The Icelandic weather forecast used by locals can be found here. Please note that the weather changes really quickly in Iceland and sometimes the sun is shining, then it's raining and snowing all in the same hour. 

The aurora borealis forecast for Iceland is shown on this website. The spectacle of Aurora Borealis requires dark and partly clear skies. Here you can find the forecast for cloud cover and strenght of aurora activity. 

Safe Travel is a website where you can find information about road condtions and alerts if some roads are not serviced. In winter time most of the highland roads are closed.