Many roads and houses in Hue City and Quang Ngai province are flooded at the depth of one metre.
Landslide in the Hai Van Tunnel delayed two North-South trains for one hour.
Nearly 150 households in Quang Ngai province's Tay Tra district are at risk of being hit by landslides.
And it is forecast that heavy rains will keep battering these provinces for several more days, according to the National Centre for Hydro-meteorological Forecasting.
The centre also predicted that water levels in rivers from Nghe An to Ninh Thuan provinces will continue to rise to higher than the Alert Level 2.
An alert has also been sent out to provinces at risk of being hit by flash floods and landslides.
According to the Southern Hydro-Meotorolical Forecasting Centre, flood tides in Sai Gon and Dong Nai rivers will reach 1.42 metres. The highest level will be between 4 and 7 am between Oct. 26 and 31.
The southern provinces and Central Highlands are also expected to have more rains, said the centre.