It can and will. For that matter, it's an RNA virus that is morphing as a function of the error factor of replication, so vaccines may be ineffective (for the same reason we continue to get the "common cold" again and again over our lives, as well as the flu -- the signature keeps changing).

We will see.

Though it's worth noting that there are a lot of very contrary signals on whether it attenuates with heat. Some find that it doesn't, while some do. The very origin of this -- Wuhan -- had very temperate conditions when the outbreak began, and transmission seems to be much worse in the US than in Canada.