Yes, but not very well because they were bred for pulling sleds.
Siberian Huskies are naturally excellent swimmers! They could never have pulled sleds in cold water when living with the indigenous people of Alaska. They love swimming, and often seem to alternate between running around onshore and then running into the water again after giving out a few quick barks to remind you that they expect you to continue following them - just in case there is something worthwhile over by the horizon...