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2026

21/05/2026
At 6 a.m. at the Hong Kong Observatory : Air temperature : 26 degrees Celsius Relative Humidity : 97 per cent Special Landslip Advisory: Rain has been particularly heavy in North New Territories; and may cause landslides. Pay special attention to landslide risk and stay away from slopes. If landslide occurs nearby, leave immediately and call the Police under safe conditions. Please be reminded that:The Amber Rainstorm Warning Signal has been issued.The Thunderstorm Warning has been issued. It will remain effective until 8:30 a.m. today. A few squally thunderstorms are expected to occur over Hong Kong.The Special Announcement of Flooding in Northern New Territories has been issued. The air temperatures at other places were: Hong Kong Observatory26 degrees ; King's Park25 degrees ; Wong Chuk Hang26 degrees ; Ta Kwu Ling25 degrees ; Lau Fau Shan24 degrees ; Tai Po25 degrees ; Sha Tin25 degrees ; Tuen Mun25 degrees ; Tseung Kwan O25 degrees ; Sai Kung25 degrees ; Cheung Chau25 degrees ; Chek Lap Kok26 degrees ; Tsing Yi25 degrees ; Shek Kong25 degrees ; Tsuen Wan Ho Koon24 degrees ; Tsuen Wan Shing Mun Valley25 degrees ; Hong Kong Park25 degrees ; Shau Kei Wan25 degrees ; Kowloon City25 degrees ; Happy Valley26 degrees ; Wong Tai Sin25 degrees ; Stanley26 degrees ; Kwun Tong25 degrees ; Sham Shui Po25 degrees ; Kai Tak Runway Park26 degrees ; Yuen Long Park25 degrees ; Tai Mei Tuk25 degrees . Between 4:45 and 5:45 a.m., lightning was detected over all regions. The rainfall recorded in various regions were: Kwai Tsing9 to 26 mm; Sham Shui Po9 to 14 mm; Kowloon City8 to 11 mm; Wong Tai Sin8 to 11 mm; Yau Tsim Mong6 to 9 mm; Central & Western District4 to 8 mm; Wan Chai4 to 6 mm; Tsuen Wan4 to 27 mm; Eastern District3 to 12 mm; Sai Kung2 to 28 mm; Kwun Tong11 to 16 mm; Sha Tin1 to 9 mm; Southern District0 to 6 mm; Tuen Mun0 to 6 mm; Tai Po0 to 4 mm; Islands District0 to 38 mm; Yuen Long0 to 2 mm.
21/05/2026
At 3 a.m. at the Hong Kong Observatory : Air temperature : 26 degrees Celsius Relative Humidity : 93 per cent Special Landslip Advisory: Rain has been particularly heavy in North New Territories; and may cause landslides. Pay special attention to landslide risk and stay away from slopes. If landslide occurs nearby, leave immediately and call the Police under safe conditions. Intense gusts reaching 70 kilometres per hour or above may continue to affect Hong Kong. Members of public should seek safe shelter as soon as possible. Please be reminded that:The Red Rainstorm Warning Signal has been issued.The Thunderstorm Warning has been issued. It will remain effective until 4:30 a.m. today. A few squally thunderstorms are expected to occur over Hong Kong.The Special Announcement of Flooding in Northern New Territories has been issued. The air temperatures at other places were: Hong Kong Observatory26 degrees ; King's Park26 degrees ; Wong Chuk Hang28 degrees ; Ta Kwu Ling24 degrees ; Lau Fau Shan24 degrees ; Tai Po24 degrees ; Sha Tin25 degrees ; Tuen Mun25 degrees ; Tseung Kwan O27 degrees ; Sai Kung25 degrees ; Cheung Chau25 degrees ; Chek Lap Kok26 degrees ; Tsing Yi25 degrees ; Shek Kong24 degrees ; Tsuen Wan Ho Koon24 degrees ; Tsuen Wan Shing Mun Valley25 degrees ; Hong Kong Park26 degrees ; Shau Kei Wan27 degrees ; Kowloon City25 degrees ; Happy Valley28 degrees ; Wong Tai Sin25 degrees ; Stanley27 degrees ; Kwun Tong26 degrees ; Sham Shui Po25 degrees ; Kai Tak Runway Park27 degrees ; Yuen Long Park25 degrees ; Tai Mei Tuk24 degrees . Between 1:45 and 2:45 a.m., lightning was detected over all regions. The rainfall recorded in various regions were: Kwai Tsing48 to 72 mm; Sha Tin32 to 65 mm; Wong Tai Sin2 to 8 mm; Yau Tsim Mong2 to 5 mm; North District2 to 36 mm; Tsuen Wan13 to 70 mm; Tai Po13 to 63 mm; Sham Shui Po11 to 28 mm; Kowloon City1 to 6 mm; Tuen Mun0 to 7 mm; Kwun Tong0 to 4 mm; Sai Kung0 to 34 mm; Islands District0 to 22 mm; Yuen Long0 to 18 mm; Central & Western District0 to 11 mm; Southern District0 to 1 mm.
