An updated heat advisory was released by the National Weather Service on Thursday at 9:35 p.m. in effect until Friday Aug. 22, at 10 p.m. for Santa Cruz Mountains.
The NWS San Francisco CA adds to prepare for, “Daytime temperatures in the 90s with nighttime temperatures ranging from upper 50s in San Mateo County to mid 70s along the ridge.”
“Hot conditions can cause heat illnesses. 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,” the NWS said.

Tips from the NWS for staying safe during a heat wave
- Stay hydrated: Keep yourself well-hydrated by drinking plenty of fluids.
- Seek cool shelter: Opt for an air-conditioned room to stay comfortable.
- Avoid sun exposure: Stay out of the sun, and make sure to check up on relatives and neighbors.
- Child and pet safety: Do not leave young children and pets unattended in vehicles when car interiors can reach lethal temperatures in a matter of minutes.
- Caution outdoors: If you must work or spend time outdoors, take extra precautions.
- Select the ideal time: If possible, move strenuous activities to early morning or evening for more favorable conditions.
- Recognize heat-related issues: Familiarize yourself with warning signs and how to recognize the symptoms of heat exhaustion and heat stroke.
- Stay cool with clothing: Wear lightweight, loose-fitting clothing to stay comfortable.
Additional tips for outdoor workers:
- The Occupational Safety and Health Administration (OSHA) recommends frequent rest breaks in shaded or air-conditioned areas for outdoor workers.
- If someone succumbs to the heat, promptly relocate them to a cool, shaded location.
- In emergency situations, dial 911 for immediate assistance.
These NWS heat safety directives are essential for safeguarding your well-being when facing high temperatures. Stay well-informed and take the necessary precautions to shield yourself and others from the potential hazards of extreme heat.