Weather Report > Yesterday's Weather and Radiation Level
Bulletin updated at 00:15 HKT 20/ Sep /2017

Yesterday's Weather and Radiation Level

Hong Kong Observatory:
Maximum Air Temperature: 32.2°C
Minimum Air Temperature: 27.6°C
Grass Minimum Temperature: 26.2°C
Relative Humidity: 64 - 81%
Rainfall: 0 mm

Total rainfall since 1st January: 2348.7 mm
Against an average of 2140.7 mm

Other Stations Min Max
King's Park 27.0°C 31.7°C
Ta Kwu Ling 24.2°C 31.9°C
Wong Chuk Hang 25.8°C 31.5°C
Lau Fau Shan 25.4°C 31.0°C
Tai Po 26.3°C 31.1°C
Sha Tin 26.7°C 31.5°C
Tuen Mun 26.0°C 31.9°C
Tseung Kwan O 26.5°C 31.5°C
Sai Kung 27.1°C 30.4°C
Cheung Chau 26.3°C 32.6°C
Chek Lap Kok 27.8°C 33.7°C
Tsing Yi 27.0°C 33.4°C
Shek Kong 24.7°C 33.1°C
Tsuen Wan Ho Koon 24.8°C 29.6°C
Tsuen Wan Shing Mun Valley 25.4°C 31.0°C
Hong Kong Park 26.5°C 30.8°C
Shau Kei Wan 27.2°C 29.9°C
Kowloon City 27.0°C 32.3°C
Happy Valley 26.9°C 33.2°C
Wong Tai Sin 25.3°C 31.6°C
Stanley 27.4°C 31.1°C
Kwun Tong 26.9°C 31.0°C
Sham Shui Po 27.4°C 32.4°C
Kai Tak Runway Park 28.1°C 30.7°C
Yuen Long Park 25.6°C 33.6°C
Duration of Sunshine (King's Park): 9.3 H

The mean UV Index recorded at King's Park yesterday was 4, the UV intensity was moderate.

The maximum UV Index for yesterday was 9.

Sea surface temperature (Waglan Island): 29.6°C

Yesterday's (19 Sep) average ambient gamma radiation dose rate taken outdoors in Hong Kong ranged from 0.08 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 0.08
Tap Mun 0.09
Kat O 0.08
Yuen Ng Fan 0.12
Tai Mei Tuk 0.12
Sha Tau Kok 0.10
Kwun Tong 0.11
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 during the period 1987-2016, the background ambient gamma radiation levels may vary between 0.06 and 0.30 microsievert per hour.
2. The extent of health effects to a person as a result of exposure to radiation is expressed by a physical quantity called equivalent dose, in unit of sievert. Protective action may be required if there is an increase in the ambient gamma dose rate above background such that the total additional dose is expected to exceed 5000 microsieverts in a relatively short period of time. For example, a dose of 5000 microsieverts may be reached when the ambient gamma dose rate is 1000 microsieverts per hour (several thousand times above background) and lasts for 5 hours.
3. The readings of ambient gamma radiation level from instrument are expressed in unit of gray, which is numerically equal to the gamma dose expressed in sievert.
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