Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 19/Mar/2026

HKO Readings & Radiation level

Yesterday's Weather and Radiation Level:
------------------------------------------------------

Hong Kong Observatory
Maximum Air Temperature                     27.8 C
Minimum Air Temperature                     20.8 C
Grass Minimum Temperature                   18.0 C
Relative Humidity                        58 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January           194.4 mm
Against an average of                       99.5 mm

Other Stations                Min                  Max
King's Park                  19.7 C               26.4 C
Wong Chuk Hang               18.9 C               27.1 C
Ta Kwu Ling                  18.8 C               28.5 C
Lau Fau Shan                 17.4 C               27.9 C
Tai Po                       19.7 C               27.1 C
Sha Tin                      19.9 C               28.3 C
Tuen Mun                     18.3 C               27.6 C
Tseung Kwan O                19.1 C               27.5 C
Sai Kung                     20.2 C               26.2 C
Cheung Chau                  18.7 C               27.0 C
Chek Lap Kok                 20.5 C               28.1 C
Tsing Yi                     18.8 C               26.8 C
Shek Kong                    16.6 C               28.8 C
Tsuen Wan Ho Koon            17.1 C               27.3 C
Tsuen Wan Shing Mun Valley   17.7 C               28.3 C
Hong Kong Park               19.9 C               26.4 C
Shau Kei Wan                 19.9 C               26.2 C
Kowloon City                 19.0 C               28.9 C
Happy Valley                 20.0 C               28.3 C
Wong Tai Sin                 19.0 C               28.8 C
Kwun Tong                    19.4 C               28.3 C
Sham Shui Po                 19.6 C               27.4 C
Kai Tak Runway Park          20.6 C               25.6 C
Yuen Long Park               16.9 C               30.1 C
Tai Mei Tuk                  19.5 C               27.9 C

Duration of sunshine (King's Park):8.9 H    
The mean UV index recorded at King's Park yesterday was 3the UV intensity was MODERATE 
The maximum UV index for yesterday was 7.

Yesterday's (18 Mar 2026) 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                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.08
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
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.