Southern California Weather Forecast: Record Heat, Santa Ana Winds, and Hurricane Melissa Update - October 28, 2025

Southern California Heatwave

• 🌡️ Record heat was recorded in Downtown Los Angeles, reaching 97 degrees, with Yorba Linda hitting 100 degrees.
• 💨 Santa Ana winds are contributing to warmer temperatures, especially closer to the coast, due to a process called downsloping.
• 🥵 Overnight recoveries are expected to be rough due to these winds, with less effective cooldowns than usual.

Hurricane Melissa Update

• 🌀 Hurricane Melissa has intensified to a Category 4 storm.
• 🌊 It regained strength over the warm Atlantic waters after encountering friction and losing energy over land.
• ➡️ Melissa is currently moving in a northeasterly direction at approximately 9 miles per hour.

Red Flag Warning and Fire Conditions

• 🔥 A Red Flag Warning is in effect due to critically low relative humidity levels, with values as low as 11% in Downtown Los Angeles.
• ⚠️ While winds are a factor, they are not the primary driver of the Red Flag Warning; the extreme dryness is the main concern.
• ⚠️ The Heat Advisory is set to expire tomorrow at 7:00 PM.

Upcoming Temperature Outlook

• ☀️ Tomorrow is expected to remain warm, with some areas like Van Nuys being 11 degrees warmer than yesterday.
• ⛰️ Mountain temperatures will be in the low 70s tomorrow, dropping to the upper 60s on Thursday and mid-60s on Friday.
• 🏜️ The low desert will see mid-90s through Saturday, with a slight cooldown on Monday.
• 🏡 Inland Empire temperatures will be in the low 90s on Wednesday and Thursday, dropping to 88 on Saturday and Sunday.