Temperatures surpassed 107 in Chatsworth and Woodland Hills and 106 in Northridge Monday because of surface high pressure building over the Great Basin that brought a period of weak offshore flow, according to the National Weather Service.
Other highs were 109 in Saugus, 106 in Pasadena, 105 in Burbank and Van Nuys, 103 in Pomona, 102 in San Gabriel and 100 in Acton, according to the National Weather Service.
A record for this date was set in Lancaster, where the high of 99 erased the previous record of 98 set in 1980.
A red flag warning denoting a high risk of wildfire will be in effect until 6 p.m. Tuesday in the Santa Clarita Valley and the San Gabriel Mountains in Los Angeles and Ventura counties. The mountain regions include the Angeles National Forest in Los Angeles County and Ventura County's Los Padres National Forest.
Conditions will not be as hot or dry Tuesday thanks to an onshore flow that will bring stronger onshore winds to the region, especially across the mountains and Santa Clarita Valley, where gusts between 25 and 30 mph can be expected, according to the National Weather Service.
The National Weather Service forecast calls for highs Tuesday of 104 in Woodland Hills, 102 in Pasadena and Saugus, 99 in Burbank and San Gabriel, 97 in Lancaster and Palmdale, 95 in Long Beach, 93 in downtown Los Angeles and 85 at Los Angeles International Airport.