Kenya is the world's leading exporter of black tea.
The crop is a main source of foreign exchange for the east African economy, together with horticultural products and tourism.
Best Broken Pekoe Ones (BP1s) sold at $2.22-$3.20 per kg compared with $2.12-$3.22 per kg last week.
Best Brighter Pekoe Fanning Ones (PF1s) fetched $2.30-$2.74 per kg from $2.30-$2.78 per kg at the last sale.
Tea Brokers said 9.88 percent of the 165,116 packages, or 10.5 million kg, remained unsold. That compares with 16.31 percent of the 170,461 packages, or 10.88 million kg, that were unsold last week.
Most of the tea offered at the Mombasa auction is from Kenya, but tea from Uganda, Tanzania, Rwanda, Burundi and other regional producers is also sold.