Hanoi weather

Our guide to the weather in Hanoi during September


Average high


UV Index


Monthly rainfall


Sea temperature

Hanoi is a vibrant city full of culture and history, offering something for everyone. September is a great time to visit, with pleasant temperatures and plenty of activities to enjoy. We've looked at the most up-to-date weather data for Hanoi, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Hanoi weather in September.

How hot is it in Hanoi during September?

Expect heat in Hanoi during September. The temperature hits about 32℃ during the day, falling away to a balmy 25℃ at night. Of course, the high humidity will make it feel even hotter. The UV index will be high at this time of year, so protection against skin and eye damage is needed. Try to limit exposure between 10am and 4pm. Apply broad spectrum SPF 30+ sunscreen every few hours, even if it's cloudy, or more frequently after sweating or swimming, and wear UV-blocking sunglasses too, and bear in mind that bright surfaces, such as sand and water increase UV exposure.

Does it rain in Hanoi during September?

On average, there will be 11 rainy days during the month, amounting to 198.0mm in total. That's a significant amount of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. Due to the high temperature and humidity, you might expect lots of thunderstorms, however they're actually fairly infrequent at this time of year. On average, September will see just 6 days that produce a storm.

Is it windy in Hanoi during September?

You're unlikely to experience any strong winds. Expect a light breeze that picks up slightly at times in September. The high humidity and warm temperature will make the breeze feel warm, so any cooling effect will be limted.

How warm is the sea in Hanoi during September?

The water around Hanoi reaches a very pleasant 28℃ during September. This is very warm, and will feel bath-like. People who normally feel the cold will find this temperature perfectly acceptable. The hot air temperature and relatively high humidity will mean that you will feel comfortably warm when coming out of the water.

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Hanoi Blog posts

From the UK's most popular travel bloggers


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Last updated on 6th October 2023, this review post of the Wecozy Hanoi Railway Side in the Old Quarter includes affiliate links. If you're planning a visit to Hanoi and need recommendations on where to stay in the Old Quarter for either a short break or an extended stay, this comprehensive review of the Wecozy Hanoi Railway Side apartments will provide you with all the inspiration you need. Read on to discover more about this accommodation option in the heart of Hanoi....


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27th September 2023 by I'm just a girl 16

Last updated on 26th September 2023, this comprehensive guide to Beer Street in Hanoi provides all the information you need for an unforgettable night out in the lively Hanoi Old Quarter. If you're searching for the best nightlife experience in this vibrant area, look no further than Ta Hien Beer Street. Discover everything you need to know about immersing yourself in the energetic atmosphere of Beer Street in Hanoi. While Vietnam may not be widely known for its beer culture, Beer Street in...


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26th September 2023 by I'm just a girl 16

Last Updated on 25th September 2023, this article on the top bahn mi spots in Hanoi includes affiliate links. If you're heading to Hanoi and looking for the ultimate guide to the finest bahn mi eateries, then this is for you! Discover the 12 best bahn mi in Hanoi, Vietnam, as we take you on a culinary journey through the city. From traditional street stalls to hidden gems, we've got you covered. So, get ready to indulge in the mouthwatering flavors of Hanoi's iconic bahn mi sandwiches....

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