The 23-year-old, who joined Barnsley earlier this summer from Colchester United, had turned down a permanent move to the Posh earlier in the summer.
The West Ham United academy product made 51 goals for Colchester last season, scoring 14 goals in the process.
Moncur joins Peterborough, currently seventh in the League One table, having made two appearances for the Tykes.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Birmingham CityBirmingham | 28 | 20 | 6 | 2 | 50 | 19 | 31 | 66 |
| 2 | Wycombe WanderersWycombe | 29 | 17 | 8 | 4 | 55 | 30 | 25 | 59 |
| 3 | Wrexham | 29 | 16 | 7 | 6 | 43 | 25 | 18 | 55 |
| 4 | Stockport CountyStockport | 31 | 15 | 9 | 7 | 47 | 30 | 17 | 54 |
| 5 | Charlton AthleticCharlton | 30 | 14 | 8 | 8 | 40 | 29 | 11 | 50 |
| 6 | Huddersfield TownHuddersfield | 29 | 14 | 7 | 8 | 41 | 26 | 15 | 49 |
| 7 | Leyton Orient | 29 | 14 | 5 | 10 | 43 | 25 | 18 | 47 |
| 8 | Bolton WanderersBolton | 30 | 14 | 5 | 11 | 47 | 46 | 1 | 47 |
| 9 | Reading | 30 | 13 | 7 | 10 | 44 | 42 | 2 | 46 |
| 10 | Barnsley | 30 | 12 | 7 | 11 | 42 | 41 | 1 | 43 |
| 11 | Blackpool | 30 | 9 | 13 | 8 | 42 | 41 | 1 | 40 |
| 12 | Lincoln CityLincoln | 30 | 10 | 10 | 10 | 36 | 35 | 1 | 40 |
| 13 | Stevenage | 29 | 11 | 7 | 11 | 28 | 30 | -2 | 40 |
| 14 | Rotherham UnitedRotherham | 30 | 10 | 8 | 12 | 34 | 35 | -1 | 38 |
| 15 | Mansfield TownMansfield | 29 | 11 | 4 | 14 | 35 | 38 | -3 | 37 |
| 16 | Wigan AthleticWigan | 28 | 9 | 7 | 12 | 27 | 28 | -1 | 34 |
| 17 | Northampton TownNorthampton | 30 | 8 | 9 | 13 | 29 | 45 | -16 | 33 |
| 18 | Exeter CityExeter | 29 | 9 | 5 | 15 | 33 | 46 | -13 | 32 |
| 19 | Bristol Rovers | 29 | 9 | 5 | 15 | 29 | 45 | -16 | 32 |
| 20 | Peterborough UnitedPeterborough | 30 | 8 | 6 | 16 | 46 | 57 | -11 | 30 |
| 21 | Shrewsbury TownShrewsbury | 30 | 7 | 6 | 17 | 31 | 50 | -19 | 27 |
| 22 | Crawley TownCrawley | 29 | 7 | 6 | 16 | 33 | 53 | -20 | 27 |
| 23 | Burton Albion | 30 | 5 | 11 | 14 | 31 | 45 | -14 | 26 |
| 24 | Cambridge UnitedCambridge | 30 | 5 | 8 | 17 | 30 | 55 | -25 | 23 |
| > League One Full Table | |||||||||
