Local Weatherrelated sub items
Weather Forecastrelated sub items
Weather Warningsrelated sub items
Weather for Fishermen
Weather for Marinerelated sub items
Weather for Aviation
Weather Monitoring Imageryrelated sub items
GIS Weather Servicerelated sub items
Tropical Cyclone
China Weatherrelated sub items
World Weatherrelated sub items
Educational Resources
360 Tour of HKO
My Little Observatory
Decoding Radiation
A Tour of Tropical Cyclones
Cloud Appreciation by Dr Tin
International Cloud Atlas
Guided Tour
Courses and Activities for the Public
Subscription of e-Bulletins
Research Forum
PublicationsWorld Meteorological Organizationrelated sub itemsInternational Civil Aviation Organizationrelated sub items
International Atomic Energy Agency
Regional Specialized Meteorological Centre for nowcasting
South China Sea Tsunami Advisory Center
Asian Aviation Meteorological Center
Partners
Social Mediarelated sub items
Press Releases
What's New
HKO Updates
LegCo Questions and Answers
Weather Chit Chat
Observatory's Blog
Weather On-Air
Cool Met Stuff
Central Briefing
Tropical Cyclone Report Broadcast
Observatory's News
Vacancies
Tender NoticesAbout Hong Kong Observatory
HKO Corporate Video
Vision and MissionPerformance Pledges
Organizational Structure
Quality Management
Hong Kong Observatory – The Facts
Hong Kong Observatory 2024
Our Services
Programme Areas of the Observatory
History of the Hong Kong Observatory
Career@HKO
Visitors Figures
Hong Kong Observatory Open Day 2025
Local Weatherrelated sub itemsWeather Forecastrelated sub itemsWeather Warningsrelated sub itemsWeather for FishermenWeather for Marinerelated sub itemsWeather for AviationWeather Monitoring Imageryrelated sub itemsGIS Weather Servicerelated sub itemsTropical CycloneChina Weatherrelated sub itemsWorld Weatherrelated sub itemsClimate of Hong Kong
Climate Information Service
Warnings & Signals Database
Statistics of Special Weather Events
Monthly Weather SummaryClimate Forecastrelated sub items
Climate Changerelated sub items
El Nino and La Nina
Real time Radiation level in Hong Kong
Understanding Radiation
Radiation Monitoring, Assessment and Protection
Environmental Radiation Monitoring Programme
Daya Bay Contingency PlanRelated Sitesrelated sub items
Schools
Travelrelated sub items
Sportsrelated sub items
Outdoor Photography
CWOSrelated sub items
Senior Citizens
Stargazers
FoObCo-WinMy Little Observatory
Interactive Map of Storm Damage by MangkhutEducational Resources360 Tour of HKOMy Little ObservatoryDecoding RadiationA Tour of Tropical CyclonesCloud Appreciation by Dr TinInternational Cloud AtlasGuided TourCourses and Activities for the PublicSubscription of e-BulletinsResearch ForumPublicationsWorld Meteorological Organizationrelated sub itemsInternational Civil Aviation Organizationrelated sub itemsInternational Atomic Energy AgencyRegional Specialized Meteorological Centre for nowcastingSouth China Sea Tsunami Advisory CenterAsian Aviation Meteorological CenterPartnersSocial Mediarelated sub itemsPress ReleasesWhat's NewHKO UpdatesLegCo Questions and AnswersWeather Chit ChatObservatory's BlogWeather On-AirCool Met StuffCentral BriefingTropical Cyclone Report BroadcastObservatory's NewsVacanciesTender Notices
Appsrelated sub items
Personalized Website
Weather Wizard
Weather Information in Text
Weather Information in RSS
Audio Web Page
Forms
Open DataAbout Hong Kong ObservatoryHKO Corporate VideoVision and MissionPerformance PledgesOrganizational StructureQuality ManagementHong Kong Observatory – The FactsHong Kong Observatory 2024Our ServicesProgramme Areas of the ObservatoryHistory of the Hong Kong ObservatoryCareer@HKOVisitors FiguresHong Kong Observatory Open Day 2025
Mainly as the result of an unusually strong subtropical ridge over southern China, May 2021 was the hottest May in Hong Kong on record. (More……)
The increase in Arctic annual average surface temperature between 1971 and 2019 was three times the global average during the same period. (More……)
Earthquakes
Tide
Geomagnetism
Space Weather
Weather Information for Astronomical Observation
Interactive Sun Path Diagram
Astronomical Data
Interesting Astronomical Phenomena
Time Services
Calendar
Almanac
