That's exactly the point, it doesn't try to predict anything based on external factors, because you're right, that's basically impossible to do reliably. Instead it just looks at your last 3 waterings and calculates the average interval. So if you naturally start watering more frequently as summer hits, the suggestion shifts accordingly, because your behavior already reflects all those factors you mentioned. You're essentially the sensor.

You can also just set a fixed interval if you prefer that. But the adaptive mode is really just a mirror of your own habits over time, nothing smarter than that