Bureau of Meteorology portal for GovHack 2017

Real-time Forecast Data API: The specific types of forecast information provided includes the temperature, and the amount of expected rainfall, on a per-three-hour basis. The daily maximum and minimum temperature are also available.
Verification Dataset: The verification dataset contains two years of matched forecast and observations at various key locations around the country.
Geospatial APIs: Geofabric, digital database of surface and groundwater features that registers the spatial location and relationships between important hydrologic features, such as rivers, water storages, catchments and aquifers.