I had previously written a comparison of various smart watering systems and have selected the Rainmachine HD-12 as my preferred option.
While there is no local support, I have been able to get the RainMachine working well here by replacing the 110v plug pack with a 240v one from Jaycar.
The RainMachine uses internet feeds for weather predictions and is very U.S,-focussed, as expected, with the majority of weather services localised to the U.S. However, being open to developers there is the opportunity to write your own weather parser for a weather service of your choice.
Here in Australia there is a weather service called Willy Weather and I have written a parser for Australia based on the JSON API from willyweather.com.au.
Instructions and code can be found here: https://github.com/safepay/rainmachine
Willy Weather provide a commercial API that uses the Bureau of Meteorology data and wraps it in a modern API framework that is easy for developers to consume. The first 5000 calls are free, then the cost varies based on data requested, but is around $0.05 per 1000 calls.
This parser I have written detects your location based on your lat/long settings and suggests the closest station ID's. You then enter and save the station ID of your choice and the parser does the rest.
I hope that this can assist anyone else looking for a local Australian weather source for their RainMachine.
I use this parser along with Open Weather Map for good results.
