The boiling point of 5-MeO-DMT is higher than that of DMT. It's melting point is 67-70 C, close to the boiling point of DMT. It's boiling point seems to be unknown. It's likely to have a boiling point of twice it's melting point, probably something like 130 C (266 F) or higher.
Note that freebase DMT doesn't vaporize easily in boiling water because it forms a gas that is somewhat soluble in boiling water, so it tends to stay in solution but does slowly boil away. Much like hydrogen chloride tends to stay in a solution of water even though it's boiling point is -85.1 C (-121.18 F), but if the cap is left opened, hydrogen chloride gas tends to slowly vaporize away from the hydrochloric acid (hydrogen chloride dissolved in water). If you open a container of hydrochloric acid, you can see some of the hydrogen chloride gas vaporizing away. DO NOT BREATHE IN ANY OF THE GAS OR GET IT IN YOUR EYES!