UPDATE: Northern California placed under a heat advisory until Friday evening

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At 9:51 p.m. on Monday, the NWS San Francisco CA issued an updated 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 this 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," describes the NWS.

This advisory is in effect until Friday at 8 p.m.

NWS Heat Wave Safety Tips: Stay safe with these recommendations

• Stay hydrated: Keep yourself well-hydrated by drinking plenty of fluids.
• Seek cool shelter: Opt for an air-conditioned room to stay comfortable.
• Check on others: Stay out of the sun, and make sure to check up on relatives and neighbors.
• Child and pet welfare: Never forget to safeguard young children and pets by not leaving them unattended in vehicles, especially during scorching weather when car interiors can become life-threateningly hot.
• Exercise caution outdoors: If you work or spend time outside, take additional safety measures.
• Time your activities wisely: When possible, reschedule strenuous activities to early morning or evening.
• Know the red flags: Understand the signs and symptoms of heat exhaustion and heat stroke.
• Dress comfortably: Wear lightweight and loose-fitting clothing.

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 14, 2026 at 12:59 PM.