It is the photographer's responsibility to protect and care for his equipment.
If you are the careful sort, you will take extra precautions in transporting your equipment to areas where there are sand and high heat.
If photographers in the desert can shoot and the temperature is hotter than Singapore. I don't think Singapore is any sandier or hotter than that.
If you are worried about the heat, I would suggest that you do not expose your camera to the sun for long periods.
Keep it in your camera bag, when you want to shoot, take it out shoot and then replace it inside the bag when not using.
If you wear your DSLR on a strap around your neck and walk around the entire day, of course the heat over the extended period is not so good for the DSLR or the lens.
Keeping a cleaning kit and blower brush with you may be a good idea and careful handling plus cleaning will keep dust and dirt away from the sensitive parts of the camera.