Clouds and isolated showers start the week in Philadelphia before temperatures climb into the 90s and storm chances grow.

Boston gets a sunny Monday before showers and thunderstorms move in for much of the week. The holiday weekend should bring cooler, drier weather.

Indianapolis will heat up to 97 degrees by Wednesday, with heat index values near 102 Tuesday. Storm chances return late Thursday and Friday.

Jacksonville gets a steamy start Monday before afternoon storms bring heavy rain, lightning and possible flooding. More thunderstorms are lined up all week.

Cincinnati’s heat ramps up from 94 Monday to 97 Thursday before storms finally return Friday. The weekend brings a modest cooldown.

Morning showers open the week in Pittsburgh before temperatures surge into the 90s. Storm chances rise late Wednesday and Thursday.

A rainy Monday morning will quickly give way to a hot Columbus week. Highs reach the mid-90s before late-week storms bring some relief.

Cleveland's heat ramps up through Wednesday, with temperatures reaching 91°F before thunderstorms become more likely. A cooler, sunnier weekend follows.

Miami gets a steamy Monday with a 106-degree heat index before afternoon thunderstorms roll in. The storm pattern continues through the weekend.

Detroit’s early-September forecast brings low-90s heat, humid air and several chances for thunderstorms before a cooler weekend arrives.

Orlando gets a brief quiet start Monday before storms, lightning and heavy rain move in after noon. The unsettled pattern is expected to linger through Sunday.

Cloudy skies keep Monday mostly quiet in NYC, but storms return after 8 p.m. The unsettled pattern lingers through Thursday before a cooler weekend reset.

Baltimore starts the week near 89 degrees before heat surges into the mid- and upper 90s. Storm chances build through Thursday, then cooler weekend weather arrives.