Overview

• Seasonable holiday weather holds across the Midwest and Northeast, with Chicago near 80, Baltimore in the low 80s, Maine gradually clearing into the low 70s, and Northeast Ohio enjoying dry conditions.
• Forecasters expect showers and possible thunderstorms on Wednesday as a strong cold front crosses the Great Lakes, then highs tumble to the 60s and even upper 50s in parts of the Chicago area by Thursday.
• Southern California remains under heat advisories through Tuesday with widespread 95–105° readings, beach hazards through Monday evening for Los Angeles and Ventura counties, and a slight thunderstorm risk returning early this week.
• Northern California’s heat peaks on Labor Day after Sacramento hit 101° Saturday, with Central Valley highs near or above 100° Sunday and Monday before a midweek dip and Sierra thunderstorms Tuesday that could linger on and off through Friday.
• The Pacific Northwest outlook carries uncertainty tied to a California low, with the more likely track yielding Portland highs in the low 90s Tuesday through Thursday and the hotter near‑100° scenario viewed as less likely.