All of Solcast's data products are 'Rapid Update', meaning we update all of our live and forecast data every 5-15 minutes, depending on where you're located in the world:

These updates apply to the 4 hours of our forecasts data and the most recent interval of the live data. These updates occur with each new satellites scan, and include updates to each of the members of our probabilistic forecasting ensemble (representing in the P10 and P90 data in the forecasts).