Cold air is making its way into Northern Vietnam, particularly affecting Hanoi and several regions in the North with rain and cooler temperatures. According to the national meteorological center, this cold front will continue to spread tonight and into tomorrow morning, impacting the northern provinces and areas from Thanh Hoa to Hue.

As of the evening of October 4, the cold air has already begun to influence the northeastern mountainous and midland regions. Rain showers and thunderstorms have been reported across the northern areas, with some locations experiencing heavy rainfall. The forecast indicates that the cold air will further affect other parts of the northeastern region, followed by the northwestern areas and the region from Thanh Hoa to Hue.

From the evening of October 4, temperatures in the northeastern region and Thanh Hoa will drop, with mountainous areas experiencing colder conditions. The lowest temperatures during this cold spell are expected to range from 19-22 degrees Celsius in the lowlands of the North and Thanh Hoa, while mountainous areas may see temperatures drop to 14-17 degrees Celsius.

In Hanoi, rain is expected from the evening of October 4 through the morning of October 5, with moderate rainfall and possible thunderstorms, particularly heavy in some areas. Following this, the weather will turn colder. The forecast for October 5 indicates that the capital will experience cloudy conditions with rain and thunderstorms, with temperatures ranging from 21-23 degrees Celsius at night to 24-26 degrees Celsius during the day.

The weather forecast for various regions across the country on October 5 is as follows:

• Northwest Region: Cloudy with rain and thunderstorms, temperatures between 20-23 degrees Celsius at night and 24-27 degrees Celsius during the day.
• Northeast Region: Similar conditions with temperatures ranging from 20-23 degrees Celsius at night and 24-27 degrees Celsius during the day.
• Thanh Hoa to Hue: Cloudy with rain and thunderstorms, temperatures between 23-26 degrees Celsius at night and 27-30 degrees Celsius during the day.
• Central Coast: Cloudy with occasional rain, temperatures between 24-27 degrees Celsius at night and 30-33 degrees Celsius during the day.
• Central Highlands: Cloudy with scattered rain, temperatures between 21-24 degrees Celsius at night and 29-32 degrees Celsius during the day.
• Southern Region: Cloudy with scattered rain, especially in the afternoon and evening, temperatures between 24-27 degrees Celsius at night and 31-34 degrees Celsius during the day.

In Ho Chi Minh City, the weather will also feature cloud cover with scattered rain and thunderstorms, particularly in the afternoon and evening, with temperatures ranging from 24-26 degrees Celsius at night and 32-34 degrees Celsius during the day.

This cold air mass is expected to bring significant rainfall over the coming days, with some areas potentially receiving very heavy rain, particularly from October 6 to October 7 in regions from Quang Tri to Da Nang and eastern Quang Ngai.