What is your Weather Station set to under “Weather Intelligence” section of http://app.rach.io interface? (you can also look it up via the app).
Comparing a specific weather station data (which has local data) to a zip code in general (which has generalized data) are unlikely to agree often. Even predictions are usually set to use the weather station data to predict things like rain.
It may be that the pressure (barometer) sensor within the weather station you are using is showing a lower pressure than it should thus making it seem that you may be getting rain.