21/05/2026
At midnight at the Hong Kong Observatory : Air temperature : 29 degrees Celsius Relative Humidity : 86 per cent Localised Heavy Rain Advisory: There is severe rainstorm in North District of the New Territories. It may cause serious flooding. Members of the public should stay on high alert and take necessary precautions to reduce their exposure to risk posed by the heavy rain and flooding. Hourly rainfall is expected to exceed or has exceeded 100 millimetres in the above regions. Intense gusts reaching 70 kilometres per hour or above may affect Hong Kong. Members of public should seek safe shelter as soon as possible. Please be reminded that:The Amber Rainstorm Warning Signal has been issued.The Thunderstorm Warning has been issued. It will remain effective until 3:00 a.m. today. A few squally thunderstorms are expected to occur over Hong Kong.The Special Announcement of Flooding in Northern New Territories has been issued. The air temperatures at other places were: Hong Kong Observatory29 degrees ; King's Park28 degrees ; Wong Chuk Hang28 degrees ; Ta Kwu Ling25 degrees ; Lau Fau Shan25 degrees ; Tai Po27 degrees ; Sha Tin29 degrees ; Tuen Mun26 degrees ; Tseung Kwan O27 degrees ; Sai Kung28 degrees ; Cheung Chau27 degrees ; Chek Lap Kok29 degrees ; Tsing Yi28 degrees ; Shek Kong25 degrees ; Tsuen Wan Ho Koon27 degrees ; Tsuen Wan Shing Mun Valley29 degrees ; Hong Kong Park28 degrees ; Shau Kei Wan27 degrees ; Kowloon City28 degrees ; Happy Valley28 degrees ; Wong Tai Sin28 degrees ; Stanley27 degrees ; Kwun Tong28 degrees ; Sham Shui Po29 degrees ; Kai Tak Runway Park29 degrees ; Yuen Long Park25 degrees ; Tai Mei Tuk27 degrees . Between 10:45 and 11:45 p.m., lightning was detected within New Territories East and New Territories West. The rainfall recorded in various regions were: Tai Po0 to 9 mm; North District0 to 50 mm; Yuen Long0 to 34 mm.
20/05/2026
At 9 p.m. at the Hong Kong Observatory : Air temperature : 29 degrees Celsius Relative Humidity : 83 per cent Localised Heavy Rain Advisory: Rain is particularly heavy in North District of the New Territories. It may cause serious flooding. Residents who are likely to be affected are advised to take necessary precautions to avoid possible flood damage. Heavy rain of more than 70 millimetres of hourly rainfall has fallen or is expected to fall in the above regions. Please be reminded that:The Amber Rainstorm Warning Signal has been issued.The Thunderstorm Warning has been issued. It will remain effective until 1:00 a.m. tomorrow. A few squally thunderstorms are expected to occur over Hong Kong. The air temperatures at other places were: Hong Kong Observatory29 degrees ; King's Park28 degrees ; Wong Chuk Hang28 degrees ; Ta Kwu Ling25 degrees ; Lau Fau Shan27 degrees ; Tai Po27 degrees ; Sha Tin28 degrees ; Tuen Mun27 degrees ; Tseung Kwan O27 degrees ; Sai Kung27 degrees ; Cheung Chau27 degrees ; Chek Lap Kok30 degrees ; Tsing Yi29 degrees ; Shek Kong26 degrees ; Tsuen Wan Ho Koon27 degrees ; Tsuen Wan Shing Mun Valley29 degrees ; Hong Kong Park28 degrees ; Shau Kei Wan27 degrees ; Kowloon City28 degrees ; Happy Valley29 degrees ; Wong Tai Sin28 degrees ; Stanley27 degrees ; Kwun Tong27 degrees ; Sham Shui Po29 degrees ; Kai Tak Runway Park28 degrees ; Yuen Long Park27 degrees ; Tai Mei Tuk26 degrees . Between 7:45 and 8:45 p.m., lightning was detected within New Territories East. The rainfall recorded in various regions were: North District2 to 49 mm; Tsuen Wan0 to 8 mm; Yuen Long0 to 37 mm; Tai Po0 to 16 mm; Sai Kung0 to 1 mm; Sha Tin0 to 1 mm.
