FILE PHOTO: Leader of the Norway's opposition Labour party Jonas Gahr Stoere poses for a picture in parliament in Oslo, Norway May 30, 2017. REUTERS/Gwladys Fouche

OSLO (Reuters) - Norway’s opposition Labour Party lost support in three opinion polls on Thursday, leaving wide open the race against the ruling right-wing coalition in September’s election.

For much of the year, Labour and its center-left allies were ahead in the polls and favored to replace Conservative Prime Minister Erna Solberg, but support for the opposition has slipped as the economy gradually recovered.

(For a graphic on Norway parliamentary elections click tmsnrt.rs/2ugJCjo)

While surveys by broadcaster TV2 and tabloid VG pointed to a narrow victory for Labour leader Jonas Gahr Stoere, a poll in daily Aftenposten indicated Solberg would win.

The three polls gave Labour support between 27.3 and 27.9 percent, down from a 28.1-30.5 percent range earlier this month and from levels around 35 percent at the start of the year.

With two and a half weeks to go, even small changes in support for some of the nine parties on the left and right could be decisive.