Bulletin issued at 00:15 HKT 30/Jun/2025
HKO Readings & Radiation level Yesterday's Weather and Radiation Level: ------------------------------------------------------ Hong Kong Observatory Maximum Air Temperature 30.8 C Minimum Air Temperature 27.4 C Grass Minimum Temperature 26.6 C Relative Humidity 74 - 89 Percent Rainfall 3.7 mm Total rainfall since 1st January 426.8 mm Against an average of 1071.8 mm Other Stations Min Max King's Park 26.2 C 30.7 C Wong Chuk Hang 26.1 C 32.1 C Ta Kwu Ling 25.3 C 31.4 C Lau Fau Shan 24.5 C 30.9 C Tai Po 26.0 C 30.6 C Sha Tin 25.8 C 31.3 C Tuen Mun 25.7 C 31.1 C Tseung Kwan O 25.3 C 29.8 C Sai Kung 25.8 C 30.7 C Cheung Chau 26.2 C 30.4 C Chek Lap Kok 26.2 C 32.1 C Tsing Yi 26.4 C 32.0 C Shek Kong 25.8 C 32.3 C Tsuen Wan Ho Koon 24.9 C 29.7 C Tsuen Wan Shing Mun Valley 25.5 C 31.6 C Hong Kong Park 27.1 C 30.6 C Shau Kei Wan 24.8 C 30.3 C Kowloon City 24.9 C 31.6 C Happy Valley 27.2 C 32.3 C Wong Tai Sin 25.7 C 31.1 C Stanley 26.9 C 33.5 C Kwun Tong 24.8 C 30.1 C Sham Shui Po 26.7 C 32.6 C Kai Tak Runway Park 25.7 C 30.3 C Yuen Long Park 25.5 C 32.2 C Tai Mei Tuk 25.4 C 29.0 C Duration of sunshine (King's Park):4.1 H The mean UV index recorded at King's Park yesterday was 3the UV intensity was MODERATE The maximum UV index for yesterday was 10. Sea Surface Temperature (Waglan Island): 28.0 C Yesterday's (29 Jun 2025) average ambient gamma radiation dose rate taken outdoors in Hong Kong ranged from 0.08 to 0.15 microsievert per hour. These are within the normal range of fluctuation of the background radiation level in Hong Kong (See Note). The average dose rates measured at the radiation monitoring stations over various parts of the territory were as follows : Station Yesterday's average (microsievert/hour) Ping Chau 0.08 Tap Mun 0.08 Kat O 0.09 Yuen Ng Fan 0.11 Tai Mei Tuk 0.11 Sha Tau Kok 0.10 Kwun Tong 0.12 Sai Wan Ho 0.08 King's Park 0.14 Tsim Bei Tsui 0.13 Cape D'Aguilar 0.11 Chek Lap Kok 0.15 Note 1. From readings taken at various locations in Hong Kong in the past, the hourly mean ambient gamma radiation dose rate may vary between 0.06 and 0.3 microsievert per hour. (1 microsievert = 0.000001 sievert = 0.001 millisievert) 2. Temporal variations are generally caused by changes in meteorological conditions such as rainfall, wind and barometric pressure. 3. Spatial variations are generally caused by differences in the radioactive content of local rock and soil. 4. The data displayed is provisional. Only limited data validation has been carried out. 5. The range of relative humidity in the daily weather summary originates from the observer's reports of Hourly Readings of the day. This follows the long-term practice of collecting climatological data of the Hong Kong Observatory for over a century. It may differ from the relative humidity range derived from the 1-minute reports of the automatic weather station.