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The rains, which are more likely to hit during late afternoons and nights, will spread to more localities from Saturday evening.
Hanoi may see average rainfall of between 40-80mm while the outlying Ba Vi District will experience highest rainfall of upto 60-90mm.
The downpours may cause flooding of 20-30 cm in some streets in the city centre.
The rainfall is forecasted to decrease from June 11 with scattered sunshine.
The northern region is seeing a cool summer this year. After some blazing hot days in April, most of May had rain with average rainfall 30-60 percent higher than previous years.
The rains have continued into early June.
