Aurora borealis
As autumn draws on and temperatures drop below zero, on a clear night you are likely to be treated to a dazzling display of northern lights. The best displays are mostly late in the evening in very cold and still conditions, when the level of aurora activity is high enough. Due to the bright summer nights, it is difficult to see the aurora from approximately the first of May until the 10th of August. On the following website you can find the aurora forecast for Iceland for the next few days.
http://www.gi.alaska.edu/AuroraForecast/Europe/
http://www.gi.alaska.edu/AuroraForecast/Europe/