Record-breaking heat has suffocated Southern California since last Thursday and will finally ease Tuesday.

From Friday to Sunday, downtown Los Angeles hit 100 degrees on back-to-back-back days. The sweltering 100-degree stretch was the longest in 25 years and matched the longest ever recorded in October.

Los Angeles’ last streak at least this hot occurred in April 1989 when there were four straight days at or above 100. Its longest 100-degree stretch on record occurred in 1955 when the mercury topped the century mark for 8 straight days August 31 to September 7.

The heat stressed electricity generation and at least 9,000 and 6,000 customers were without power Friday and Saturday, respectively, the LA Times reported.

On Sunday record highs were not only established in downtown Los Angeles, but also in several other cities including Long Beach which hit 99 and San Diego which soared to 94, shattering its previous record by 5 degrees.

San Diego also tied or set daily record highs on Friday and Saturday. Friday’s high of 99 tied the record from 1994 and Saturday’s high of 96 bested the old mark of 92 from 1991.

San Diego’s warm overnight lows in the mid-70s Saturday through Monday were astonishing, ranking as the top three warmest lows in all of October dating back to 1875.

In Camarillo, Cali. on Friday, the mercury skyrocketed to 108 degrees becoming the hottest temperature ever recorded there in any month dating back to 1958, surging past the old record by 5 degrees.

The heat wave is a result of unusually strong high pressure at high altitudes which has remained more or less stationary in the region since late this week. However, an area of low pressure offshore will push it eastward,

The core of the heat will shift towards Las Vegas and Phoenix Tuesday and Wednesday, where record highs may be threatened according to