Many viruses, including coronaviruses, become less durable in warmer, drier conditions, and for this and other reasons, become somewhat less infectious in the summertime. For ordinary diseases like the cold and influenza, this is enough to cause a reduction in the total number of cases during the summer—but these diseases to not magically go away. The reason we face different flu strains each year is not because last year's strain is gone, it's because flu continually evolves, and newer strains gradually displace the old ones as we develop immunity.
Again, colds and flu do not "go away" in the summer, they just become less of a problem.
We don't know if SARS-COV-2 will "become less of the problem" in warm weather. So far it doesn't look like it, as it seems to be growing throughout the world regardless of local season or climate (the southern hemisphere is entering winter as the northern enters summer, and equatorial regions are warmer, and sometimes drier, then temperate regions).
But even assuming that SARS-COV-2 does become less transmissible like many other viruses, that won't be the end of the pandemic. This virus is so infectious to begin with that as with social distancing, the most we can hope for from warmer weather is a further slow to its spread.
And that's a good thing, because this pandemic will only end one of two ways. Either we will develop and deploy an effective vaccine (in a year or so if we're lucky) or the virus will run out of new people to infect. If the later happens too quickly—because everyone who could be infected already has been—the result will be millions of dead and millions more debilitated or (in places like the US, buried under crippling medical debt.)
Neither God nor nature is going to swoop in like the last act in War of the Worlds and save us. Only our science can do that. source