I've seen 7 total eclipses, almost all booked at the last minute -- it's definitely possible.
The one thing to be wary of in Spain is how low it will be on the horizon. If you see it that will be spectacular, but as you know, you have a much higher chance of clouds there. Climate maps can start your planning but a week out from eclipse time use actual weather forecasts rather than climate predictions.
weather.us lets you see all the different supercomputer models in one site, and ask them about specific cloudcover, though not so easily about direction of clouds.
Of course, never, ever photograph a total eclipse. If you are skilled at it, and have seen several, it's OK to have your computer photograph the eclipse while you watch it. You should never photograph it yourself. Get out your eyes and binoculars and watch. Moving at the last minute to escape clouds may mean your photography plans get scuttled, but better to see it than photograph clouds. My computers have taken some great pictures, but I was watching. I foolishly watched half of my 3rd eclipse through the viewfinder.