The port handled 23.3 million tonnes of goods in January-June 2010 - a 1.3% rise on the figure for the first half of last year, the Port of London Authority (PLA) said.
In the whole of 2009, London handled 45 million tonnes, 14% down on 2009 and the lowest annual amount since 1992.
PLA chief executive Richard Everitt said: "This result is consistent with the modest recovery in economic activity that we have seen since the middle of last year.
"Interesting trends to draw out include the continued fall in throughput of building materials, consistent with the low level of construction activity.
"In marked contrast, container and other unitised cargoes showed very strong growth, underlining the attraction of London as a centre for trade."
He went on: "The uncertainties coming from the cuts to public sector spending make it difficult to predict the likely full-year trade figures.
"Nevertheless, the port continues to attract investment, with dredging for DPWorld's £1.5 billion London Gateway container port scheme on the north bank of the river now well under way."