Average Weather in Hong Kong Hong Kong SAR China
In Hong Kong, the wet season is hot, oppressive, and overcast and the dry season is comfortable, windy, and mostly clear. Over the course of the year, the temperature typically varies from 57°F to 89°F and is rarely below 49°F or above 93°F.
The hot season lasts for 4.7 months, from May 19 to October 11, with an average daily high temperature above 85°F. The hottest day of the year is July 17, with an average high of 89°F and low of 81°F.
The cool season lasts for 3.0 months, from December 11 to March 10, with an average daily high temperature below 71°F. The coldest day of the year is January 23, with an average low of 57°F and high of 66°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
In Hong Kong, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.
The clearer part of the year in Hong Kong begins around September 28 and lasts for 6.9 months, ending around April 26. On January 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 72% of the time, and overcast or mostly cloudy 28% of the time.
The cloudier part of the year begins around April 26 and lasts for 5.1 months, ending around September 28. On June 6, the cloudiest day of the year, the sky is overcast or mostly cloudy 86% of the time, and clear, mostly clear, or partly cloudy 14% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Hong Kong varies significantly throughout the year.
The wetter season lasts 5.7 months, from April 3 to September 23, with a greater than 31% chance of a given day being a wet day. The chance of a wet day peaks at 55% on June 14.
The drier season lasts 6.3 months, from September 23 to April 3. The smallest chance of a wet day is 7% on January 2.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 55% on June 14.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Hong Kong experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year in Hong Kong. The most rain falls during the 31 days centered around June 10, with an average total accumulation of 9.8 inches.
The least rain falls around December 24, with an average total accumulation of 0.8 inches.
Average Monthly Rainfall
The length of the day in Hong Kong varies over the course of the year. In 2017, the shortest day is December 22, with 10 hours, 46 minutes of daylight; the longest day is June 21, with 13 hours, 30 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:38 AM on June 7, and the latest sunrise is 1 hour, 27 minutes later at 7:05 AM on January 16. The earliest sunset is at 5:38 PM on November 27, and the latest sunset is 1 hour, 33 minutes later at 7:11 PM on July 4.
Daylight saving time (DST) is not observed in Hong Kong during 2017.
Sunrise & Sunset with Twilight
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
Hong Kong experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 8.1 months, from March 15 to November 19, during which time the comfort level is muggy, oppressive, or miserable at least 27% of the time. The muggiest day of the year is July 30, with muggy conditions 100% of the time.
The least muggy day of the year is January 15, with muggy conditions 2% of the time.
Humidity Comfort Levels
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Hong Kong experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 5.5 months, from September 29 to March 15, with average wind speeds of more than 6.0 miles per hour. The windiest day of the year is December 9, with an average hourly wind speed of 7.2 miles per hour.
The calmer time of year lasts for 6.5 months, from March 15 to September 29. The calmest day of the year is August 20, with an average hourly wind speed of 4.9 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Hong Kong varies throughout the year.
The wind is most often from the south for 4.1 months, from April 24 to August 28, with a peak percentage of 71% on June 26. The wind is most often from the east for 7.9 months, from August 28 to April 24, with a peak percentage of 52% on January 1.
Hong Kong is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 4.5 months, from May 30 to October 14, with an average temperature above 80°F. The day of the year with the warmest water is August 9, with an average temperature of 83°F.
The time of year with cooler water lasts for 3.5 months, from December 11 to March 28, with an average temperature below 70°F. The day of the year with the coolest water is January 23, with an average temperature of 66°F.
Average Water Temperature
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences some seasonal variation over the course of the year.
The brighter period of the year lasts for 1.7 months, from April 1 to May 23, with an average daily incident shortwave energy per square meter above 5.3 kWh. The brightest day of the year is April 30, with an average of 5.6 kWh.
The darker period of the year lasts for 2.5 months, from November 23 to February 9, with an average daily incident shortwave energy per square meter below 4.3 kWh. The darkest day of the year is December 18, with an average of 4.0 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Hong Kong are 22.286 deg latitude, 114.158 deg longitude, and 59 ft elevation.
The topography within 2 miles of Hong Kong contains very significant variations in elevation, with a maximum elevation change of 1,909 feet and an average elevation above sea level of 324 feet. Within 10 miles contains very significant variations in elevation (3,258 feet). Within 50 miles contains large variations in elevation (3,369 feet).
The area within 2 miles of Hong Kong is covered by water (38%), trees (29%), and artificial surfaces (22%), within 10 miles by water (59%) and artificial surfaces (22%), and within 50 miles by water (72%) and trees (13%).
This report illustrates the typical weather in Hong Kong, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There is only a single weather station, Hong Kong International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Hong Kong.
At a distance of 25 kilometers from Hong Kong, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Hong Kong according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.