Shops in the city are running out of dehumidifiers as demand has risen from people trying to get rid of the mould since the early onset of high humidity levels.
Last month was unusually humid, with the relative humidity level at 88 per cent, the highest since 1959 and 10 per cent above normal for this period of the year.
The sky was also gloomier than usual: there was sunshine for just 31.8 hours, only a third of the usual figure.
And the air is getting wetter, with relative humidity hitting 94 per cent on Monday. It will be equally wet during the week, he said.
Kammy Tsang, who promotes a brand of dehumidifiers at a Tsuen Wan department store, said the shop she works at had been out of stock since Friday. The store offers around seven models that cost between HK$1,000 and HK$4,000.
'There are usually five or six dehumidifiers of each model in stock. We order more from suppliers when we run out,' she said. 'But now, even the suppliers are out of stock.' Supplies were adequate this time last year because it was not as humid.
She said she had been constantly cleaning the mould off the walls in her home trying to prevent permanent black stains.