ZigWeather gives you a multi-widget to show weather on your site.
WP Cloudy is a powerful weather plugin for WordPress, based on Open Weather Map API, using Custom Post Types and shortcodes, and much more.
Give your WordPress site wind.
Get your favorite city weather in a widget with Yahoo! Weather. Easy to customize and support multi-widget.
The Windspeed Converter gives you the possibility to insert a converter via widget or shortcode into your site.