Temperatures will hit their highest point in the heat wave beginning Tuesday. Photo credit: @NWSSanDiego, via Twitter

A late-spring heat wave will provide the San Diego area with a sultry preview of summer over the next week, meteorologists advised Friday.

A high-pressure system building over the Southwest raised San Diego County temperatures Friday afternoon up to 6 degrees higher than 24 hours earlier.

The system will send local temperatures soaring into next week, peaking Tuesday through Thursday, according to the National Weather Service.

The highest temperatures in the deserts will be up to 120 degrees over the period, and overnight lows in those areas will only drop to the mid- to upper-80s, forecasters said.

The valleys and mountains will not be quite as hot, with highs in the 90s likely.

Low-end daytime humidity of around 10%, combined with gusty winds, will result in elevated wildfire hazards for the deserts and eastern slopes of the mountains each afternoon through the heat wave, the weather service advised.

Coastal areas will mostly escape the swelter due to shallow marine layer and onshore flow, the weather service predicted.

Computer models indicate that the region will begin to experience some reprieve from the heat sometime toward the end of the workweek or the following weekend, according to the NWS.

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