Kilo was about 520 miles south of Honolulu with sustained winds of 30 mph (48 kph) yesterday, reported Hawaii News.
The hurricane centre says Kilo could regain strength, becoming a tropical storm by today night and a hurricane by Thursday. It is supposed to take a northward turn, and the timing of the turn will determine how much of a threat it is to Kauai and Oahu, according to forecasters.
"There is considerable uncertainty as to where this system will make its turn toward the north, so people in Hawaii should continue to pay attention to the forecast and be ready for any changes over the next few days," Robert Ballard of the National Weather Service and the hurricane centre told Hawaii News Now.
"Every tropical cyclone is different. Just because we have been lucky so far this season with Guillermo and Hilda does not mean we will be so lucky for the rest of the season," said Ballard.
Tom Evans, acting director of the hurricane center, said the storm is expected to pass over warm water to the south of the islands and avoid wind shears in the northern area of the state that weakened previous storm systems.