We’ve made several changes over this weekend to enable the display of weather information through System Diagnostics again (it was disabled because after switching to OWM we haven’t hooked up the OWM information to the System Diagnostics dialog). The changes are now pushed in. They should be available soon depending on how you access the controller — if you access the controller through IP directly (using a browser), it should be available now; if you use Android app, it should be available once the android app is updated; if you use iOS app, it’s under review now and should be available in a few days once it passes review.
If you think the calculated watering percentage is wrong, go to Edit Options -> Weather and Sensors, and check the Adjustment Options. It’s possible you may want to tweak the baseline parameters and the weight parameters. You can find the meaning of these parameters: