@rwilabee If you enable water budgeting on your schedule we will, on a weekly basis, increase or decrease your watering times based on real time weather data.
http://support.rachio.com/article/282-water-budgeting-and-evapotranspiration-watersmart
We are releasing a 2.0 version of the app very soon with a concept called flex schedules. These schedules will automatically adjust the watering frequency. Hotter months we will water more frequent, cooler months we will water less frequently. Stay tuned!