The tropical convergence zone with an axis through the Central region tends to gradually lift its axis to the North and is weak. Around September 22, strong activity resumed, connecting with Typhoon Ragasa in the sea east of the Philippines. Typhoon Ragasa is likely to move into the East Sea around the morning of September 23 and become the ninth typhoon of 2025.
The southwest monsoon will operate at medium intensity, from September 22 it will gradually strengthen and reach medium to strong intensity. Above, the northern branch of the subtropical high pressure with an axis over southern China will encroach on the West, weakening from September 23 to the East.
At the same time, the southern branch of the subtropical high pressure with an axis passing through the Southern region will also gently encroach to the West, from September 22, the subtropical high pressure will weaken, lower its axis to the South and retreat to the East.
Therefore, the weather in the South on September 21 and from September 26-27, the clouds will change, the days will be sunny, the afternoon and evening will have scattered showers and thunderstorms, some places will have moderate to heavy rain. Night with showers and thunderstorms in some places. The highest temperature is generally 31-34 degrees Celsius, the lowest temperature is 25-27 degrees Celsius.
From September 22-25 and from September 28-30, the clouds will change to cloudy, with intermittent sunshine during the day, with showers and thunderstorms in many places in the afternoon and evening, scattered moderate rain, and heavy rain in some places. Scattered showers and thunderstorms at night. The highest temperature is commonly 30-33 degrees Celsius, the lowest temperature is 24-26 degrees Celsius.
During thunderstorms, it is necessary to be on guard against tornadoes, lightning, hail and strong gusts of wind that can endanger people and property damage, and be on guard against localized heavy rain that can cause flooding on some roads in the central area of Ho Chi Minh City.
