@Boris, we will soon start working on integrating Shawn’s ET weather algorithm with OpenSprinkler:
https://opensprinkler.com/forums/topic/penmen-monteith-eto-method-python-script-for-possible-use-as-weather-script/
The ET algorithm will estimate the amount of water needed for each zone, taking into account weather data and how much it has watered each zone in the past few days. So that will in some sense cover your request.