After reaching its initial peak as a low-end Category 4 hurricane, microwave and Hurricane Hunter data indicated that Juliette underwent an eyewall replacement cycle. Subsequently, Juliette weakened into a Category 3 hurricane on September 24 and then into a high-end Category 2 system with 110 mph (160 km/h) winds; however, by September 25, Juliette had completed the cycle and quickly regained major hurricane status. The hurricane developed very cold cloud top temperatures. along with a classic structure of an intense hurricane and a very well-defined eye. A large hurricane, Juliette reached its peak intensity of 145 mph (230 km/h) and on the same day. Around that time, Reconnaissance Aircraft reported a minimum central pressure of 923 mbar.