Mac: Just because you're a command line power user doesn't mean you don't need to know what the weather forecast is. Wego is a weather app for Terminal that displays the weather in a variety of ways and looks great doing it.
Wego uses ASCII art to display the weather, but just because it's a simple Terminal app doesn't mean it doesn't have a lot of information. You can display up to a five day forecast, get information about wind, temperature, precipitation amount, and plenty more. It's a nice, lightweight means to keep an eye on the upcoming forecast without needing to boot up a browser.