Summer may be coming to an end, but a mid-summer-like blast of heat will persist Wednesday before a cooling trend begins.

A heat advisory issued by the National Weather Service will be in effect until 8 p.m. Wednesday in the San Fernando, San Gabriel and Santa Clarita valleys, along with the Santa Monica Mountains Recreational Area, with temperatures of up to 105 degrees expected.

Inland areas of Orange County, including Santa Ana, Anaheim, Garden Grove and Fullerton, will be under a heat advisory from 10 a.m. to 8 p.m. Wednesday.

Things could start cooling Wednesday along the coast as the region sees a slow shift from offshore flow to onshore.

“Offshore flow beneath high pressure aloft will bring another warm day to the region today (Wednesday),” according to the NWS. “Some cooling will develop across the region and become more pronounced for late week as a low-pressure area drops into the region. A trough will linger into next week for continued cooler temperatures.”

The hot weather on Tuesday toppled some local records. Long Beach reached a high of 98 degrees, breaking the record of 97 set on the same date in 1989. Sandberg tied the 2011 record of 90 degrees. In Orange County, Anaheim reached 104 degrees on Tuesday, breaking the record of 102 set in 2015.

Conditions should change beginning Thursday, with a return of onshore flow and the arrival of a low-pressure system that will likely cool temperatures into Sunday. Forecasters said many areas could see temperatures drop by 5 to 10 degrees on Thursday, “bringing temps back to near normal.”

As usual, forecasters warned residents to take precautions if they are outside in the heat, such as drinking plenty of liquids, avoiding prolonged exposure to the sun and checking on vulnerable relatives and neighbors.

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