Tema bulmak zor ama bunlar işini görebilir
widget
http://preview.codecanyon.net/item/better-weather-wordpress-and-visual-composer-widget/full_screen_preview/7724257
http://demo.curlythemes.com/?product=simple_weather_wordpress_plugin

https://wordpress.org/plugins/wcp-openweather/screenshots/

Tama
http://www.templatemonster.com/demo/50114.html