Monthly Weather Summary

In July 2024, the southwest monsoon prevailed over the Andaman Sea, Thailand and the Gulf of Thailand nearly the entire month and it was strengthened in the middle of the month. Additionally, the monsoon trough periodically lay across the northern and northeastern part of Thailand. It lay over the northern Thailand into the low-pressure cell covering the northeastern part in the middle of the month and lay into the low-pressure cell covering the upper Laos and upper Vietnam for a few days and it shifted northward to lie over upper northern and upper Laos at the end of the month. Moreover, the tropical storm “PRAPIROON, (2404)” in the upper South China Sea moved pass the Hainan Island entering the Gulf of Tonkin and made landfall at Quang Ninh, upper Vietnam on July 23. Later on, it became a tropical depression and covered upper Vietnam as an active low-pressure cell. Due to these conditions, there was plentiful rainfall in the upper Thailand, with intermittent of heavy to extremely heavy rainfall, particularly in the middle and end of the month, there was heavy to extremely heavy rainfall in the northern, northeastern, and lower coastal areas of the eastern parts inducing flooding in several areas. In southern part, there were rainfall almost the whole month especially in the middle of the month when the southwest monsoon was strengthened. The average total rainfall overall Thailand in this month was 21% higher than normal. The average temperature of Thailand was 0.3 ^oC warmer than normal. Monthly rainfall was above normal in almost parts i.e. northern part 30.9 mm (16%), northeastern part 35.3 mm (15%), central part 38.9 mm (24%), eastern part 155.2 mm (54%) and southern part (east coast) 20.9 mm (18%) with inversely below normal in the southern part (west coast) 6.3 mm (2%). For more details were as follow.