If the temperature drops or rises by a few degrees, people notice it quickly. Personally, I don’t really notice it. I just think it's always hot outside! Some of my students and friends here will wear jackets, especially in the evening–even when it's still around 78 degrees out.
Also, because we are closer to the equator, the sun is very strong. A lot of people go outside covering up much of their skin or using umbrellas to block the sun. Even though people can be seen wearing pants or long sleeves, it helps keep them cooler than if they wore a shirt and a t-shirt. That is because their clothes help protect their skin from absorbing the sun’s rays and helps keep them cooler.
To me, everything feels hot and sweaty outside all the time. My body is still adjusting to the heat and humidity here. Luckily, almost everyone in Thailand carries around portable, hand-held electric fans. I was given one two weeks ago and have carried it with me everywhere since. It is the greatest thing!
