Chongqing climate is as follows: early spring, hot summer, cool autumn and warm winter, with a long frost-free period and abundant rainfall.
Every year when spring is yielding to summer there is a great amount of night rain, and thus the city is famous for its 'night rain in the Ba Mountains'. On average, it has about 100 foggy days annually, so it is also famous as the 'capital of fog'.
Chongqing Climate & Weather by seasons
In Spring ( Feb-May)
The spring in Chongqing is warm but the temperature is unsettled while rising. In the early spring, it still holds the winter feature of fogs.
Average temperature: 11 – 18℃ (52 – 64℉)
Clothes: hoodies, long sleeves, jackets, jeans
In Summer (Jun-Aug)
The summer is torrid and Chongqing is regarded as one of three hottest cities along Yangtze River. It’s the season with the fewest mists in Chongqing, and the rainfall increases.
Average temperature: 27 – 38℃ (81 – 100℉)
Clothes: T-shirts, skirts, shorts, sunhats, sunglasses, sandals
In Autumn (Sep-Nov)
The temperature decreases to be cool when the autumn comes. However, there might be continuous rains in the season, while quite a few rains occur at night.
Average temperature: 21 – 28℃ (70 – 82℉)
Clothes: long-sleeve shirts, knitwear, trench coats, jackets, thin jeans
In Winter ( Dec-Feb)
Chongqing has humid and somewhat cold weather in winter. It’s rare to see a sunny day with bright sunshine.
Average temperature: 9 – 13℃ (48 – 55℉)
Clothes: sweaters, down coats, thick overcoats, winter pants, scarfs
Best Time to visit Chongqing
Chongqing together with Nanjing and Wuhan are known as the 'three furnace cities' in China, so if possible, avoid the summer months when the weather is blistering and the temperature can reach up to 40 
C .On the contrary, the summer in Chongqing is extremely hot and humid, and the winter is too bleak and foggy to enjoy the landscapes. So, March to May in spring and September to October in autumn are the best time to visit Chongqing, for the weather is pleasant with suitable humidity.
From March to October, it’s the peak season to visit Chongqing. Despite the best time to visit Chongqing in March to May and September to October mentioned above, the hot summer also welcomes many tourists, especially July and August because it’s the summer vacation in China. You will meet lots of visitors in attraction places, and cost more as the prices for airlines, attraction tickets and hotels increase.
Winter days are the low season to visit Chongqing, for it’s somewhat cold and misty. The season-off admission fees are applied at most of the attractions, meanwhile the hotel prices and air fares go down during the time, so you can spend less on your Chongqing tour. Some attractions may use the low price in only December and January, and some may apply it from November to February. Besides, in low season, you could enjoy your trip at a more leisurely pace for scenic spots wouldn’t be jammed with travelers.
The public holidays in China are the times to be avoided when you plan to travel to Chongqing. During these holidays, the attractions are usually in an overcrowded condition, and the hotel prices go up as well.