PORTSMOUTH — The Coast Guard and local rescue personnel were searching last night for a 65-year-old man who fell overboard from his sailboat late yesterday afternoon.

The man was boating with his wife aboard the 32-foot Elizabeth when he was struck on the head by the vessel’s boom and went overboard. The man was not wearing a flotation device. The man’s wife called the Coast Guard around 4:50 p.m.

Late last night the crew of a 25-foot Coast Guard boat out of Castle Hill in Newport found a hat in the waters of the search area centered about one-tenth of a mile west of Tiverton. The wife of the missing man confirmed it belonged to her husband, said Coast Guard Petty Officer Connie Terrell.

Searchers were planning to search through the night for the missing man. An 87-foot Coast Guard cutter was joining the search. The Coast Guard said conditions in the search area included one-foot seas, 76-degree water and winds blowing at 10-knots.