Each forecast (PWG, PWE, GFS, SPIRE, UKMO & ECMWF) is updated twice a day, every 12 hours.
You can see the update times for your GMT time zone at https://help.predictwind.com/en/collections/1680701-faq-s#forecast-update-times
The next forecast update time is displayed in the PredictWind Website and PredictWind App. Details can be viewed in real time, and are written below the forecast location name.