"Blame It On The Rain" debuted on the U.S. Billboard Hot 100 on October 7, 1989, at number sixty-five. Seven weeks later, for the week ending November 25, 1989, it reached number one, and occupied the spot for two weeks. It also spent a total of twenty-three weeks on the Hot 100. The song became Milli Vanilli's third number one single on the Hot 100 after "Baby Don't Forget My Number" and "Girl I'm Gonna Miss You". "Rain" was their final single to top the chart before their infamous scandal took off.

It was preceded at number one on the Hot 100 by Bad English's "When I See You Smile" (also penned by Warren) and succeeded by Billy Joel's "We Didn't Start the Fire".

The song was ranked at number 21 on Billboard's Year-End Singles list for 1989, and number forty-six for 1990.

...
Wikipedia