Tropical Storm Bonnie was a tropical storm that made landfall on Florida in August 2004. The second storm of the 2004 Atlantic hurricane season, Bonnie developed from a tropical wave on August 3 to the east of the Lesser Antilles. After moving through the islands, its fast forward motion caused it to dissipate. However, Bonnie later regenerated into a tropical storm near the Yucatán Peninsula. Bonnie attained its peak intensity with maximum 1-minute sustained winds of 65 miles per hour (105 km/h) and a minimum central pressure of 1,001 mbar on August 11 while located over the Gulf of Mexico. Afterwards, the storm turned to the northeast and hit Florida with winds of 45 miles per hour (72 km/h). The storm accelerated to the northeast and became an extratropical cyclone to the east of New Jersey. Bonnie was the first of five tropical systems in the 2004 season to make landfall in Florida, coming ashore the day before Hurricane Charley struck. Bonnie was also the second of a record eight storms to reach tropical storm strength during the month of August.

The 2004 Atlantic hurricane season was a very deadly, destructive, and active Atlantic hurricane season, with over 3,200 deaths and more than $61 billion in damage. More than half of the 16 tropical cyclones brushed or struck the United States. Due to the development of a Modoki El Niño – a rare type of El Niño in which unfavorable conditions are produced over the eastern Pacific instead of the Atlantic basin due to warmer sea surface temperatures farther west along the equatorial Pacific – activity was above average. The season officially began on June 1 and ended on November 30, though the season's last storm, Otto, dissipated on December 3, extending the season beyond its traditional boundaries. The first storm, Alex, developed offshore of the Southeastern United States on July 31, one of the latest dates on record to see the formation of the first system in an Atlantic hurricane season. It brushed the Carolinas and the Mid-Atlantic, causing one death and $7.5 million (2004 USD) in damage. Several storms caused only minor damage, including tropical storms Bonnie, Earl, Hermine, and Matthew. In addition, hurricanes Danielle, Karl, and Lisa, Tropical Depression Ten, Subtropical Storm Nicole and Tropical Storm Otto had no effect on land while tropical cyclones. The season was the first to exceed 200 units in accumulated cyclone energy (ACE) since 1995, mostly from Hurricane Ivan, the storm produced the highest ACE. Ivan generated the second-highest ACE in the Atlantic, only behind 1899 San Ciriaco Hurricane.