Red Sky at Night -- sailor's delight and many more
"How to Predict the Weather Without a Forecast
Long before technology was developed to predict the weather, people had to rely on observation, patterns and folklore to avoid being caught off guard by the elements. If your plans, livelihood or even your survival depend on the weather, it certainly wouldn't hurt to become familiar with some of these methods, especially since you never know when you might be out of touch with the local weather report. These methods aren't foolproof, but they have their usefulness, and if you don't have a forecast on hand, what do you have to lose by trying them?"
More... How to Predict the Weather Without a Forecast - wikiHow: