What is the weather like in Hanoi in September?

Expect temperatures between 24°C and 30°C with 55% average rain probability and about 8 hours of sunshine daily.

What is the weather like in Hanoi in September?

Hanoi in September scores 54/100 based on 30 years of climate data. Good option with minor considerations.

Who should visit Hanoi in September?

September in Hanoi is ideal for: Business travelers.

Hanoi Weather in September | 30-Year Forecast

Avg High

30°C

Hottest around day 4

Avg Low

24°C

Coolest around day 30

Rainy Days

30days

55% avg rain chance

Sunshine

8hrs/day

Autumn season

Essential Travel Info for Hanoi

🗓️ Best Time to Visit 📖 Travel Guide 🍴 Food Guide

Currency

VND

₫ Vietnamese đồng

Language

Vietnamese

Driving

Right side

Connect

Most regular restaurants and cafés have ...

Safety

High Safety

GPI: 1.786

Travel Intelligence

Exclusive flight analytics & health data for Hanoi

Smart Flight Estimator

Airport-to-Airport Logistics

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Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Well Connected

60/ 100

Traffic Index

Popular destination

Peak Daily Arrivals

slots per day

Peak

Jul

Low

Oct

Monthly Traffic Distribution

274

Jan

289

Feb

278

Mar

271

Apr

272

May

286

Jun

296

Jul

286

Aug

246

Sep

159

Oct

237

Nov

265

Dec

Traffic Level

Low Season

Key Connections

Ho Chi Minh City Tan Son Nhat (SGN)

Da Nang (DAD)

Duong Dong Phu Quoc (PQC)

Seoul Incheon (ICN)

Taipei Taiwan Taoyuan (TPE)

Health & Safety Advisory

CDC travel health recommendations

10 Recommendations

COVID-19

All eligible travelers should be up to date with their COVID-19 vaccines. Please seeYour COVID-19 Vaccinationfor more information.

Chikungunya

All travelers should take steps to prevent mosquito bites. Chikungunya vaccination is generally not recommended. Travelers who wish to consider vaccination can visit “What to consider before traveling” on thechikungunya vaccinespage to learn more.

Hepatitis A

Recommended for unvaccinated travelers one year old or older going to Vietnam.Infants 6 to 11 months old should also be vaccinated against Hepatitis A. The dose does not count toward the routine 2-dose series.Travelers allergic to a vaccine component should receive a single dose of immune globulin, which provides effective protection for up to 2 months depending on dosage given.Unvaccinated travelers who are over 40 years old, are immunocompromised, or have chronic medical conditions planning to depart to a risk area in less than 2 weeks should get the initial dose of vaccine and at the same appointment receive immune globulin.

Hepatitis B

Recommended for unvaccinated travelers of all ages traveling to Vietnam.

Japanese Encephalitis

Recommended for travelers whoAre moving to an area with Japanese encephalitis to liveSpend long periods of time, such as a month or more, in areas with Japanese encephalitisFrequently travel to areas with Japanese encephalitisConsider vaccination for travelersSpending less than a month in areas with Japanese encephalitis but will be doing activities that increase risk of infection, such as visiting rural areas, hiking or camping, or staying in places without air conditioning, screens, or bed netsGoing to areas with Japanese encephalitis who are uncertain of their activities or how long they will be thereNot recommended for travelers planning short-term travel to urban areas or travel to areas with no clear Japanese encephalitis season.

Malaria

CDC recommends that travelers going to certain areas of Vietnam take prescription medicine to prevent malaria. Depending on the medicine you take, you will need to start taking this medicine multiple days before your trip, as well as during and after your trip. Talk to your doctor about which malaria medication you should take.Transmission areasRural areas only; rare cases in the Mekong and Red River DeltasNone in the cities of Da Nang, Hai Phong, Hanoi, Ho Chi Minh City (Saigon), Nha Trang, and Quy NhonDrug resistanceChloroquine and mefloquineSpeciesP. vivax(55%)P. falciparum(44%)P. knowlesi,6P. malariae, andP. ovale(rare)Recommended chemoprophylaxisProvinces of Bình Dương, Bình Phước, Đắk Lắk, Đắk Nông, Gia Lai, Khánh Hòa, Kon Tum, Lâm Đồng, Ninh Thuận, Tây Ninh: Atovaquone-proguanil, doxycycline, tafenoquine2All other areas with malaria transmission (except Mekong and Red River Deltas): Atovaquone-proguanil, doxycycline, mefloquine, tafenoquine2Mekong and Red River Deltas: No chemoprophylaxis recommended (insect bite precautions and mosquito avoidance only)4Updated April 23, 2025See footnotes

+4 more

Source: CDC Travelers' Health

View Complete Health Guide

Is September a Good Time to Visit Hanoi?

👌Good option with minor considerations(54/100)

Short Answer

September isn't Hanoi's most comfortable season - 30°C and sticky 84% humidity will challenge most visitors. Consider air-conditioned tours and plan for afternoon breaks.

Decision Factors

Oppressive heat and humidity

30.4°C with 84% humidity - challenging conditions

Vaccinations required

Yellow Fever

Feels significantly hotter than 30.4°C

Heat index: 40°C due to 84% humidity

Poor air quality: Unhealthy

Unhealthy. Everyone should reduce outdoor activities.

Frequent rainfall expected

55% chance of rain - pack waterproofs

Health precautions needed

Be aware of: Leptospirosis, Melioidosis, Schistosomiasis

Good For

💼
Business travelers
Climate-controlled meetings unaffected by weather

Who Should Avoid

👨‍👩‍👧‍👦
Families with children
40°C heat index dangerous for children
👴
Elderly travelers
Heat index of 40°C poses health risks
🥾
Outdoor enthusiasts
55% rain probability disrupts outdoor activities
💑
Honeymoon couples
Wedding score only 70/100 - better months available

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Hanoi in September averages 30°C with 55% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Hanoi in September

What are the temperatures in Hanoi in September?

Daytime highs average 30°C, nights drop to 24°C. Temperatures remain fairly consistent.

How many rainy days in Hanoi in September?

Expect around 30 days with measurable rainfall. Definitely pack rain gear.

What to wear in Hanoi in September?

Light, breathable fabrics. Don't forget sunglasses and a hat.

Is September peak season in Hanoi?

This is off-peak season. Expect lower prices and fewer crowds.

Hanoi Weather in September

Hanoi September Weather Calendar