L.A. County has felt 100 degree weather already this week and is expected to feel the triple-digit record-breaking heat heading into next Tuesday.

With an expected high of 110 degrees in the valleys and mountains this weekend, the National Weather Service Forecast predicts highs of up to 115 degrees on Monday.

Cities along the coasts are not expected to see triple-digit heat until next Monday, with the temperature projected as high as 100 degrees.

We will very likely be in the midst of a full fledged and potentially dangerous heat wave by mid-week as a strong ridge will form in the region, The National Weather Service posted in a bulletin Monday. Thursday may be warm enough to threaten daily record high temperatures. Daytime highs of 105-110 F will be possible in the hottest areas. More significant offshore winds will bring the heat back on Sunday and Monday as even hotter days.

With the record heat, L.A. County residents are being advised to wear lightweight clothing, drink more water, avoid strenuous activity during the hottest parts of the day, and check on elderly or vulnerable neighbors and family members.

In line with the extreme temperatures is the reminder of fire season in L.A. County, as more than 100 acres burned near the San Gabriel Canyon of Angeles National Forest this week, with 0% containment as of this writing.

More than 200 firefighters and aircrafts have been deployed to battle the Gulch Fire, the second county brush fire in as many weeks.

The East Fire? that popped up on August 27, is now 93% contained, with 156 firefighters making progress toward putting out the blaze that at one point reached 150 acres and forced closures in several Glendora mountain roads.

The excessive heat advisory is expected to expire at 8 p.m. on Monday, Sept. 5,which falls on Labor Day.