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Hong Kong Regional Weather Information Portal

Hong Kong Regional Weather Information Portal


  • Temperature Temperature
  • Relative Humidity Relative Humidity
  • Max Temperature Max Temperature
  • Min Temperature Min Temperature
  • Past 24-hour Temperature Difference Past 24-hour Temperature Difference
  • Weather Photo Weather Photo
  • Hong Kong Heat Index Hong Kong Heat Index
  • Grass Temperature Grass Temperature
  • Wind Wind
  • Maximum Gust Maximum Gust
  • Visibility Visibility
  • Mean Sea Level Pressure Mean Sea Level Pressure
  • Rainfall Rainfall
  • Yesterday's Max Temperature Yesterday's Max Temperature
  • Yesterday's Min Temperature Yesterday's Min Temperature

Legend

Temperature
(updated at )
Unit: degree Celsius (°C)
temperature color palette
Relative Humidity
(updated at )
Unit: percent (%)
Relative Humidity color palette
Maximum Temperature
(recorded: )
Unit: degree Celsius (°C)
Maximum Temperature color palette
Minimum Temperature
(recorded: )
Unit: degree Celsius (°C)
Minimum Temperature color palette
Yesterday's Maximum Temperature
(recorded: )
Unit: degree Celsius (°C)
Maximum Temperature color palette
Yesterday's Minimum Temperature
(recorded: )
Unit: degree Celsius (°C)
Minimum Temperature color palette
Past 24-hour Temperature Difference
(updated at )
Unit: degree Celsius (°C)
Past 24-hour Temperature Difference color palette
Grass Temperature
(updated at )
Unit: degree Celsius (°C)
Grass Temperature color palette
Visibility
(updated at )
Unit: metres or kilometres (m or km)
Visibility color palette
Maximum Gust
(updated at )
Unit: kilometres per hour (km/h)
Maximum Gust color palette
Mean Sea Level Pressure
(updated at )
Unit: hectopascal (hPa)
Wind
(updated at )
Wind Speed
Unit: kilometres per hour (km/h) - numbers in wind compasses
Wind color palette
Wind
(updated at )
Wind Speed
Unit: kilometres per hour (km/h)
Wind color palette
Relative Humidity
(updated at )
Unit: percent (%)
Relative Humidity color palette
Visibility
(updated at )
Unit: metres or kilometres (m or km)
Visibility color palette
Mean Sea Level Pressure
(updated at )
Unit: hectopascal (hPa)
Temperature
(updated at )
Unit: degree Celsius (°C)
temperature color palette
Maximum Gust
(updated at )
Unit: kilometres per hour (km/h)
Maximum Gust color palette
Ambient Gamma Radiation Level in HK
(updated at )
Unit: microsievert per hour (µSv/h)
dose rate record RMN color palette
* Radiation level is affected by natural
   variations of weather and generally
   varies between 0.06 and 0.3 µSv/h.
Rainfall Past-hourly Accumulated
Unit: mm
rainfall color palette
Weather Radar (Range: )
(updated at )
Rainfall Rate - RadarRainfall Record
Unit: millimetres per hour (mm h-1)
Weather Radar color palette ( : updated at )
Lightning Location
(Forecast : )
Lightning Location Cloud-To-Ground Lightning  Lightning Location
Lightning Location Cloud-To-Cloud Lightning
(Detection : )
lightning count

Notes

General

  • 「 Station higher than 500 metres above mean sea level 」: Station higher than 500 metres above mean sea level
  • 「 * 」: Derived from incomplete data set
  • 「 Under Maintenance / Data Temporarily Not Available 」: Under Maintenance / Data Temporarily Not Available
  • 「 Number for wind speed in kilometres per hour; arrow for wind direction」: Number for wind speed in kilometres per hour; arrow for wind direction
  • More Legends and Icons

Guide

  • 「 Switch to Past Data」: Switch to Past Data
  • 「 Switch to Present Data」: Switch to Present Data
  • 「 Toggle on/off Radar Layer」: Toggle on/off Radar Layer
  • 「 Toggle on/off Lightning Layer」: Toggle on/off Lightning Layer
  • 「 Toggle on/off Weather (Forecast Only) Layer」: Toggle on/off Weather (Forecast Only) Layer

Remark

  • The observational data is provisional. Only limited data validation has been carried out.
  • The numerical Hong Kong Heat Index reading above represents the average of readings in the 10 minutes ending at the indicated time
  • The Hong Kong Heat Index was calculated from the measured Natural Wet Bulb Temperature (Tnw), Globe Temperature (Tg) and Dry Bulb Temperature (Ta). Its value is given by 0.80Tnw + 0.05Tg + 0.15Ta. Reference : K.L. Lee, Y.H. Chan , T.C. Lee, William B. Goggins & Emily Y.Y. Chan, The development of the Hong Kong Heat Index for enhancing the heat stress information service of the Hong Kong Observatory, International Journal of Biometeorology, DOI 10.1007/s00484-015-1094-7, November 2015.
  • Generally speaking, the public should take appropriate precautions when the index at King’s Park reaches around 30 or above to prevent from adverse health effects brought by hot weather.
  • This webpage displays the grass temperature for the period 5 p.m. to 8 a.m. the following day. It is updated every 10 minutes.
  • The grass temperature for the period 8 a.m. to 5 p.m. is not displayed. The measurement may not truly reflect the grass temperature due to direct exposure of the sensor to the sun.
  • The measurement may not truly reflect the grass temperature in the presence of frost.
  • The Observatory has set up backup weather stations and anemometers in some areas. When the main weather stations or anemometers in those areas are under maintenance, the webpage will display data from the backup stations or anemometers.
  • The Chek Lap Kok wind station is located near the middle of the North Runway of the Hong Kong International Airport. When this station is under maintenance, wind data of Chek Lap Kok may be temporarily provided by another wind station within the Hong Kong International Airport.
  • The Observatory has set up backup weather stations and anemometers in some areas. When the main weather stations or anemometers in those areas are under maintenance, the webpage will display data from the backup stations or anemometers.
  • The Chek Lap Kok wind station is located near the middle of the North Runway of the Hong Kong International Airport. When this station is under maintenance, wind data of Chek Lap Kok may be temporarily provided by another wind station within the Hong Kong International Airport.
  • The numerical visibility reading above represents the average of readings in the 10 minutes ending at the indicated time.
  • The visibility at Chek Lap Kok is provided by the visibility meter near the middle of the south runway of the Hong Kong International Airport. When this visibility meter cannot provide data, the visibility value will come from one of the neighbouring meters at the airport.
  • The reported visibility ranges between 100 metres and 50 kilometres. A visibility report of 100 metres refers to visibilities of 100 metres or less. A visibility report of 50 kilometres refer to visibilities of 50 kilometres or more.
  • Please note that the photographs are captured by webcams automatically and are compressed onsite before transmitted to the Hong Kong Observatory Headquarters. Due to limited image resolution and possible effect of environmental factors other than weather on image quality, these photographs should be used for reference only.
  • The forecast information adopts the data directly generated from The Automatic Regional Weather Forecast (ARWF) computer system without manual adjustments. The individual weather element forecast given in a station includes at most the forecast information of weather, temperature, relative humidity as well as wind direction and speed, subject to the available observations of that station. The forecast may be different from the official weather forecasts issued by the Observatory or the measurements recorded at individual weather stations. Please refer to the official forecasts issued by the Observatory.
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