The sky cleared up by the time the announcement was made, but several showers hit during Gatorade All-Star Workout Day, forcing both the American League and the National League to cut their batting practice sessions short.
Rain remains in the forecast throughout much of the night in Minneapolis. It's not the first time rain has affected the Home Run Derby, as the event was cancelled in 1988 at Riverfront Stadium in Cincinnati. That remains the only Derby to be cancelled due to weather.
Rhett Bollinger is a reporter for MLB.com. Read his blog, Bollinger Beat, and follow him on Twitter @RhettBollinger. This story was not subject to the approval of Major League Baseball or its clubs.