The same source as any other forecast-related websites. For wind, temperature, waves, etc there is just THE ONE: https://en.wikipedia.org/wiki/Global_Forecast_S

The same source as any other forecast-related websites. For wind, temperature, waves, etc there is just THE ONE: https://en.wikipedia.org/wiki/Global_Forecast_System https://en.wikipedia.org/wiki/Global_Forecast_System There is a very big industry build on it. All are happy this data is complex, but very complete and very free :-)