Record-hot summer has already peakedPeople use jackets and hoods as protection from strong sunlight in Bang Na district, Bangkok in early April. The department is expected to announce the end of summer and the beginning of the rainy season in the middle of next month, he added. Coupled with a high air temperature, the heat index there is usually higher than other areas, he said. In other words, the heat index is what the temperature feels like to the human body when relative humidity is combined with the air temperature. If the air temperature is higher than 40°C, the heat index can be 45°C or higher, a level which can cause people to faint or be hit by heat stroke, he added.
