Kennedy High’s Richmond campus is off-limits to staff and families after preliminary vapor testing results prompted a district warning. The notice arrives just before teachers return and the new school year begins.

Philadelphia gets a mostly sunny 87°F Tuesday before showers and thunderstorms arrive Wednesday. A hotter, more humid stretch follows into the weekend.

San Jose will see sunny skies and low-90s heat Tuesday, with temperatures climbing to 94 degrees by Friday and Saturday. Dry conditions are also raising fire weather concerns.

Clear skies and an 83-degree afternoon are on tap Tuesday before thunderstorms return Wednesday and dangerous heat builds into the weekend.

Downtown Los Angeles will shake off patchy morning fog Tuesday before reaching 87°F under mostly sunny skies. A warm, dry stretch continues through the weekend.

Phoenix is headed for 109-degree heat Tuesday and 111-degree highs by Friday and Saturday. Blowing dust and a few storm chances are also in the forecast.

Morning haze will give way to sunny skies in San Francisco Tuesday, with a high near 75 and breezy afternoon conditions. A mostly sunny week follows, though temperatures cool by Monday.

D.C. will start Tuesday with sunshine and an 87-degree high before storms arrive overnight with a localized flooding concern.

San Diego’s coast starts cloudy Tuesday before warming into a sunny weekend. Inland mountains and deserts face dangerous heat through Saturday.

A Broomfield golf course reservoir is nearly gone, offering a stark look at the region’s drought. City officials are asking major reuse-water customers to cut consumption.

Seattle will heat up to 83 degrees Tuesday and 88 Wednesday as wildfire smoke spreads through the afternoons. Cooler, sunnier weather arrives this weekend.

Portland is heading into a hot, smoky stretch, with highs near 99 degrees before cooler weather arrives this weekend.

Chicago warms to 84 degrees Tuesday before thunderstorms and heavy rain take over Wednesday and Thursday.