Cooler temperatures and patchy drizzle across Southern California will give way to sunny skies and rising temperatures this week, forecasters said.
A prolonged heat wave will take hold starting Monday, pushing highs into the triple digits in some inland areas by the middle of the week.
A high-pressure ridge built over the region Sunday, triggering a steady warming trend.
“Next week is going to be a hot one and lasting at least two days longer than the previous heat wave,” the NWS stated.
After highs reached the 70s on Sunday, a shallow marine layer could bring dense fog to coastal Los Angeles County Monday morning, but it’s expected to clear quickly, forecasters said.
Temperatures across most areas are forecast to climb another 5 to 10 degrees by Monday afternoon. The western San Fernando Valley could near 90 degrees, up to 15 degrees warmer than Sunday.
Starting Tuesday, highs are expected to mirror the September-October heat waves, reaching the low 100s in the warmest valleys, the low 90s in downtown Los Angeles and the 80s in most other areas away from the coast, according to forecasters.
The conditions could warrant another round of heat advisories for the coastal valleys and possibly even parts of the interior coastal plain, according to the NWS.
Onshore flow is expected to return Thursday, bringing a gradual cooling trend heading into next weekend.