Okay, clouds are may not be on your list of favorite things to photograph, but even a quick look at the photos here will show how their shapes, colors and textures can make for creative, striking images. The time of day is going to have a lot to do with the look of cloud photos. There's a good chance we'll get strong colors and dramatic color effects at or near sunrise and sunset. The time of year will play an important part also.
I've looked at the sky, clouds and weather activity as almost a language. if you understand clouds, you can look at the sky and get an idea of what to expect, weather wise, that hour, later in the day, sometimes the next day.