It’s easy to do, you just have to define “weather” in a way that is actionable.
A lot of people use a lux sensor and only close the blinds during the daytime if the light level is above a certain number. You can do that with the official smart lighting feature.
But then you do need a device capable of measuring the light level.
If you don’t want to add another device, the IFTTT service has a free
Weather channel who’s triggers include a change to “cloudy.” In that case, the simplest way to handle things would be to have that trigger change the mode, but you might end up setting up a lot of different modes in that case.
Core is a community created rules engine which is very powerful, and which I suspect could take either the IFT TT notification or the Lux sensor and give you a “while” condition. You should ask in the peer advice thread for that. ( Core calls and individual rule a “piston.”)
There are other ways to do it as well, so again, it just comes down to the first question of how are you defining “weather.”
