The pilot reported that he diverted to the accident airport due to weather with low ceilings. He encountered a gust of wind and rain during the turn from the base leg to final approach, which caused the airplane to be right of the runway centerline. Although the airplane floated down the runway and landed long, the pilot elected not to do a go-around. The pilot reported that the wet runway caused the tires to hydroplane, which increased the stopping distance. The airplane was traveling about 5 to 10 mph when it overran the end of the runway. The pilot attempted to veer the airplane to the left, but the right wing hit a fence, and the nose gear collapsed. A postaccident examination of the airplane revealed substantial damage to a longeron in the empennage. The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.