Yellowknife is the best place in the world to view the aurora borealis, also known as the Northern Lights. With our long and clear winter nights, mid-November to the beginning of April tend to be the best times of the year to visit for a good viewing. Late summer to early autumn often also offers a good chance of seeing the lights.
For the day to day forecast, visit Astronomy North's website, and if you are going for a walk around town, be sure to keep an eye out for Northern Lighthouses. These tiny lighthouses, located throughout the city, alert visitors and residents when active aurora is in the evening forecast.