Soviet scientists confidently predict that during the 22nd Olympiad here, July 19 until Aug. 3, 1980, "The average daily temperature will be 18 degrees Celsuis, relative humidity will be 70 percent and wind velocity will be three to five meters per second."

The Soviets, it seems, may have thought of everything in playing host to the 1980 Summer Olympics. That is what they would like the rest of the world to believe and surely they give every sign of believing it themselves.

Never mind that the forecast doesn't mention the city's fickle summer weather, chill winds or baking heat, or the remarkably early sunrises and late sunsets of this northern city that frequently drive tourists from more southerly latitudes to sleepless distraction.

Those are details not to be worried about. Rest assured, the Soviet probably have though of everything, and if it can't be fixed up, worked on or hidden, then it will be ignored.

In Soviet eyes, the choice of Moscow for the Games represents both an enormous achievement and a great opportunity. These will be the first Olympics ever in a Communist country and, to the government, that means the dropping of one more international barrier to full acceptance on the world stage of the Soviet Union as a nation to be admired and respected.

Little effort is being spared to insure that the country looks its best for the estimated 300,000 foreign tourists 13,000 athletes, 10,000 or more reporters and photographers, not to mention perhaps as many as a billion people who will view some part of the two-week-long international sports contest on television.

So this city on seven hills on the banks of the winding Moscow River is feversihly at work to finish all in time for the Games. After a harsh winter of unusual cold that caused delays in construction, the crews of Comsomol - Young Communist League - shockworkers, 23,000 strong, are busy riveting, welding, sawing, hammering and finishing the Olypmic Village as wellas refurbishing Moscow's main sports "palaces" and adding several handsomely designed new ones.

The Soviets are predicting complete success in having all finished in time for the opening ceremony at Luzhniki Stadium in a picturesque bend of the river on July 19, 1980. And veteran foreign observes, members of the International Olympic Committee and the top brass of the U.S. Olympic Committee are saying the same.

Although beset by labor shortages, bad weather and instances of shoddy workmanship, the Soviets are uniquely equipped by their authorities state to accomplish such massive work. This is a country of no strikes, no visible inflation and no public debate over the need for an Olypmics, or even the siting of major facilities that means a permanent change in a neighborhood.

The Soviet government, the Soviet defense ministry, the vast National Trade Union Council, the state-run sports dynasty, the Communist Pary and the capital's own powerful government are all striving toward victory in presenting the Summer Games.

Such a meshing of state, party and government interests is without direct parellel in the West. It seems perfectly reasonable to predict that the 1980 Games here will yield the kind of results by Soviets so desperately want - rousing success.

With so many carefully nurtured careers on the line, it is not surprising that Soviet Olympic organizers sometimes respond abrasively to outside suggestions.

"The organizing committee's psychology is very defensive still," said one Western diplomat who has dealt closely with the Soviet on the Games.

"They somehow link small technical details to a wider attempt to discredit them in the West."

The Soviets maintain they will spend no more than 230 million rubles - about $350 million - for new comstruction and renovation here at the Olympics center and at the secondary sites of Tallinn, Minsk and Leningrad. Westeners, with an eye on the massive costs to Mexico City, Munich and Montreal, doubt this could be the real figure.

But if the Soviet assertion is any where near accurate, the currency short nation should make a bundle on the Games from the tourists, athletes and media armies being readied to descend on the capital. That is, if politics doesn't intervene in a way that could both limit participation and cast a cloud over the future of the Games. The Soviets, who have done as much as any nation, or perhaps more, to politicize international sports, are acutely aware of the complicating factors of politics that have entered the Games in recent years. They don't want the kind of boycott here that marred the 1976 summer games in Montreal, when some two dozen black nations pulled out in protest.

But those are questions beyond the realm of Moscow's planners and builders, for whom the Olympics have been both a glorious opportunity to improve the city's services and a trial of speeding deadlines, uncertain labor and fights over piorities.

Uppermost in their minds has been the comfort and convenience of the athletes. And here, Without doubt, the Soviets have succeeded. The men and women who will compete here will be looked after and pampered as perhaps nowhere else in the world. This is a sports-crazy nation that dotes upon its "sportsmeni," as the athletes will discover when they arrive next summer. CAPTION: Picture, Models of Prospekt Mira complex in Moscow show arena (left) where swimming and diving competition will take place and indoor basketball and boxing facility seating 45,000.