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The mild weather that soothed Southern California over the weekend will be gone by Monday, when temperatures will rise again during dry conditions, raising the risk of fires and prompting a heat alert for parts of Los Angeles County.

The National Weather Service expects the heat to peak in the region on Tuesday and Wednesday. Many areas could see highs into the 90s, including those near the coast, and into the low 100s in the warmest valley communities.

Specifically, high temperatures are on tap for the West San Fernando Valley and the Los Angeles Basin beginning Tuesday through Friday and officials Monday issued a heat alert for those areas.

“High temperatures are not just an inconvenience, they can be dangerous and even deadly,” Muntu Davis, county health officer, said in a news release.

Offshore breezes in L.A. and Ventura counties could mean critical fire weather in many locations, according to NWS.

Additionally, gusts through passes and near foothills “are always a concern when it is dry,” said the Weather Service.

The high pressure that started to build over southwest California on Sunday will remain through at least Thursday, forecasters said.

County officials reminded residents to drink plenty of water, check on the vulnerable population including older adults and those who live alone and to never leave children or pets in a hot car alone.

Record-breaking heat in early September saw the explosion of two destructive blazes, the Bobcat Fire in the Angeles National Forest and the El Dorado Fire in the San Bernardino National Forest.

Cooling centers will be open to give the public some relief from the heat, locations can be found at ready.lacounty.gov.