Situated to the south of the Yangtze River, Jiujiang has a subtropical climate. The average annual temperature is 17℃ (62.6℉). January is the coldest month with a mean temperature of about 5℃ (41℉), and July is the hottest month with a mean temperature of about 29℃ (84.2℉).
Since it is sultry and rainy in summer and cold in winter, the best time to visit Jiujiang is in late spring and autumn. However, the situation is different in Mt. Lushan, which has four distinct seasons. Therefore it is pleasant to visit anytime, depending on your preference.
Detailed information about the Average, Maximun and Minimum Temperatures and the rainfall in Jiujiang.
| Average Data | Jan | Feb | Mar | Apr | May | June |
| Rain (in) | 2.1/2.2 | 3.5/3.6 | 5.0/5.1 | 6.9/7.0 | 7.7/7.8 | 8.2/8.3 |
| Rain (mm) | 50/55 | 90/95 | 130/135 | 175/180 | 195/200 | 210/215 |
| Average Data | July | Aug | Sep | Oct | Nov | Dec |
| Rain (in) | 5.2/5.3 | 4.5/4.6 | 3.2/3.3 | 2.8/2.9 | 2.5/2.6 | 1.7/1.8 |
| Rain (mm) | 130/135 | 115/120 | 80/85 | 70/75 | 60/65 | 40/45 |

Travelers' Voices on Jiujiang Climate