The rupee on Thursday weakened marginally against the US dollar, tracking losses in the Asian currencies market. At 3.30 pm, the local currency was trading at 64.85 a dollar, down 0.05% from its previous close of 64.84. The home currency opened at 64.93 a dollar and touched a high and a low of 64.81 and 64.98 respectively. Yields on 10-year government bonds was at 7.649% compared to Wednesdays close of 7.685%. Bond yields and prices move in opposite directions. Traders are awaiting trade deficit data for February due later in the day. According to a Bloomberg survey, for February, deficit will be at $14.20 billion from Januarys $16.30 billion shortfall. Year to date, the rupee has weakened 1.6%, while foreign investors have bought $1.39 million in equity and sold $137.80 million in debt markets.