Charlie Weaver of Keswick, Va., returned Weather Permitting to the winner's circle last night, guiding the 10-year-old gray gelding to victory in the Regular Confirmation Hunter Stake at the Washington International Horse Show at Capital Centre.

The horse, owned by Kenneth and Sally Wheeler's Cismount Farm and Mrs. Wheeler's uncle, August A. Busch, was named regular confirmation champion after outlasting an original field of 18 entries. Weather Permitting won the title and the Shenandoah Challenge Trophy with 21 points.

Center Stage, an 8-year-old brown gelding shown by Jeffrey Wells of Raleigh, N.C., was second in the stakes competition.

Henry the Hawk, an aged bay gelding, was named reserve champion with 17 points acquired during the week's competition. The horse went into the class one point up on Weather Permitting but knocked down a rail, a rarity for him.

"He's sick. He's been sick all morning," said rider-trainer Don Stewart Jr.

Showing Grand Lieu and riding for the U.S. Equestrian Team, Norman Dello Joio, 26, earned his second consecutive victory in the Gambler's Choice Stakes, an International-open jumper class, scoring 1,120 points.

Canadians made their best showing to date, winning second and third places. Master William, ridden by Ian Millar, accumulated 1,080 points, followed by Kahlua with Danny Foster aboard, also with 1,080 points but in a slower time.

The United States leads team competition with 71 points. Switzerland is second with 22, Canada third with 16 and France fourth with 14.

Earlier, Patty Heuckeroth guided Edward Bulkley's Sly Step to the championship in the Green Conformation Hunter Championship.

Heuckeroth, of Southern Pines, N.C., won 19 1/2 points on the 5-year-old chestnut gelding.

Jamie Mann won the Regular Working Hunter Championship on Hoodwink, an 8-year-old gray gelding owned by Mr. and Mrs. Carl H. Lindner Jr. Mann, 26, of South Smithfield, R.I., had 10 points toward the championship.

In the intermediate jumper events, Katharine Burdsall, who, along with Melanie Smith, one of the leading show jumpers, rides for the Windrush Farm of Litchfield, Conn., won on Melton Mowbray.

Burdsall had seven points on the championship chart after riding the 7-year-old brown gelding. Michael Matz of Plymouth Meeting, Pa., took reserve to Burdsall on Alvin's Ace. The 6-year-old gray gelding had four points.