Given first use of the wind, Boroughmuir scored 19 points with tries by the Scotland Under-21 winger Ally McLean (2) and second-row Darren Burns.
Directing operations from stand-off, Dougie Wyllie, the 33-year-old former international, continually kept Hawick turning. Another veteran ex-international, Sean Lineen, put up the barriers in midfield forcing on Hawick an expansive approach always likely to founder in the gale.
By the time Hawick roused themselves the damage had been done to a side whose spirit may well have been eroded by divisions which have opened up in the town since the trophy was brought back amid triumphant scenes last May. Many of the same townsfolk who formed the welcoming party are now at each others throats as a bitter feud over whether women should be allowed to take part in a centuries old festival shows no signs of abating.
Hawick: Penalties Sharp 2. Boroughmuir: Tries McLean 2, Burns; Conversions Aitken 2.
Hawick: G Sharp; W Coltman, A Stanger, C Murray, K Suddon; B Wear, K Read; B McDonnell, J Hay, M Landels, I Elliot, A Barnes, C Cottrill, J Parkes, B Cumming (M Johnston, 60).
Boroughmuir: C Aitken; S Reed, D Laird, S Lineen, A McLean; D Wyllie, G Beveridge; S Paris, K Allan, S Penman, D Burns, P Jennings, A Cadzow, S Reid, R Kirkpatrick.
Referee: I Ramage (Berwick).
TENNENTS SCOTTISH CUP Fifth-round draw: Glasgow Southern v West of Scotland; Boroughmuir v Stirling County; Edinburgh University v Kirkcaldy; Heriot's FP v Berwick; Peebles v Kilmarnock; Dundee HSFP v Hawick Linden; Melrose v Kelso; Gala v Watsonians. (Ties to be played Sunday 6 April).Reuse content