The 225-issue Nikkei average soared Wednesday, ending at a nearly 34-year high for a second consecutive day, as the yen's weakness against the dollar sparked aggressive buying of exporters.

The Nikkei ended up 678.54 points, or 2.01%, from Tuesday at 34,441.72, its highest close since February 1990, when Japan was experiencing an asset price bubble.

The broader Topix index finished up 31.39 points, or 1.30%, at 2,444.48, its highest close since March 1990.