Tropical Storm Bill was a tropical cyclone that produced widespread rainfall across East Texas, Oklahoma, the Midwest, and Mid-Atlantic. The second named storm of the season, Bill developed from a broad area of low pressure over the northwestern Gulf of Mexico on June 16. Because the system was already producing tropical storm force winds, it was immediately classified as Tropical Storm Bill. Initially continuing northwestward, Bill re-curved west-northwestward later on June 16. Around 12:00 UTC, the storm peaked with maximum sustained winds of 60 mph (95 km/h). Just under five hours later, Bill made landfall near on Matagorda Island, Texas, at the same intensity. The cyclone weakened to a tropical depression and turned northward early on June 17. Bill remained a tropical cyclone until late on June 18, when it degenerated into a remnant low. The remnant low moved east-northeastward until dissipating over West Virginia on June 21.

The 2015 Atlantic hurricane season was the last of three consecutive below average Atlantic hurricane seasons. It produced twelve tropical cyclones, eleven named storms, four hurricanes, and two major hurricanes. The Accumulated Cyclone Energy (ACE) for the season was 68% of the long-term median value. The hurricane season officially began on June 1, 2015, and ended on November 30, 2015. These dates historically describe the period each year when most tropical cyclones form in the North Atlantic basin. However, the first named storm, Ana, developed on May 8, nearly a month before the official start of the season, the first pre-season cyclone since Beryl in 2012 and the earliest since Ana in 2003. The formation of Ana marked the start of a series of seven consecutive seasons with pre-season activity, spanning from 2015 to 2021. The season concluded with Kate transitioning into an extratropical cyclone on November 11, almost three weeks before the official end.