Even with the heat advisory and excessive heat warning lifted, Sunday is expected to be warm and humid. Temperatures will be in the 70s at the coast and in the 80s inland. In Borrego Springs temperatures will be in the triple digits once again.
When humidity interacts with heat it increases the threat from thunderstorms, NBC 7's Llarisa Abreu said.
Strengthening high pressure above the desert brought hot weather inland Friday and lingered through Saturday.
Hot, humid weather like this means heat-related illnesses are likely if preventative measures are not taken. This means doing all outdoor activities bright and early, before the real heat sets in.
Officials issued red flag warnings for fire danger in Santa Barbara County's mountains and south coast due to dry, hot winds starting Thursday evening.
The Cleveland National Forest has announced it will close Three Sisters and Cedar Creek Falls for public and rescuer safety.
Spiking temperatures will be accompanied by more moisture moving up from Mexico that could add humidity to the heat wave in some areas.
To avoid heat-related illness, drink plenty of fluids, stay in an air-conditioned room or stay out of the sun; check on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances.
Cooling zones have been set up across the county.
NBC 7's weather anchor Llarisa Abreu said the county will experience an increase in moisture on Sunday. This could lead to a good chance of thunderstorms at higher elevation areas.