Oh, Yahoo! seem to provide a free API as well...have a look at both?
https://developer.yahoo.com/weather/
Change the last part in green yo where you want. Like mine for Leeds in the UK was:
select * from weather.forecast where woeid in (select woeid from geo.places(1) where text="leeds, UK")
Then at the bottom, it generates a link that will return the data (The Endpoint):
https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20weather.forecast%20where%20woeid%20in%20(select%20woeid%20from%20geo.places(1)%20where%20text%3D"leeds%2C%20UK")&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys
And I get this as the output in my browser...which you could quite easily sift through in arduino I guess...
{"query":{"count":1,"created":"2015-11-04T18:02:42Z","lang":"en","results":{"channel":{"title":"Yahoo! Weather - Leeds, GB","link":"http://us.rd.yahoo.com/dailynews/rss/weather/Leeds__GB/*http://weather.yahoo.com/forecast/UKXX0078_f.html","description":"Yahoo! Weather for Leeds, GB","language":"en-us","lastBuildDate":"Wed, 04 Nov 2015 5:19 pm GMT","ttl":"60","location":{"city":"Leeds","country":"United Kingdom","region":""},"units":{"distance":"mi","pressure":"in","speed":"mph","temperature":"F"},"wind":{"chill":"50","direction":"0","speed":"0"},"atmosphere":{"humidity":"100","pressure":"29.85","rising":"0","visibility":"0.87"},"astronomy":{"sunrise":"7:11 am","sunset":"4:26 pm"},"image":{"title":"Yahoo! Weather","width":"142","height":"18","link":"http://weather.yahoo.com","url":"http://l.yimg.com/a/i/brand/purplelogo//uh/us/news-wea.gif"},"item":{"title":"Conditions for Leeds, GB at 5:19 pm GMT","lat":"53.81","long":"-1.56","link":"http://us.rd.yahoo.com/dailynews/rss/weather/Leeds__GB/*http://weather.yahoo.com/forecast/UKXX0078_f.html","pubDate":"Wed, 04 Nov 2015 5:19 pm GMT","condition":{"code":"27","date":"Wed, 04 Nov 2015 5:19 pm GMT","temp":"50","text":"Mostly Cloudy"},"description":"\n<img src=\"http://l.yimg.com/a/i/us/we/52/27.gif\"/>
\n<b>Current Conditions:</b>
\nMostly Cloudy, 50 F
\n
<b>Forecast:</b>
\nWed - Cloudy. High: 51 Low: 45
\nThu - PM Rain. High: 55 Low: 49
\nFri - Rain. High: 60 Low: 49
\nSat - AM Rain. High: 55 Low: 44
\nSun - PM Light Rain. High: 56 Low: 46
\n
\n<a href=\"http://us.rd.yahoo.com/dailynews/rss/weather/Leeds__GB/*http://weather.yahoo.com/forecast/UKXX0078_f.html\">Full Forecast at Yahoo! Weather</a>
\n(provided by <a href=\"http://www.weather.com\" >The Weather Channel</a>)
\n","forecast":[{"code":"26","date":"4 Nov 2015","day":"Wed","high":"51","low":"45","text":"Cloudy"},{"code":"12","date":"5 Nov 2015","day":"Thu","high":"55","low":"49","text":"PM Rain"},{"code":"12","date":"6 Nov 2015","day":"Fri","high":"60","low":"49","text":"Rain"},{"code":"12","date":"7 Nov 2015","day":"Sat","high":"55","low":"44","text":"AM Rain"},{"code":"11","date":"8 Nov 2015","day":"Sun","high":"56","low":"46","text":"PM Light Rain"}],"guid":{"isPermaLink":"false","content":"UKXX0078_2015_11_08_7_00_GMT"}}}}}}