Weather Report > Yesterday's Weather and Radiation Level
Bulletin updated at 00:15 HKT 21/ May /2019

Yesterday's Weather and Radiation Level

Hong Kong Observatory:
Maximum Air Temperature: 32.0°C
Minimum Air Temperature: 25.0°C
Grass Minimum Temperature: 25.6°C
Relative Humidity: 76 - 92%
Rainfall: 9.0 mm

Total rainfall since 1st January: 541.7 mm
Against an average of 519.5 mm

Other Stations Min Max
King's Park 24.3°C 31.8°C
Ta Kwu Ling 24.0°C 32.6°C
Wong Chuk Hang 24.6°C 30.2°C
Lau Fau Shan 24.3°C 32.5°C
Tai Po 23.1°C 32.1°C
Sha Tin 23.8°C 33.0°C
Tuen Mun 24.9°C 32.7°C
Tseung Kwan O 23.7°C 32.4°C
Sai Kung 23.7°C 33.2°C
Cheung Chau 24.8°C 32.3°C
Chek Lap Kok 25.9°C 34.7°C
Tsing Yi 24.3°C 31.9°C
Shek Kong 24.4°C 32.7°C
Tsuen Wan Ho Koon 23.8°C 30.7°C
Tsuen Wan Shing Mun Valley 24.3°C 31.4°C
Hong Kong Park 23.9°C 31.1°C
Shau Kei Wan 24.6°C 32.4°C
Kowloon City 24.2°C 32.8°C
Happy Valley 24.9°C 33.0°C
Wong Tai Sin 24.5°C 33.0°C
Stanley 24.8°C 30.3°C
Kwun Tong 24.4°C 31.2°C
Sham Shui Po 24.1°C 31.9°C
Kai Tak Runway Park 24.5°C 32.5°C
Yuen Long Park 24.9°C 33.3°C
Duration of Sunshine (King's Park): 2.7 H

The mean UV Index recorded at King's Park yesterday was 3, the UV intensity was moderate.

The maximum UV Index for yesterday was 8.

Yesterday's (20 May) average ambient gamma radiation dose rate taken outdoors in Hong Kong ranged from 0.09 to 0.14 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
King's Park 0.14
Ping Chau 0.09
Tap Mun 0.09
Kat O 0.11
Yuen Ng Fan 0.12
Tai Mei Tuk 0.11
Sha Tau Kok 0.10
Kwun Tong 0.13
Sai Wan Ho 0.09
Tsim Bei Tsui 0.13
Cape D'Aguilar0.13
Chek Lap Kok0.14


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.
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