Most people are used to the fact that the planet spins, and day changes to night. That's, of course, not the case in Greenland due to its geographical position — the large part of the island is inside the Arctic Circle. In summer the sun never really sets down, creating a natural phenomenon called the midnight sun. In the evening the bright daylight turns into a warmer and softer light, but the sun remains above the horizon.
The phenomenon could be witnessed the best at northernmost spots like Qaanaaq, Upernavik and Uummannaq. But even in the most southern parts of the island below the Arctic circle, the effects are still felt. The midnight sun and the constant light creates an interesting feeling of energy and freshness, and you can easily stay up all night. Greenlanders try to take in as much sunlight as possible during this period, so they spend a lot of time outside. If you come to Greenland, you'll be able to try various outdoor activities at night which may seem unusual but is quite spectacular. In Aasiaat, you can even run a marathon that is usually held in late June.
If you are wondering when to see Midnight Sun in Greenland, keep in mind that timing depends on your location. In Greenland’s northernmost towns you can spot midnight sun roughly from late April through late August. The settlements closer to the Arctic Circle, the midnight sun occurs between early June and mid-July. So, aiming for the summer months would be your best bet.