Based on hourly precipitation data from 6 National Weather Stations and 122 regional meteorological stations in Jiangmen from 2010 to 2021, the spatial and temporal distribution characteristics of precipitation during different periods of the flood season in Jiangmen were analyzed. The results are as follows: (1) The average annual precipitation in Jiangmen is higher in the south than in the north, with a stronger average annual rainfall intensity in the south. The average monthly rainfall distribution exhibits a "double peak" pattern, with the highest rainfall occurring in August, the second peak in May, and the least rainfall in December. (2) Short-duration precipitation events are the most frequent, while long-duration events contribute the most to total rainfall. (3) Short- and medium-duration precipitation predominantly affects the northern region, whereas long-duration precipitation primarily impacts the southwest and coastal areas. There is little variation in the frequency of long-duration rainfall during the post-flood period, but the contribution of rainfall from the southern region is greater. (4) Spatially, nearly 40% of the stations recorded peak average daily rainfall from morning to noon in both pre-flood and post-flood seasons. During the pre-flood season, the northwest region exhibits stronger convection in the afternoon to evening, while the southeast experiences more intense convection during the latter part of the night. In the post-flood season, nocturnal rainfall becomes more pronounced than in the pre-flood season, with the strongest rainfall occurring from midnight to morning.