The weather system that would later become Chantal began to affect Bermuda on July 30. It caused some thunderstorms. The next day, it caused heavy rainfall that reached r2.12 inches (53.8 mm) at the Bermuda International Airport. Winds on the island reached 45 mph (72 km/h) because of the weather system. After Chantal passed Bermuda, a ship with the call sign of "C60Y4" recorded winds of 37 mph (59 km/h).