Summer is around the edge and it comes together with Hanoi rainy season. During the summer from June to around October it rains almost every day. It comes like a flash for an hour or two and the sun comes out like there’s never any rain before. Visiting Vietnam in Hanoi rainy season can be a bit different. While rain in the summer is not too uncomfortable to interrupt your itinerary. You should always have some back up plan in case it rains too much or too heavily.