Örskär, is a Swedish island and lighthouse station located north of Gräsö on the Uppland coastline.

A large part of the island is a nature reserve and it is rich of unusual flowers such as wild orchids.

The flame in the lantern ran on colza oil lamps, and mirrors collected the light.

Its exterior position from the Swedish mainland renders in smaller seasonal variations than nearby locations.

Although it is a maritime microclimate, it is more prone to extremes in temperatures than other outlying weather stations.