Intensive course in the summer may merely result in a box tick rather than good development of skills and knowledge. You will need to fly in wind and rain so at some point so you may as well get that experience in a safe environment with your instructor while training
I would agree - if it wasn't for the fact that crap weather will simply result in lesson cancellation and a huge waste of time for everybody concerned, which is even worse for a visiting foreign pilot who is time-limited.
"Rain" can also be quite hazardous. Not the water falling from the sky, but the big dark object which it might be falling from, with 10,000fpm vertical currents inside it
Also most IMC instructors don't like flying in IMC - not least because most of the planes are knackered and with less than great avionics. All this stuff about NDB holds is all very well in the textbooks
This is why, perversely, if somebody wants to do an IR, I recommend they go to Arizona. No time wasted.
There is plenty of opportunity to practice instrument flight for real, afterwards, in a plane of one' choice, and in
non-hazardous weather of one's choice.