This global web site presents OFFICIAL weather observations, weather forecasts and climatological information for selected cities supplied by National Meteorological & Hydrological Services (NMHSs) worldwide. The NMHSs make official weather observations in their respective countries. Links to their official weather service web sites and tourism board/organization are also provided whenever available. Weather icons are shown alongside worded forecasts in this version to facilitate visual inspection.

The media are welcome to make information presented in this web site available to the public. When doing so, credit to the respective NMHSs should be given.

By December 2016, WWIS provided official weather information for 2123 cities in which 1993 cities are available with forecast from 135 members while 1953 cities are available with climatological information from 169 members. Suggestions to enrich the contents of this web site are welcome.