The Christian Democrats, who had been polling well under the 4 per cent threshold, are now surging to 5.7 per cent.
Swedish Radio's political commentator Fredrik Furtenbach says one explanation behind their climb may be that such small parties benefit from a lot of attention during the election campaign. Plus, the Christian Democrats may be benefiting from tactical support from other voters, who want the centre-right to be larger than the current red-green government, Furtenbach adds.
The Greens are also out of the danger zone, polling 5.4 per cent, and the Liberals have risen to 6 per cent.
But the Sweden Democrats, who had been polling as high as 25 per cent in some reports, have shrunk for four months in a row and are on 17.7 per cent, a whisker below the center-right Moderate Party.
The Social Democrats seem headed for a historically low result, polling just 25.5 per cent, while the Left Party may possibly double its share from the last election, polling just over 10 per cent.
With the Center Party shrinking slightly to 8.8 percent the Alliance as a whole is polling 38.3 per cent, compared with the government's 30.9 percent.
Government predictions are unusually tricky as vote nears2:53 min 2:53 min
Christian Democrats and Greens make it above electoral threshold2:51 min 2:51 min