The low pressure trough will lie across central, lower portion of northeastern and eastern regions of Thailand in September. Abundant rainfall and floods are expected in some areas. During October to November period, slight rain will remain in upper Thailand as low pressure trough move southward to lie across southern Thailand and high pressure areas from China will occasionally extend its ridge to cover upper Thailand. Cool weather will be in north and
northeast regions with cold in the mountainous areas especially in November.
Northeast monsoon will prevail, bringing further heavy rain to southern Thailand. However, rainfall amounts are likely below average in several areas. Generally speaking, in upper Thailand the amount of rainfall will be slightly above normal and the average temperature will be slightly below normal. For southern Thailand, the amount of rainfall and the average temperature will be near normal.