Robert MacIntyre caught fire on the back nine after a first-round rain delay at the BMW Championship to open up a four-stroke lead over Scottie Scheffler.

The temperatures in Owings Mills, Maryland, during the four tournament rounds are expected to be high 80s, perhaps reaching 90 by Sunday, according to Accuweather. There is an 80 percent chance of a thunderstorm during Thursday's first round. Expect it to be hot and humid all week, especially on the weekend.