This works for folks around the world, apparently. I typed "London" and got their results.
Simply click on the blue box ("from where the internet thinks I am"), which is below the long red box that says "SEARCH". It quickly finds you and gives you a list of sites to select from that are nearby. Pick any one and an hourly chart is given that shows all the predicted data. If the time of the eclipse (3 am for me) shows a dark blue box, and it does, then that means it should be clear skies.