You can get the MLX90614 (cloud sensor part of the Weather Radio) in narrow field of view version. The standard part has a 90 degrees FOV but the MLX90614 is also available in 10 or even 5 degrees FOV.

What I am coming at is that a specialized/limited version of the Weather Radio could be built with a narrow FOV MLX90614 that would be put on the same axis and in from of the telescope tube. That could give you a good idea of the cloud cover in the FOV of the telescope, and the standard Weather Radio would give you an idea of the general cloud cover.

Ideally though, an all-sky (thermal?) camera with cloud detection/mapping over the KStars window would be preferred but... that's another story. :)

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