Hanoi has a tropical monsoon climate, classified as Am in the Köppen system. The warmest month is June with an average high of 33°C, while the coldest month is January with lows dropping to 13°C. The annual temperature range of 20°C reflects moderate seasonal variation.
The driest month is December with only 7 rain days and 35mm of precipitation. For travellers, December through to the following month typically offers the best balance of warm temperatures and dry conditions. Average humidity ranges from 78% to 78% throughout the year.
Best Time to Visit Hanoi
Based on temperature and rainfall data, the best months to visit Hanoi are October, November, January. These months offer the most comfortable temperatures with relatively low rainfall, ideal for sightseeing and outdoor activities.
In June, Hanoi experiences average highs of 33°C (91°F) and lows of 26°C (79°F). Expect around 19 rainy days and 8 hours of sunshine per day, with humidity averaging 78%. The 7°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 9, so sun protection is advisable on clear days.
Hanoi typically sees 19 rainy days in June, with total precipitation of around 228mm. This is a notably wet period. A waterproof jacket or compact umbrella is essential, and it is worth building indoor alternatives into your daily itinerary for the inevitable rainy stretches. For context, the driest month in Hanoi typically sees 4-6 fewer rain days than June.
Pack lightweight, breathable clothing (linen or cotton), a wide-brim sun hat, SPF 50+ sunscreen, and a refillable water bottle for Hanoi in June. The 33°C daytime heat demands sun protection during midday hours, typically 11am to 4pm. A compact travel umbrella is also worth packing, as 19 rainy days means afternoon showers are a real possibility. Quick-dry synthetic fabrics are preferable to cotton in 78% humidity.
June is a reasonable time to visit Hanoi. Expect 19 rainy days, so pack a light rain layer for flexibility. Average temperatures of 33°C make outdoor exploration comfortable during the dry periods. With 8 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.
The average high temperature in Hanoi in June is 33°C (91°F), and the average low is 26°C (79°F). The mean daily temperature is approximately 30°C (85°F). The day-to-night range of 7°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Hanoi is generally April. April offers the most sunshine at 7 hours per day and only 11 rainy days. Average temperatures reach 29°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around April gives you the best chance of dry, bright weather.
June is shoulder or low season in Hanoi, meaning fewer tourists and generally lower prices than peak months. With 8 sunshine hours and 19 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In June, Hanoi suits a range of activities thanks to warm temperatures of 33°C. With frequent rain, indoor activities and covered attractions are a smart choice. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 8 hours of sunshine, parks and waterfront walks are particularly enjoyable.