The approaching Tropical Storm Goni cooled the city's air markedly yesterday afternoon after temperatures had hovered above 34 degrees Celsius for two days. The Observatory issued the No1 signal at 3.45pm, warning people against the fifth storm to affect the city this year. Temperatures dropped about 7 degrees from 34.9 after downpours across the city in the evening. Sweating pedestrians breathed a sigh of relief, although business for drinks and ice-cream sellers dropped off. About midday yesterday, the Observatory in Tsim Sha Tsui recorded a temperature of 34.9 degrees. That beat the temperature two days ago - 34.6 degrees - and became the highest recorded this year. Queues formed outside many shops that sold drinks. A staffer at Taiwan Food, a shop in Mong Kok, said business boomed on Sunday. 'People asked for large-size drinks,' she said, adding that smoothies were the No1 choice. The shop had done 10 per cent more business over the weekend than the previous weekend, she said. But rain was very bad for business. Taxi driver Philip Chan said he was making an extra HK$100 a day during the hot weather. 'Some office employees in suits named destinations they could reach by crossing a few streets,' he said. Despite dark clouds gathering over several hours, many people were caught when showers swept the city in the late afternoon. At about 10pm, Tropical Storm Goni was about 310 kilometres south-southeast of Hong Kong and forecast to move north towards the Guangdong coast at about 12km/h. The Observatory's forecast for today is for mainly cloudy weather with occasional squally showers and thunderstorms. Temperatures will be 27 to 30 degrees.