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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 daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature in Hong KongJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMhotcoolwarmcomfortable
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

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

Cloud Cover Categories in Hong KongclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jan 372%Jan 372%Jun 614%Jun 614%Sep 2843%Sep 2843%Apr 2643%Apr 2643%clearpartly cloudymostly cloudyovercastmostly clear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

Daily Chance of Precipitation in Hong KongwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jun 1455%Jun 1455%Jan 27%Jan 27%Jan 17%Jan 17%Apr 331%Apr 331%Sep 2331%Sep 2331%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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 average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

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 number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

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

Sunrise & Sunset with Twilight in Hong KongJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 75:38 AMJun 75:38 AM7:11 PMJul 47:11 PMJul 4Nov 275:38 PMNov 275:38 PM7:05 AMJan 167:05 AMJan 16daynightnightnightnight
The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Humidity

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

Humidity Comfort Levels in Hong KongmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 152%Jan 152%100%Jul 30100%Jul 30Mar 1527%Mar 1527%Nov 1927%Nov 1927%drydrymiserablemiserablecomfortablecomfortablehumidhumidmuggymuggy
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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

Average Wind Speed in Hong KongwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mphDec 97.2 mphDec 97.2 mphAug 204.9 mphAug 204.9 mphSep 296.0 mphSep 296.0 mphMar 156.0 mphMar 156.0 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

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.

Wind Direction

Wind Direction in Hong KongESEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%southnortheastwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

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

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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

Average Daily Incident Shortwave Solar Energy in Hong KongbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhApr 305.6 kWhApr 305.6 kWhDec 184.0 kWhDec 184.0 kWhFeb 94.3 kWhFeb 94.3 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

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%).

Data Sources

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.

Other Data

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.