If you are interested in knowing the data accurately, on this website planetcalc there is an apparent temperature calculator. To do this, enter the temperature (Celsius degrees), the wind (meters per second) and the relative humidity of the day that interests you.
Why it happens
Water vapour can be found in the air, although the amount it can contain is limited and varies according to its temperature. The hotter, the more water it can absorb.
In Bangkok there are usually high temperatures, so the air can hold a large amount of water. In fact, that is what happens, due to its tropical climate and being next to the sea it is loaded with a lot of humidity.
When can it be a problem?
The proportion of water that the air contains, with respect to the maximum that it can admit, is measured in percentages. This means that as it approaches the maximum, to 100%, it can already admit very little and consequently it hardly evaporates from our skin. The result is that sweating is no longer effective and the wind chill increases. We lose water and minerals uselessly.
Fortunately, the wind attenuates this effect.
If it coincides that, for example, in your visit to Bangkok the temperature is high (32℃ or 89.6℉), there is little wind (1 m/s or 2.24 mph) and the relative humidity is also high (80%). Then the wind chill will be 40.2℃ or 104.4℉. The same can happen in other destinations.