Chinese stocks could climb as much as 20 percent by the first quarter of 2013 after having bottomed in early June, and investors looking for a window to buy should dip in now, according to Japanese brokerage Nomura.

An investor smiles at a stock exchange hall on August 10, 2011 in Shenyang, Liaoning Province of China.

However, this will be a short-term bounce, Nomura warned, and the market could give up most of these gains after March. This is because inflationwill creep back up to 4 percent for much of 2013 and China will need to put up with slower growth in order to implement reforms, Research Analysts Wendy Liu and Vicky Fung said in a report published on Monday.