According to the pilot of a float-equipped Maule M-7-235, there was a rain squall in the "immediate area" of his planned water landing. The pilot decided to land 1/2 mile to the northeast, into a northeast wind. Upon touchdown, a wind gust lifted the right wing with more force than the pilot could counteract. The airplane's left float submerged, then separated, along with the strut, from the wing. The airplane spun to the left, and the right wingtip struck the water. The pilot reported about 350 hours of flight time, with 100 hours in model, and 75 to 100 water landings within the previous year.