According to the National Center for Hydro-Meteorological Forecasting, the cold air mass is continuing to move south.

The meteorological agency said that tonight, October 22, cold air will affect the mountainous areas of the North, then affect other places in the Northeast, North Central, some places in the Northwest and North Central.

From October 23, the Northern region, Thanh Hoa and Nghe An will have cool days and cold nights and mornings; the mountainous regions of the North will have cold nights and mornings.

Despite being affected by the strengthening cold air, according to AccuWeather's forecast, on October 23, Hanoi's air quality is still at a harmful level with an air quality index (AQI) of around 100 (the good threshold is 0-50).

With this air quality index, sensitive people are advised to avoid outdoor activities.

Weather forecast for October 23, regions across the country:

Hanoi: Cloudy, scattered showers and thunderstorms at night, sunny in the afternoon. Northeast wind level 3. Thunderstorms are likely to cause tornadoes, lightning and strong gusts of wind.

Lowest temperature 22-25 degrees Celsius; highest temperature 28-30 degrees Celsius.

Northwest : Cloudy, scattered showers and thunderstorms at night, sunny during the day. Light wind. Thunderstorms may cause tornadoes, lightning and strong gusts of wind.

Lowest temperature 21-24 degrees, some places below 20 degrees Celsius; highest temperature 27-30 degrees Celsius.

Northeast: Cloudy, scattered showers and thunderstorms at night, sunny in the afternoon. Northeast wind level 3, coastal areas level 4-5. Thunderstorms are likely to cause tornadoes, lightning and strong gusts of wind.

Lowest temperature 21-24 degrees Celsius, mountainous areas below 21 degrees Celsius; highest temperature 27-30 degrees Celsius.

Thanh Hoa - Thua Thien Hue: Cloudy, moderate rain, heavy rain and scattered thunderstorms at night and in the morning, locally very heavy rain. North to Northwest wind level 2-3. In thunderstorms, there is a possibility of tornadoes, lightning and strong gusts of wind.

Lowest temperature 22-25 degrees Celsius; highest temperature 26-29 degrees Celsius.

Da Nang to Binh Thuan: Cloudy, rain, locally very heavy rain. Northeast to north wind level 2-3. Thunderstorms with possibility of tornadoes, lightning and strong gusts of wind.

Lowest temperature 22-25 degrees Celsius; highest temperature 28-31 degrees Celsius.

Central Highlands: Cloudy, rain at night, moderate rain and scattered thunderstorms, locally heavy to very heavy rain; showers and thunderstorms in some places during the day. Light wind. During thunderstorms, there is a possibility of tornadoes, lightning and strong gusts of wind.

Lowest temperature 19-22 degrees Celsius; highest temperature 27-30 degrees Celsius.

Southern region: Cloudy, scattered showers and thunderstorms during the day, scattered showers and thunderstorms in the evening. Light wind. Thunderstorms may cause tornadoes, lightning and strong gusts of wind.

Lowest temperature 23-26 degrees Celsius; highest temperature 30-33 degrees Celsius.