After six months or so you acclimatize and the heat feels less oppressive. Partly because you accept that you can't do anything about it and partly because feeling hot is the new normal. After a year you just can't be bothered feeling like the heat is stifling because you still can't do anything about it and it does no good obsessing over it.
It's hot, no doubt but its not a predominant or intolerable obsession for me any longer.
Drink 3 or 4 liters of water every day, stay out of the direct sun, wear a wide brimmed hat to keep the sun off your face and neck, wear light coloured loose fitting clothing that breathes easily like silk.
At least choose fabrics that wick moisture away from the skin and lets it evaporate away. Cotton is not your friend here. If I am feeling uncomfortable, I jump in the pool and don't towel myself dry - I let the evaporation process suck away some heat from my skin. Especially effective on the head when your hair is wet.
If I have to be outside in the sun I'll wet a bandanna and tie it loosely around my neck to cool the blood as it flows to and from my head. I'll often wear a bandanna on my head to soak up the sweat and keep it out of my eyes. As the sweat evaporates from the bandanna it cools my forehead a bit.
Simply, you get used to the heat and get on with things, perhaps at half speed. When it gets really hot in Aug/Sept/Oct I'll take a nap or watch some TV mid afternoon with the AC on in the bedroom to give my body a break and a chance to cool down - it really sucks to leave the bedroom afterward though. While at home, there is usually a fan on nearby.