The weather agency said real-feel outdoor temperatures may be 2-4 degrees Celsius higher than forecast, and could rise further in areas with heat-retaining surfaces such as concrete and asphalt.

On June 19, areas from Ha Tinh to Da Nang and the eastern parts of provinces from Quang Ngai to Dak Lak are forecast to experience severe heat, with daytime highs generally ranging from 36-38 degrees Celsius and exceeding 38 degrees in some places.

The Red River Delta, southern Phu Tho, Thanh Hoa and Nghe An will also see hot weather, with temperatures of 35-37 degrees Celsius. The heatwave is likely to persist in central regions in the coming days.

From June 21, it is expected to expand to the northern midland region.

The weather agency warned that prolonged heat and low humidity could heighten fire risks in residential areas due to increased electricity demand, while also raising the risk of forest fires.

Prolonged exposure to extreme heat may also lead to dehydration and other heat-related health risks.

Northern Vietnam braces for widespread heatwave after rare June cold spell

VOV.VN - Temperatures are expected to climb sharply across the northern and central regions of Vietnam from June 13-14, following a rare mid-June cold spell that temporarily brought cooler conditions to the region.

Northern Vietnam braces for widespread heavy rain after intense heatwave

VOV.VN - After days of scorching temperatures exceeding 38-40°C, the northern and north-central regions of Vietnam are now facing a widespread heavy rain event, with meteorologists warning of possible flashfloods, landslides and severe urban flooding in several provinces.