Overview

• Northern California valleys will see highs dip into the upper 80s Sunday and Monday as a trough-driven onshore flow brings cooler conditions.
• After midweek, a strong Four Corners high-pressure ridge will surge westward, sending interior regions toward triple-digit temperatures by Friday.
• The National Weather Service has issued warnings for hazardous heat in the Central and Southern valleys from Aug. 8 to 10, highlighting elevated health and wildfire danger.
• Coastal and Bay Area zones remain buffered by marine-layer inversions and daily breezes, though inland hotspots could still approach 100 °F.
• Forecast models continue to diverge on how far north and how intense the ridge will be, leaving uncertainty in peak heat timing and severity.