20/05/2026
At 6 p.m. at the Hong Kong Observatory : Air temperature : 29 degrees Celsius Relative Humidity : 81 per cent During the past hour the mean UV Index recorded at King's Park : 0.3 Intensity of UV radiation : low The air temperatures at other places were: Hong Kong Observatory29 degrees ; King's Park28 degrees ; Wong Chuk Hang28 degrees ; Ta Kwu Ling29 degrees ; Lau Fau Shan27 degrees ; Tai Po28 degrees ; Sha Tin29 degrees ; Tuen Mun27 degrees ; Tseung Kwan O27 degrees ; Sai Kung27 degrees ; Cheung Chau26 degrees ; Chek Lap Kok29 degrees ; Tsing Yi29 degrees ; Shek Kong29 degrees ; Tsuen Wan Ho Koon27 degrees ; Tsuen Wan Shing Mun Valley29 degrees ; Hong Kong Park28 degrees ; Shau Kei Wan27 degrees ; Kowloon City28 degrees ; Happy Valley28 degrees ; Wong Tai Sin28 degrees ; Stanley27 degrees ; Kwun Tong28 degrees ; Sham Shui Po28 degrees ; Kai Tak Runway Park28 degrees ; Yuen Long Park28 degrees ; Tai Mei Tuk27 degrees .
20/05/2026
At 3 p.m. at the Hong Kong Observatory : Air temperature : 30 degrees Celsius Relative Humidity : 76 per cent During the past hour the mean UV Index recorded at King's Park : 6 Intensity of UV radiation : high The air temperatures at other places were: Hong Kong Observatory30 degrees ; King's Park30 degrees ; Wong Chuk Hang29 degrees ; Ta Kwu Ling30 degrees ; Lau Fau Shan29 degrees ; Tai Po30 degrees ; Sha Tin30 degrees ; Tuen Mun28 degrees ; Tseung Kwan O28 degrees ; Sai Kung28 degrees ; Cheung Chau28 degrees ; Chek Lap Kok29 degrees ; Tsing Yi29 degrees ; Shek Kong30 degrees ; Tsuen Wan Ho Koon27 degrees ; Tsuen Wan Shing Mun Valley30 degrees ; Hong Kong Park29 degrees ; Shau Kei Wan28 degrees ; Kowloon City29 degrees ; Happy Valley30 degrees ; Wong Tai Sin30 degrees ; Stanley30 degrees ; Kwun Tong29 degrees ; Sham Shui Po29 degrees ; Kai Tak Runway Park28 degrees ; Yuen Long Park30 degrees ; Tai Mei Tuk28 degrees .
20/05/2026
At noon at the Hong Kong Observatory : Air temperature : 29 degrees Celsius Relative Humidity : 76 per cent During the past hour the mean UV Index recorded at King's Park : 8 Intensity of UV radiation : very high The air temperatures at other places were: Hong Kong Observatory29 degrees ; King's Park30 degrees ; Wong Chuk Hang29 degrees ; Ta Kwu Ling29 degrees ; Lau Fau Shan28 degrees ; Tai Po28 degrees ; Sha Tin29 degrees ; Tuen Mun28 degrees ; Tseung Kwan O30 degrees ; Sai Kung29 degrees ; Cheung Chau29 degrees ; Chek Lap Kok30 degrees ; Tsing Yi29 degrees ; Shek Kong28 degrees ; Tsuen Wan Ho Koon26 degrees ; Tsuen Wan Shing Mun Valley29 degrees ; Hong Kong Park28 degrees ; Shau Kei Wan29 degrees ; Kowloon City30 degrees ; Happy Valley30 degrees ; Wong Tai Sin30 degrees ; Stanley31 degrees ; Kwun Tong30 degrees ; Sham Shui Po29 degrees ; Kai Tak Runway Park30 degrees ; Yuen Long Park29 degrees ; Tai Mei Tuk27 degrees . Between 10:45 and 11:45 a.m., the rainfall recorded in various regions were: Yuen Long0 to 2 mm. From midnight to noon, 3.2 millimetres of rainfall were recorded at the Hong Kong Observatory.
