Alaskan Front to Push Heat From Southland by Weekend : Weather: Temperatures should begin descending today, reaching lower-than-normal levels by Saturday.

The heat wave won’t break today, but at least it will bend a little.

And by the weekend, temperatures should finally be back to normal, perhaps even a little cooler.

Rick Dittmann, a meteorologist with WeatherData Inc., said a trough of low-pressure air from the Gulf of Alaska should move over California during the next couple of days, shoving out the immense dome of high pressure that has kept the Southland roasting for almost two weeks.

The high temperature in Orange County should be “only” in the low 90s today, down from a high of 96 in Anaheim on Wednesday. By Friday, the high should be in the mid-80s, and by Saturday the top reading should be about 80, roughly 4 degrees below normal for this time of year.

The cooling trend will also be felt in the San Gabriel and San Fernando valleys, where readings as high as 108 were recorded earlier this week. The thermometers there shouldn’t get much above 100 today, followed by top readings in the upper 90s on Friday and mid- to low 90s Saturday.

Temperatures will be cooler in the mountains, too, with highs of 70 to 85 over the weekend.

Things should stay about the same early next week, with temperatures remaining at normal, or slightly below.

“The marine air will start moving inland again,” Dittmann said. “That means a little fog and low clouds along the coast. It should be pretty nice.”

And Southern Californians may start reaching for a blanket or two at night, the forecaster said. Overnight lows should dip into the mid-60s by Friday and the low 60s by the weekend.

Wednesday’s highs included 93 in El Toro, 90 in Santa Ana and 87 in San Juan Capistrano. Newport Beach escaped the searing heat, with a high of 72.

Times staff writer Greg Hernandez contributed to this story.