Actually the cloudy wet weather is good for your newly planted roses. Were these growing potted roses and did a lot of soil fall away from the roots when you transplanted them?
If so the soil falling off the roots took tiny feeder roots with it. This caused to bush to lose much of its ability to take up moisture, resulting in wilting leaves.
Cool, cloudy, wet weather lessens the pressure on the bush. As soon as the feeder roots grow back your bush will recover. Before you transplant next time, e-mail me for instructions on how to plant a potted rosebush without causing transplant shock.

Ok great thanks, its good to know that they'll recover :)

If they do depends on how you care for them now. If the top growth has wilted too much it would be best to prune it back considerably to even out the top growth with the roots that are left. Remove any buds or flowers as they take a lot of moisture and probably won't open anyway.
Don't fertilize.

most of the leaves that are wilting are about half wilted, very few are completely wilted through. there are a few small buds, how close to the buds should I cut them? I actually have 4 rose bushes that I planted at the same time and they all have a little bit of wilting, but only one is extensive, should I trim all of them or just the main trouble one? Thanks for all you're help

An antritranspirant spray will normally help until the roots catch up. Some people spray whenever they are planting/transplanting a rose.

Here is a link that might be useful: link for above