20/05/2026
At 9 a.m. at the Hong Kong Observatory : Air temperature : 27 degrees Celsius Relative Humidity : 88 per cent During the past hour the mean UV Index recorded at King's Park : 1 Intensity of UV radiation : low Please be reminded that:The Thunderstorm Warning has been issued. It will remain effective until 10:30 a.m. today. Isolated squally thunderstorms are expected to occur over Hong Kong. The air temperatures at other places were: Hong Kong Observatory27 degrees ; King's Park26 degrees ; Wong Chuk Hang26 degrees ; Ta Kwu Ling26 degrees ; Lau Fau Shan25 degrees ; Tai Po26 degrees ; Sha Tin27 degrees ; Tuen Mun25 degrees ; Tseung Kwan O25 degrees ; Sai Kung26 degrees ; Cheung Chau25 degrees ; Chek Lap Kok27 degrees ; Tsing Yi26 degrees ; Shek Kong26 degrees ; Tsuen Wan Ho Koon25 degrees ; Tsuen Wan Shing Mun Valley26 degrees ; Hong Kong Park26 degrees ; Shau Kei Wan26 degrees ; Kowloon City26 degrees ; Happy Valley27 degrees ; Wong Tai Sin26 degrees ; Stanley25 degrees ; Kwun Tong26 degrees ; Sham Shui Po27 degrees ; Kai Tak Runway Park27 degrees ; Yuen Long Park26 degrees ; Tai Mei Tuk25 degrees . Between 7:45 and 8:45 a.m., the rainfall recorded in various regions were: Tuen Mun3 to 7 mm; Yuen Long0 to 8 mm; Islands District0 to 7 mm; Kwai Tsing0 to 5 mm; Tai Po0 to 3 mm; Tsuen Wan0 to 2 mm; North District0 to 10 mm. From midnight to 9 a.m., the minimum temperature was 25.9 degrees Celsius at the Hong Kong Observatory.
20/05/2026
At 6 a.m. at the Hong Kong Observatory : Air temperature : 27 degrees Celsius Relative Humidity : 87 per cent Intense gusts reaching 70 kilometres per hour or above may affect Hong Kong. Members of public should seek safe shelter as soon as possible. Please be reminded that:The Thunderstorm Warning has been issued. It will remain effective until 7:30 a.m. today. A few squally thunderstorms are expected to occur over Hong Kong. The air temperatures at other places were: Hong Kong Observatory27 degrees ; King's Park27 degrees ; Wong Chuk Hang27 degrees ; Ta Kwu Ling27 degrees ; Lau Fau Shan26 degrees ; Tai Po27 degrees ; Sha Tin27 degrees ; Tuen Mun27 degrees ; Tseung Kwan O26 degrees ; Sai Kung26 degrees ; Cheung Chau25 degrees ; Chek Lap Kok28 degrees ; Tsing Yi27 degrees ; Shek Kong27 degrees ; Tsuen Wan Ho Koon25 degrees ; Tsuen Wan Shing Mun Valley26 degrees ; Hong Kong Park27 degrees ; Shau Kei Wan26 degrees ; Kowloon City26 degrees ; Happy Valley28 degrees ; Wong Tai Sin26 degrees ; Stanley26 degrees ; Kwun Tong26 degrees ; Sham Shui Po27 degrees ; Kai Tak Runway Park27 degrees ; Yuen Long Park27 degrees ; Tai Mei Tuk25 degrees . Between 4:45 and 5:45 a.m., the rainfall recorded in various regions were: North District0 to 1 mm.
20/05/2026
At 3 a.m. at the Hong Kong Observatory : Air temperature : 26 degrees Celsius Relative Humidity : 90 per cent The air temperatures at other places were: Hong Kong Observatory26 degrees ; King's Park26 degrees ; Wong Chuk Hang26 degrees ; Ta Kwu Ling26 degrees ; Lau Fau Shan25 degrees ; Tai Po25 degrees ; Sha Tin27 degrees ; Tuen Mun26 degrees ; Tseung Kwan O25 degrees ; Sai Kung26 degrees ; Cheung Chau25 degrees ; Chek Lap Kok27 degrees ; Tsing Yi26 degrees ; Shek Kong27 degrees ; Tsuen Wan Ho Koon25 degrees ; Tsuen Wan Shing Mun Valley25 degrees ; Hong Kong Park27 degrees ; Shau Kei Wan25 degrees ; Kowloon City25 degrees ; Happy Valley27 degrees ; Wong Tai Sin26 degrees ; Stanley25 degrees ; Kwun Tong25 degrees ; Sham Shui Po27 degrees ; Kai Tak Runway Park26 degrees ; Yuen Long Park26 degrees ; Tai Mei Tuk25 degrees . Between 1:45 and 2:45 a.m., the rainfall recorded in various regions were: Sai Kung0 to 1 mm.

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