An excessive heat warning is in place for parts of San Diego County, according to the National Weather Service (NWS).
In the mountains, the excessive heat warning will remain in effect until at least 8 p.m. Monday.
The NWS says maximum temperatures in the mountains and through the deserts for Saturday and Sunday are expected to be between 100 and 105 degrees.
In Borrego Springs, the heat is expected to break the all-time high record of 122 degrees, according to NBC 7's Dagmar Midcap.
The NWS is warning people to avoid being outside, as exceedingly high temperatures can cause heat-related illnesses or even death. Children, the elderly, and those with health conditions are most vulnerable.
It's important to also stay hydrated throughout the heat wave.
Here are some tips from the NWS to beat the heat:
The county has also designated local Cool Zones, which are now open so people can chill out during the hottest parts of the day. Local libraries, recreation centers and senior centers across the county are some examples of Cool Zones.
Although the hot weather will stick around for the next few days, by the middle of next week, temperatures are expected to cool down, according to the NWS.
For more weather updates, click here to take a look at the local forecast.