A government press release announcing the extension on Thursday cited "a threat to public order and domestic security" coming from an elevated terrorism threat and "deficiencies in the control of the EU's external borders" as reasons for the continued checks.
The controls mean police can question people and ask to see their IDs as they enter the country from other Schengen states at border crossings. The checks do not limit a person's right or possibility to seek asylum though.
Sweden first imposed border controls along its southern border in September 2015 when thousands of migrants were arriving each week to seek asylum. The country has extended them regularly since then.
"Urgent action" needed to fix Sweden's border controls2:17 min 2:17 min
Border controls to remain over terrorism fears2:29 min 2:29 min
Critics cast doubt over Sweden's need for continued border checks5:18 min 5:18 min