The National Weather Service issued a heat advisory for San Luis Obispo County on Tuesday — with some areas potentially reaching triple digits.
The advisory is in effect through 8 p.m. Wednesday evening, and temperatures up to 103 degrees are expected.
The advisory comes as a heat wave sweeps through the western United States. Heat advisories have also been issued in the Bay Area and parts of Washington.
SLO County mountains and interior valleys will be most impacted, as well as Cuyama Valley.
The service advises the public to stay as hydrated and cool as possible. Seek out air-conditioning, stay out of the sun and wear lightweight or loose-fitting closing, the advisory said.
Young children and pets should not be left in vehicles under any circumstances, it said.
According to California Department of Industrial Relations, heat illness can occur rapidly, especially if working outside in extreme heat. Signs of heat illness include heat rash or cramps, fainting, heavy sweating, nausea and fatigue.
Call 911 if you suspect you or a loved one may be experiencing heat illness, the advisory says.