Hanoi Weather in September
Hanoi in September sees very high daytime temperatures of 33°C (91°F) and nighttime lows of 25°C (77°F). As part of the rainy season, showers are frequent and often heavy. Budget around 247 mm (9.7 in) of rainfall for the month.
Rainfall in Hanoi in September
Hanoi is in the rainy season in September, with rain on around 14 days and an average of 247 mm (9.7 in). The rain this month falls heavily when it arrives. Late afternoons in particular can see strong showers, so waterproofs are worth keeping handy.
Temperature in Hanoi in September
In September, Hanoi sees very high temperatures, with highs of 33°C (91°F). Nights drop to around 25°C (77°F). Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. Nights stay warm at around 25°C (77°F), so light bedding and good ventilation are worth thinking about.
Sunshine in Hanoi in September
With about 162 hours of sunshine, the area enjoys a nice balance of sun and rainy moments, creating a pleasant environment.September in Hanoi has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Vietnam, check out our Hanoi's climate page.
Hanoi Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
33°C (91°F)
Chance of Rain
46%
Precipitation
247 mm (9.7 in)
Rainy days
14 days
Humidity
87%
Sunshine
162 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Hanoi typically stay consistent throughout September, with daily highs averaging around 33°C (91°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Hanoi in September
Browse day-by-day weather records for Hanoi spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Hanoi historical weather extremes in September
Based on 49 years of weather observations in Hanoi between 1976 and 2025, these are the recorded extremes.
- On September 4, 1989, temperatures climbed to 39°C (102°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 21°C (70°F), recorded on September 26, 1997.
- The lowest overnight temperature recorded in September was 17°C (63°F) (September 27, 1997).
Best Places in Vietnam in September
Find out more about the weather in Vietnam and which places have the best travel conditions in this month. See all of Vietnam in September →
perfect weather
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unpleasant
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What to Wear in Hanoi in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Hanoi in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Vietnam, check out our Hanoi's climate page.
Temperature Rainfall Sunshine Humidity
See the full Hanoi climate overview or explore weather in Vietnam.
