Our sever side gets and updates weather information every early morning at 4 am. We checked the rain data on Darksky and you are right it's expected to rain less than your threshold. Previously Netro has not updated the weather information and now we have updated it for you now.
Netro will re-check the weather data for the past, update our model, and adjust following schedules accordingly. For example, Netro may not water today due to large rainfall from forecast data. The next day, Netro re-check the weather data, if no rainfall found and your soil is dry enough, Netro will water accordingly.
You can also raise your rain threshold. Please let us know if you have any further questions.