Southern California Heads Into Its Hottest Week of 2026, With Triple Digits and Wildfire Risk

Southern California is about to get cooked. The National Weather Service says the region is heading into what forecasters are calling the hottest week of 2026 so far, with an extreme heat watch in effect from Tuesday morning through Friday evening.

Ryan Kittell, a meteorologist with the NWS office in Oxnard, summed up the forecast bluntly, according to the Los Angeles Times: "The only real question for the [Wednesday] through [Friday] forecast is: will it be very hot or extremely hot?"

Downtown Los Angeles hit 96 degrees on Sunday, August 23, and the NWS forecast calls for highs of 96 to 98 through Friday before dipping slightly to 94 on Saturday, per the Los Angeles Times. CBS News reports that widespread temperatures this week will run 6 to 12 degrees above average, with inland communities in the Inland Empire expected to reach 107 to 112 degrees by midweek. Tuesday should bring triple digits to the Inland Empire, with inland Orange County flirting with the 100-degree mark.

The desert will be worse. Patch reports Palm Springs is expected to hit 109 degrees Monday through Thursday, with Palm Desert reaching 110 on Tuesday and Borrego Springs also forecast to hit 110. Death Valley's Furnace Creek, one of the hottest places on Earth, recorded a high of 121 degrees, with the NWS projecting highs of 119-120 through Friday and overnight lows stuck in the mid-90s, according to the Los Angeles Times.

That heat has already turned deadly. A 68-year-old traveler from France died on August 17 in Death Valley National Park after his car broke down in a remote area during a 116-degree day, the Los Angeles Times reported.

Why It's So Hot

Kittell told the Los Angeles Times the immediate cause is high pressure aloft, producing what meteorologists call "compressional warming." He added that an extra factor is a shift toward more northerly winds, which will push temperatures even higher. Patch and pasadenanow both note the added twist: some monsoonal moisture at the mid-to-upper levels will make the heat feel even more oppressive, even though it isn't expected to bring meaningful rain.

Forecasters don't expect major Santa Ana wind events this week. Patch reports winds will mostly stay in the range of 15 to 25 mph, with gusty north-to-northwest winds likely each night in the interior mountains, especially around the Grapevine.

Fire Risk Still Elevated

No Santa Anas doesn't mean no fire danger. Kittell told the Los Angeles Times, "we do have a history of large fires when it gets this hot." Both Patch and pasadenanow report the National Weather Service is warning of an increased risk for "large plume-dominated fire behavior" across the region this week, driven by the combination of extreme heat and dropping humidity rather than wind.

The Alert System, Explained

For residents trying to figure out how worried to be, the NWS uses a tiered system. A heat advisory, in place for downtown Los Angeles through 10 a.m. Tuesday, means some groups face elevated risk. An extreme heat watch, running from 10 a.m. Tuesday through 8 p.m. Friday, signals conditions are approaching something more dangerous. If it escalates to an extreme heat warning, that means dangerous heat is either happening or imminent, putting everyone at risk, not just vulnerable groups.

Orange County has its own advisory running through at least Monday evening for inland areas, according to pasadenanow, with the possibility of an extension if the forecast holds. Anaheim is expected to climb from 94 degrees Sunday to 97, 99, and eventually 100 degrees by Tuesday through Thursday.

What Officials Are Telling People to Do

The advice from health officials, repeated across every regional report, is basic but urgent: drink plenty of fluids, stay in air-conditioned spaces when possible, avoid direct sun during peak hours, and check on elderly relatives and neighbors who may not have working air conditioning. Officials are also reiterating a warning that gets repeated every summer for a reason: never leave children or pets in parked vehicles, even briefly, since interior temperatures can reach lethal levels in minutes.

San Diego will see comparatively milder conditions along the coast, with highs in the low 80s, according to Patch, while inland San Diego County climbs into the low 90s and desert areas near Borrego Springs hit triple digits.

The heat is expected to persist through the weekend of August 29-30, according to pasadenanow, meaning there's no fast relief on the horizon. For a state already dealing with a hot, dry summer and active wildfires elsewhere in the West, including one burning nearly 11,000 acres outside Reno, Nevada, as of Saturday, the next several days will test both infrastructure and preparedness across Southern California.