It feels like summertime in March across much of the western United States this week, as an extraordinary, early heat wave sends temperatures skyrocketing in California and the Southwest.

SAN FRANCISCO (AP) — San Franciscans bared an unusual amount of skin for this time of year Tuesday, as a city better known for its chilly summers, drizzle and fog is seeing its hottest March in at lea...

The National Weather Service said temperatures could continue rising through the week, potentially reaching 98 degrees Thursday and possibly 99 degrees in downtown Los Angeles.