The weather in Shanghai is overall mild and moist all year round, but is often grey and overcast. It has four distinct seasons-a warm spring, a hot rainy summer, a comfortable cool autumn and mild winters-with an average temperature of about 18 °C.
The time from the late September to November (Autumn) boasts comfortable temperature and lacks the crowds and rain showers of summer, making it the best time to visit. The rising temperature of spring offer a short sweet spot for travel. When visit Shanghai in winter, you may encounter the chilly weather; while in summer, you must stand the heat. So it is necessary to check out the weather forecast while planning your Shanghai tour.
Spring (March - May) brings warming days and welcomes the beautiful blossoms that reside in the city's parks, making March to mid-May probably one of the best times to visit weather-wise. There is moderate rainfall. Sweaters and coats are suitable for this season, but prepare lighter clothes for warmer days.
Take a walk along the bund or cruise on the Huangpu River. Also, you can go to Zhujiajiao Water Tower or Yuyuan Garden to enjoy the spring green scenery. Besides,you could have fun in Shangai Disney Resort or get some fresh air in the Shanghai Botanical Garden with your family and friends.
Summer (June-Sept.) may be is the peak travel season of Shanghai, but the hot and humid weather makes conditions outside uncomfortable, with temperatures sometimes as high as 40°C (104°F) in July and August. The heat, a damp saunalike heat, is draining. June brings"plum rains", saturating downpours that send pedestrians scrambling for cover as streets turn to rivers. It is recommended that you'd better carry an umbrella with you if rainfall seems likely. Wear summer clothes like skirts, shorts and T-shirts. Wearing sunglasses and using sunscreen is recommended for those susceptible to burning.
Visiting Yuyuan Garden or go boating on the river of Zhujiajiao Water Town or Fengjing Water Town is very relaxing in summer. Also, you can go to visit Shanghai Museum, Shanghai Urban Planning Exhibition Center to learn more about the history of the whole China and the future of Shanghai as well as to escape from the summer heat. What's more, you can take a slight walk along the Old French Concession to spend a leisure time with the pretty international buildings.
Autumn (late September to mid-November) is also very pleasant, but it can still be very hot in September. The weather is generally sunny and drier. Autumn is the season with sharp and frequent temperature changes. Long-sleeve T-shirts and then sweaters or coats are needed as the season progresses.
The area's fall foliage begins at the end of this season and continues to early December. See fall foliage in Shanghai. Get some serene in the Jade Buddha Temple. Visit the world high skyscrapers like Shanghai Tower, Shanghai World Financial Center, Jinmao Tower, Oriental Pearl Tower, and so forth in Lujiazui is also recommended.
Winter is from December to February of the next year. Winter in Shanghai is characterized by bitingly cold northerlies and dryness. You'll need down jackets for winter.
You could join the Chinese New Year and Spring Festival from late January until early February. And during this season, you can visit Zhujiajiao Water Town and Yuyuan Garden that are very antique and charming in winter.