The National Weather Service (NWS) in San Francisco has issued a heat advisory set to take effect on Monday at 10 AM and lasting until Friday, March 20th at 8 PM. This warning encompasses a large area of Northern California, including the Bay Area, coastal regions, and the Central Coast, as well as the interior valleys. Residents in these areas can anticipate temperatures soaring into the low to mid-90s, while coastal regions will experience highs in the 80s, significantly above the seasonal average. By the middle to late week, some inland areas may reach the upper 90s. Although overnight temperatures will drop to the upper 50s and low 60s, providing some respite for lower elevations, those in higher altitudes should not expect much cooling at night. The NWS cautioned that the likelihood of heat-related illnesses will rise with each day of extreme temperatures.

Affected Regions Overview A Look at the List of Affected Areas

The advisory impacts numerous regions, including the 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, East Bay Hills, Santa Cruz Mountains, Santa Clara Valley (including San Jose), Eastern Santa Clara Hills, Northern Monterey Bay, Northern Salinas Valley, Southern Salinas Valley, Hollister Valley, Carmel Valley, Southern Monterey Bay, Big Sur Coast, Santa Lucia Mountains, Los Padres National Forest, Mountains of San Benito County, and Interior Monterey County (including Pinnacles National Park), as well as San Francisco County.

Precautions for Residents Who Needs to Be Most Careful

The NWS has indicated that this extreme heat poses risks to many individuals, especially those sensitive to high temperatures, such as those lacking reliable air conditioning or sufficient hydration. Health services and industries sensitive to heat may also experience increased pressure as the week progresses. The advisory clearly states, "Hot conditions can cause heat illnesses."

Safety Tips During Heat Wave How to Stay Safe

To stay safe during this heat wave, it is crucial to drink fluids regularly throughout the day, not just when feeling thirsty. Whenever possible, remain indoors in air-conditioned environments during the hottest parts of the day. Avoid extended exposure to direct sunlight and check on elderly or vulnerable neighbors and family members. Never leave children or pets unattended in parked vehicles, as interior temperatures can escalate dangerously within minutes, especially during heat events. If outdoor activities are necessary, schedule them for early morning or evening when temperatures are cooler. Wear lightweight, loose-fitting clothing and be aware of the signs of heat exhaustion and heat stroke. For those working outdoors, OSHA recommends taking frequent breaks in shaded or air-conditioned areas. If someone shows symptoms of heat illness, move them to a cool, shaded location immediately and call 911 in case of an emergency.