The Rain predictor has continued working well through the monsoon season. Most predictions have been a couple of hours off, though. During the last week it has predicted four rain events correctly (including the start of our 2019 Monsoon season) and has missed one (see table below in red). The Green or Red labels align with the actual time it rained at the house.
Note this is rain at my house, not just rain in the Tucson area. So that makes it a bit more challenging. For instance, on 7/30, one could see heavy rain all around the Tucson area at the times the model predicted, but it didn’t rain at my house until about 3 hrs after the last predicted time.