Rainstorm and a drastic drop in temperature levels are likely to affect many Chinese regions, according to the National Meteorological Centre.
A wide-range inclement weather is also expected to impact downstream steel consumption.
Moreover, fears of China's state planner issuing another warning to rein in iron ore prices undermined overall sentiment, analysts said.
China's National Development and Reform Commision issued several warnings on iron ore hoarding and speculative activities in the past month on rising prices.
The most-traded May iron ore futures contract on the Dalian Commodity Exchange (DCE) DCIOcv1 ended the morning trading session 1.43% lower at 896 yuan ($130.02)a tonne, following a nearly 5% jump in the past week.
