An excessive heat warning and a heat advisory are in effect for the San Diego desert regions and San Diego County Valleys, the National Weather Service said.
The excessive heat warning impacts Borrego Springs, located about 90 miles northeast of downtown San Diego, and Banning, among other Southern California communities.
The warning will remain in effect through 8 p.m. Monday with temperatures expected to reach 120 degrees. The hottest temperatures are expected between Sunday and Monday, NWS said.
“We are in the midst of a heatwave, which will be even hotter Sunday and Monday as those temperatures peak,” said NBC 7 Weathercaster Brooke Landau.
The NWS in San Diego said the heat advisory impacts Ramona, an unincorporated community in San Diego County located about 36 miles northeast of downtown San Diego, and Valley Center.
In July, 22 days were recorded at 89 degrees or above, according to NBC 7 meteorologist Sheena Parveen. Of those 22 days, 17 were above 90 degrees and 2 of were 100 degrees and above.
Parveen said the reason for the heat has been the placement of high pressure to the east.
The advisory will also remain in effect until 8 p.m. Monday with temperatures expected to reach up to 116 degrees in the deserts. Inland areas and the mountains may also see temperatures in the low-90s while coastal areas see temperatures in the low-80s.
An excessive heat warning or heat advisory is issued when there is a risk for heat illness. The NWS advises people to drink plenty of fluids, stay in an air-conditioned room and out of the sun, and to check on the elderly and those without air conditioning.
"We stay very warm the rest of the week with no decent cool-down in sight," Parveen said.
Here is a look at designated cool zones around the county.