On the one hand, you might think that the boiling point of THC is 315°F, but other sources indicate a different value. Pubchem, an online database of chemical compounds, indicates that the boiling point of THC is 392°F at 0.02 mm Hg (at low pressure). Pubchem cites the National Toxicology Program (NTP) as a source. Going deeper, we see that page 13 of the NTP report on THC indicates that the boiling point is 200 °C or 392 °F.
However, this number has a drawback: it appears as the boiling point of THC at 0.02 mm Hg, which means that 392 °F is the boiling point of THC under pressure almost in vacuum. This has real effects not only on the taste and smell of the cannabis product, but also on its effects. Terpenes, especially in combination with each other, can increase the effects of phytocannabinoids, a phenomenon called the entourage effect. For example, a common terpene profile believed to promote relaxing and calming experiences includes myrcene, beta-caryophyllene, and linalool; these terpenes are often associated with a calming effect.
However, if these terpenes are degraded or boiled before consumption, the results of laboratory tests that identify and quantify terpenes will no longer be useful. While people may argue about the ideal boiling point of THC, 315 degrees Fahrenheit is a widespread goal and a range of 200 to 400 degrees Fahrenheit is an even safer bet. If you vape at 356 Fahrenheit (180 degrees Celsius) AT ATMOSPHERIC PRESSURE (where you live, right?) , THC is not “boiling”, but is released at a rate much higher than the ambient temperature of 72 °F. When it comes to numerical values, such as the boiling point of a compound, Wikipedia usually comes close enough because it's easy to agree on something so simple and all the primary sources provide approximately the same value.
The general rule is that, within a certain range, the higher the boiling point, the more intense the THC effect will be. Therefore, if there is THC in the cannabis that you are going to vaporize, it is likely that something will remain in the vapor even after it exceeds its boiling point.