Best Time to Visit Known as one of the stove cities in China, Nanjing is very hot in the summer, with its highest temperature at 35 °C (95 °F) on average days. By contrast it is very cold in winter. And the rainy season comes from late June to mid July. So the best time to visit the city is spring and autumn. Spring is good for seeing flowers, while autumn is best for seeing laurel blossoms and red maples as well as for tasting aquatic products and fruit.