Netro gets weather forecast data from our weather provider, which could be not accurate enough, as weather forecasting is challenging.
You can check the weather data on the home tab. If it is not correct, you can select other weather provider in settings->weather provider, you can also select the weather station ID with the Wunderground option.
With incorrect weather data, Netro’s smart algorithm could be not optima. Like you said, still watering while raining.
You can also adjust the rain data through Discover page->"+" button on the upper right corner-> Correct rainfall.