His career started with Dunfermline Athletic, the club he supported as a boy, and, while there, he spent time on loan at Dumbarton and Stirling Albion. After signing for Brechin City on a permament basis he was instrumental in guiding them to the Scottish First Division in season 2002-03.
Greenock Morton then paid a "considerable fee" (believed to be £100k) for Templeman made all the more amazing that Stevie Crawford, then a Scotland international, was bought by Dundee United in the same week for the same amount.
After a poor start at Cappielow, punctuated by a return to Brechin City on loan, Templeman became a regular starter and important player at Cappielow, his most famous goals probably being his double against SPL side Kilmarnock FC in the Scottish Cup Third Round, where Morton won 3-1.
However by the start of the 2007-08 season, with Morton having won promotion to the First Division, Templeman's playing time began to decrease, largely in favour of Peter Weatherson and Iain Russel. He came on frequently as a substitute in the second half, notching up three goals in cup competitions.