I live in Fremont CA, August is typically as warm (if not warmer) than July.
I checked yearly averages for precipitation, cloud cover etc, and on every parameter, August is harsher than July.
But, to my surprise, Rachio increased the interval for my drip irrigation zones from 4->5 days and 7->8 days for the zones.
The sprinkler zones remain stable.
I am totally surprised and worried for my plants.
Perhaps I need to manually help them?
Has anyone seen this?
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It could be Evapotranspiration based. Check here: Evapotranspiration - Water Management Aid
If even this shows that August is worse, then yes Rachio is making a bad decision and you will have to manually readjust.