley/Arroyo Seco and Lake San Antonio, Santa Lucia Mountains and Los Padres National Forest, Northern Salinas Valley/Hollister Valley and Carmel Valley, Northern Monterey Bay and Big Sur as well as San Francisco and Monterey counties.
“High temperatures in the low to mid 90s across the interior and 80s along the coastline,” can be expected according to the NWS. “Much above normal temperatures in the upper 80s to mid 90s are expected through the remainder of the week across the Bay Area and Central Coast. Portions of the interior Central Coast may reach the upper 90s starting mid to late week. Overnight lows in the upper 50s to low 60s will offer some relief to the lower elevations but will offer minimal relief within the higher elevations. Conditions will be much above normal along the coast this week but coastal residents may experience more relief overnight than those across the interior. The risk of heat related illnesses will increase with each additional day of heating from this event.”
“This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health systems and in heat-sensitive industries. Hot conditions can cause heat illnesses,” comments the NWS.
This advisory is in effect until Friday at 8 p.m.
Tips from the NWS for staying safe during a heat wave Stay hydrated: Keep yourself well-hydrated by drinking plenty of fluids.Find cool shelter: Stay in an air-conditioned room.Look out for others: Stay out of the sun, and check up on relatives and neighbors.Protect your little ones and furry friends: Never leave young children and pets alone in vehicles, especially during hot weather when car interiors can become dangerously hot in a matter of minutes.Exercise caution outdoors: If you work or spend time outside, take additional safety measures.Time your activities wisely: If possible, reschedule strenuous activities to early morning or evening when the heat is less intense.Be alert to warning signs: Educate yourself about the signs and symptoms of heat exhaustion and heat stroke.Stay cool with clothing: Select lightweight and loose-fitting outfits for enhanced comfort.
For a safer outdoor work environment, follow the Occupational Safety and Health Administration (OSHA)’s guidance by scheduling regular rest breaks in shaded or air-conditioned places. If anyone shows signs of heat illness, promptly move them to a cool, shaded area. In an emergency, call 911.
Source: The National Weather Service
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This story was originally published March 17, 2026 at 2:29 PM.