Midweek temperature tumble

The peak of this week's heatwave is currently hitting its final hours tonight, with a Heat Advisory remaining active until 9:00 PM for the interior Bay Area. A major pattern change arrives at midnight, bringing a rapid cooldown, muggy overnight humidity and a return of thick coastal fog. Air Quality Alert for the East Bay until Midnight. Could be extended tomorrow. We will keep a watchful eye! Today was officially the hottest day of the week, with inland areas soaring into the 90s and local hotspots cracking 100°F. Tomorrow brings instant relief as strong onshore marine winds rush back into the region. Interior valleys will experience a significant drop, topping out in the comfortable mid-70s to 90 degrees. The Coast: Highly comfortable, crisp conditions will prevail with daytime highs staying in the mid-60s to mid-70s. Tonight's Muggy Fog & Drizzle Timeline (Pattern Change at Midnight) The Setup: A compressed marine layer is quickly rebuilding over the ocean, locking in high, muggy humidity tonight.