Here are some numbers for you.
At the peak of the last glaciation, sea levels were 120 meters below what they are now, with global average temperatures 5 C less than today, giving a rather imprecise estimate of 24 meters sea level rise per degree C of warming.
But since there is only about 70 meters or so, sea level wise of ice left to melt, and will probably take 5 C to melt all of it, this gives about 10 meters of sea level rise per degree C of warming. Obviously, linear extrapolations are wrong and there is a considerable time lag between the increase in temperature and the eventual sea level rise, but given that and your estimate of 1.3 C temperature increase between now and 2100, how much do you think sea levels will rise?