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Above all, the rule for Shanghai is to lay low during, or altogether avoid the Chinese New Year; the city grinds to a halt and public transport is flooded. The rest of winter offers good hotel discounts and few tourists.
Summer is peak season and gets a bit muggy, while from September to November the temperate weather brings out several interesting arts festivals and fairs. These are probably the best months to visit but trade fairs and conventions do little to bring the prices down from peak season.
