Sweltering temperatures in Hong Kong are taking a toll on hikers, with a number of people admitted to hospitals on Sunday suffering from heat stroke. The good news is that there will be reprieve for the city later in the week, when showers are expected.

Temperatures soared as high as 34.5 degree Celsius on Sunday, and relative humidity reached 70%, according to the Observatory, as an anticyclone in the South China Sea pushed a warm front over the region. Sheung Shui and Tai Po in the New Territories reached 36 degrees, which was the highest temperature recorded so far this year.

A 47-year-old man surnamed Yeung suffered heat stroke while hiking with a friend at Sai Kung, in the New Territories. The couple started off from Pak Tam Chung and Yeung complained that he felt unwell when they arrived in Sai Wan at 2pm. He had a rest but was then found to be unconscious.

His friend called the police immediately and Yeung was airlifted to Pamela Youde Nethersole Eastern Hospital in a critical condition. The man was still in an intensive care unit on Monday.

Another two men and a woman also suffered heat stroke. One man is in a stable condition but the other two are still serious.

The Observatory has hoisted the Very Hot Weather Warning signal for the past week and it remained in place on Monday. Showers are not expected until Wednesday, but they will continue into the weekend.