The Honolulu Fire Department responded Tuesday morning to reports of possible stranded hikers on the Aiea Loop Trail.
The call came in shortly after 6:20 a.m. from one of the hikers carrying a cell phone.
All four hikers were able to make it out just before 5 p.m.
A father, his two teenage sons and a son's friend set out on a 5-day hike on Monday, according to fire officials.
They had a tent, some cooking equipment, food, water, but they didn't have the proper rain gear.
The four planned to hike from Aiea to Laie along the Koolau Ridge Trail. They only spent one night.
Fire crews hiked in and escorted the group down. The helicopter couldn't get down to the hikers because of the bad weather.