Weekly Weather Summary
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September 13, 2021 - September 19, 2021Max. Rainfall AmountMax. Temperature
Thailand
The monsoon trough lay across the lower northern, central and northeastern parts during the beginning and the middle of the week. It lay toward an active low pressure cell which downgraded from the tropical storm “CONSON (2113)” over central Vietnam on the first day of the week. In addition, the southwest monsoon prevailed over the Andaman Sea, southern part and the Gulf of Thailand throughout the week. Moreover, the active low pressure cell covered the coast of central Vietnam on the last day of the week. These conditions caused plentiful rainfall over upper Thailand almost the week with flooding in many areas while southern part received abundant rainfall almost the week particularly along the west coast.    
Northern Part
Fairly widespread rain during the beginning and the middle of the week then decreased to isolated to scattered rain. Heavy rainfall occurred in some areas throughout the week and very heavy rainfall in some areas on 15-16 Sep. Flooding continued from the previous week in Phitsanulok, Pichit, Kamphaeng Phet and Phetchabun provinces. Flash flood occurred in Tak and Sukhothai provinces on 16 Sep. 111.0 mm at Si Samrong Agromet. Stn. Sukhothai on 16 Sep. 
Northeastern Part
Fairly widespread rain except for scattered rain on 16-18 Sep. Heavy to very heavy rainfall occurred in some areas throughout the week. Flooding continued from the previous week in Nakhon Ratchasima and Loei provinces. Flash flood occurred in Chaiyaphum province on 18 Sep. 187.2 mm at Tha Bo Nong Khai on 15 Sep. 
Central Part
Isolated to scattered rain except for fairly widespread rain on 15, 16 and 19 Sep. Heavy rainfall occurred in some areas almost the week and very heavy rainfall in some areas on 14 and 19 Sep. Flooding occurred in Phra Nakhon Si Ayutthaya province on 13–16 Sep. 126.5 mm at Mae Nam Phachi Wildlife Sanctuary Ratchaburi on 19 Sep. 
Eastern Part
Fairly widespread rain except for isolated to scattered rain on 17-18 Sep. Heavy rainfall occurred in some areas throughout the week and very heavy rainfall in some areas during the first half of the week and on the last day of the week. Flooding continued from the previous week in Prachin Buri and Nakhon Nayok provinces. Flash flood occurred in Chantaburi province on 18 Sep. 234.4 mm at Khlong Yai Trat on 13 Sep. 
Southern Part (East Coast)
Isolated to scattered rain except for fairly widespread rain on 14, 15 and 19 Sep. Heavy rainfall occurred in some areas from Surat Thani province southward almost the week. 78.0 mm at Khiri Ratthanikhom Surat Thani on 18 Sep. 
Southern Part (West Coast)
Fairly widespread rain except for isolated rain on 16-17 Sep. Heavy rainfall occurred in some areas during the beginning and the end of the week and very heavy rainfall in some areas on 18 Sep. Gusty wind occurred in some areas of Trang province on 19 Sep. 90.5 mm at Takua Thung Phang-nga on 18 Sep. 
Metropolitan
Fairly widespread rain except for scattered rain on 13, 17 and 18 Sep. Heavy rainfall occurred in some areas on 15-16 Sep. and very heavy rainfall in some areas on the last day of the week. Flooding continued from the previous week in Samut Prakan province on 13-15 Sep. 102.2 mm at Wat Dan School Khet Yannawa on 19 Sep. (38.2 mm at Bang Phli Samut Prakan on 19 Sep.)  
Weekly total Rainfall and Weekly mean minimum temperature Map
Issued Date September 20, 2021