In September, the El Nino phenomenon continues to strengthen and operate at a very strong intensity. The hot low pressure in the West gradually weakens.
In the first 15 days of the month, the tropical convergence zone with its axis through the North - Central region and the North East Sea continues to operate. In the second half of the month, the southern branch of the subtropical high pressure tends to gradually strengthen and raise its axis to the North, affecting the South and South Central regions.
In the South, in the first half of the month, this area is affected by the southern edge of the tropical convergence zone, in the Southwest wind field with medium to strong intensity. In the second half of the month, subtropical high pressure dominates, causing the Southwest wind field to decrease to a weak to medium level.
The total rainfall in September in Ho Chi Minh City and southern provinces and cities is forecast to be approximately or lower than the multi-year average (MYA). The average monthly temperature is higher than the MYA, and some days may experience localized heat.
The Southern region needs to be wary of 1-2 heavy rains in the first week and mid-month. There is a possibility of 2-3 tropical cyclones appearing in the East Sea.
The average temperature in September is generally 1-2 degrees Celsius higher than the TBNN. The highest temperature is commonly 31-34 degrees Celsius, with days possibly reaching 35-36 degrees Celsius; the lowest temperature is commonly 25-28 degrees Celsius.
Total rainfall in September is generally at or below the TBNN. Rainfall is likely to be more clearly depleted in the central and northern areas of the city, about 5-25% lower than the TBNN.
Rain is forecast to concentrate more in the first week and mid-month week, with a common total number of rain days from 14-19 days.
