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Hong Kong Observatory Hong Kong Space Museum The University of Hong Kong Ho Koon Nature Education cum Astronomical Centre
Weather Information for Astronomical Observation
OnOff Local Weather Forecast Local Weather Forecast Updated at 13:45 HKT
The northeast monsoon is affecting the coast of Guangdong. Locally, temperatures over many places around noon were six to seven degrees lower than those of yesterday.

At noon, Tropical Depression Kirogi was centred about 320 kilometres east of Ho Chi Minh City. It is forecast to move west at about 18 kilometres per hour in the general direction of the southern part of Vietnam.

Weather forecast for this afternoon and tonight

Cloudy with one or two rain patches. Moderate to fresh northeasterly winds, occasionally strong offshore and on high ground at first.

Outlook : Cool in the morning and at night in the next few days.

OnOff 9-day Weather Forecast 9-day Weather Forecast Updated at 11:30 HKT
Date
20 Nov
Mon
21 Nov
Tue
22 Nov
Wed
23 Nov
Thu
24 Nov
Fri
25 Nov
Sat
26 Nov
Sun
27 Nov
Mon
28 Nov
Tue
Weather Cloudy. Cool at night.Bright periods. Cool in the morning.Bright periods. Cool in the morning and at night.Mainly cloudy. Cool in the morning and at night.Mainly cloudy with one or two rain patches. Cool in the morning and at night.Mainly cloudy with one or two rain patches. Cool in the morning.Sunny intervals.Sunny intervals.Sunny intervals.
Temp (°C)
17 - 20
16 - 20
17 - 21
16 - 19
16 - 19
17 - 21
19 - 23
18 - 22
17 - 21
RH (%)
70 - 85
60 - 80
55 - 75
55 - 75
60 - 85
70 - 90
65 - 85
60 - 80
60 - 80
Weather Information
Map (Astronomical Observation Hot Spots Astronomical Observation Hot Spots) Updated
0
Latest starmap


Astronomical Events
(Recent 30 days)
Current Moon Phase
Times of Rise & Set
Yesterday
Astro. TwilightBeginEnd
SunRiseSet
MoonRiseSet
MercuryRiseSet
VenusRiseSet
MarsRiseSet
JupiterRiseSet
SaturnRiseSet
Times of Rise & Set
Today
Astro. TwilightBeginEnd
SunRiseSet
MoonRiseSet
MercuryRiseSet
VenusRiseSet
MarsRiseSet
JupiterRiseSet
SaturnRiseSet
Times of Rise & Set
Tomorrow
Astro. TwilightBeginEnd
SunRiseSet
MoonRiseSet
MercuryRiseSet
VenusRiseSet
MarsRiseSet
JupiterRiseSet
SaturnRiseSet
 
 
 
 
 
 
Notes:
 
  1. The webpage is best viewed by the following browsers. If your browser is not supported, you may not be able to use some special features and the response could be relatively slow. Presentation of the webpage may vary according to different browsers, computers and operating systems.
    • Internet Explorer 8,9, 10 or 11
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  2. All astronomical information is calculated for mean sea level at latitude 22°18'7.3", longitude 114°10'27.6", which is the location of the Hong Kong Observatory, based on astronomical data provided by the HM Nautical Almanac Office, United Kingdom and the United States Naval Observatory.

  3. The night sky brightness (NSB) is measured by the SQM-LE Night Sky Brightness monitors at the monitoring stations on the Hong Kong Night Sky Brightness Monitoring Network (NSN) and the Globe at Night - Sky Brightness Monitoring Network (GaN-MN); smaller value represents brighter sky while larger value represents darker sky. Detailed information can be found at http://nightsky.physics.hku.hk/hk-light-pollution-map.php and http://globeatnight-network.org/

  4. "The latest star map information" is updated every 5 minutes automatically.

  5. "The daily rise and set times of the celestial bodies" shows the times of rise and set of the celestial bodies on the current day.

  6. "The information of special astronomical phenomena" shows the special astronomical events in the coming 30 days but not all events can be observed in Hong Kong. The information will be updated whenever there are any other ad hoc events or events of public interests.

  7. The air temperature and relative humidity of each astronomical observation hot sport is using observation of the nearest automatic weather station(s) close to sea level operated by the Hong Kong Observatory.

  8. From sunset every day to sunrise the next day, the night sky brightness provided by the Department of Physics of the University of Hong Kong is updated once every 5 minutes by the median value of the night sky brightness of the past 15 minutes.  The night sky brightness data is only available at night time.

  9. The information of the "Astronomical Observation Weather Information" website is jointly provided by the Hong Kong Observatory, the Hong Kong Space Museum, the Department of Physics of the University of Hong Kong and and Ho Koon Nature Education cum Astronomical Centre. The information is for general only.

  10. The background geographical information on this page comes from Google Maps and the usage is subject to Google's Terms of Use. The downloading speed depends on the responsiveness of its servers and sometimes it may take a longer time to complete the download.

  11. This webpage is jointly organized by the Hong Kong Observatory, Hong Kong Space Museum, Department of Physics of the University of Hong Kong and Ho Koon Nature Education cum Astronomical Centre.

  12. For enquiries on astronomical service, please contact Scientific Officer (Geophysics Services) at 2926 8433

    Office Hour:
    Monday to Friday 8:30am to 5:45pm
    Closed on Saturday, Sunday and public holidays

 





 
Rainfall 
 Legend
  Nil or Rainfall less than 0.5mm Rainfall more than 0.5mm
+0.5 hours +1 hours +1.5 hours +2 hours   < 0.5 mm ≥ 0.5 mm  


Air Temperature



Relative Humidity



Wind Speed / Wind Direction


 
 
Notes:
 
  1. The information of rainfall forecast is updated every 12 minutes automatically. In reality, heavy rain can develop very rapidly. Significant intensification or weakening, or even changes in the direction and speed of storm movement may occur within the forecast period. Should such development happen, large forecast errors are likely to result. This is a limitation that existing weather forecasting science and technology cannot lift yet. Rainfall forecast is generated automatically by computer without any manual adjustment. The main purpose is to provide the first instance the latest available information for users preliminary reference. From the Observatory's forecast verification result, the accuracy of the rain forecast in the first half hour would be about 75 %, depreciating to lower values as the forecast range increases through one to two hours. It may be different from the other weather information disseminated by the Observatory for the general public of Hong Kong. The user should not assess the likelihood of rainstorm or other warnings based on the rain forecast information directly. For taking precautionary actions against inclement weather, the public is reminded to refer to the latest local weather forecasts, special weather tips and severe weather warnings issued by the Hong Kong Observatory.

  2. The information of temperature, humidity, wind speed and wind direction in the Automatic Regional Weather Forecast is updated twice a day at about 0400H and 1600H local time (the 1st day). The former provides hourly forecasts from 0500H the same day to 0500H of the 3rd day. The latter provides hourly forecasts from 1700H the same day to 1700H of the 3rd day.

  3. In the time series chart for wind speed/wind direction, the black arrow represents the hourly forecast wind direction. "←" and "↓" indicate easterly and northerly winds respectively.

  4. The Automatic Regional Weather Forecast shows the general weather situation over the stargazing hot spots as forecast by the model. The weather conditions described by the products may be different from those recorded at individual weather stations within the grid box and the weather forecasts issued by the Observatory.

  5. Minimal quality control and screening of the computer model generated forecast products are carried out by the Observatory's staff to ensure that the forecasts are within acceptable range. No manual adjustment is made during the whole process. Details of the computer model can be found at the following website (http://www.hko.gov.hk/nhm/mesomodel_e.htm)