January 20° · ☂ 8 ★ February22° · ☂ 8 ★ March24° · ☂ 10 April 28° · ☂ 10 May 32° · ☂ 17 June 35° · ☂ 18 July 34° · ☂ 21 August 33° · ☂ 23 September 32° · ☂ 19 October 30° · ☂ 12 November 27° · ☂ 7 ★ December22° · ☂ 7 Hanoi in September:seriously hot Hanoi, Vietnam · Records from 2006 to 2025. Not a forecast. Rain not yet station-calibrated Temperature partly station-corrected
Mean high 32° Hottest day 37.4° (2021)
Mean low 25° Coldest night 20.7° (2006)
Rain days 19 days 9-26 by year
Rainfall 263mm Daylight 12.6 → 12.0 h
Hanoi's 12 months i Best: February, March and December (rain uncalibrated)
1 2 3 4 5 6 7 8 9 10 11 12
Trip types Sightseeing on foot Poorhot, frequent rain, muggy and storm risk
Humidity 83% 29 muggy days
Clear days 3 days 17 overcast days
Mean wind 7 km/h Rarely windy
Sunrise / sunset (15th) 05:43 / 18:00 Daylight 12.6 → 12.0 h
Hanoi in September Rain continues but eases toward the end of the month. September 2 is National Day, and in some years the holiday runs longer. The Mid-Autumn Festival on the 15th of the eighth lunar month falls in September or early October, filling the Old Quarter with mooncakes and lanterns.
Days averaged 32°C and nights 25°C. Midday was for air conditioning, a cold drink or a long lunch out of the sun. Rain came so often (19 days on average) that dry stretches were short and worth using. A visitor in 2006 met 9 rain days; one in 2020 met 26. The average of 19 hid that gap.
24 days past 30°C made it a month for early starts and a long lunch indoors.
Typhoons i 4 of the last 20 years had a tropical storm pass within 300 km this month.
Yagi (2024), 16 km away typhoon strength Nesat (2011), 47 km away tropical storm Kalmaegi (2014), 100 km away typhoon strength 1 2 3 4 5 3 6 11 7 8 8 4 9 6 10 1 11 12
Date by date i Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Wednesday 1 rain in 15 of 20 yrs 15/20 33° 26° September 2 Thursday 2 rain in 15 of 20 yrs 15/20 33° 26° September 3 Friday 3 rain in 13 of 20 yrs 13/20 33° 26° September 4 Saturday 4 rain in 16 of 20 yrs 16/20 33° 26° 1-4 rain on 74% of days 33° 26°
September 5 Sunday 5 rain in 14 of 20 yrs 14/20 33° 26° September 6 Monday 6 rain in 13 of 20 yrs 13/20 33° 26° September 7 Tuesday 7 rain in 13 of 20 yrs 13/20 32° 26° September 8 Wednesday 8 rain in 16 of 20 yrs 16/20 32° 26° September 9 Thursday 9 rain in 18 of 20 yrs 18/20 32° 26° September 10 Friday 10 rain in 14 of 20 yrs 14/20 32° 25° September 11 Saturday 11 rain in 14 of 20 yrs 14/20 32° 25° 5-11 rain on 73% of days 32° 26°
September 12 Sunday 12 rain in 13 of 20 yrs 13/20 32° 25° September 13 Monday 13 rain in 15 of 20 yrs 15/20 32° 25° September 14 Tuesday 14 rain in 10 of 20 yrs 10/20 32° 25° September 15 Wednesday 15 rain in 14 of 20 yrs 14/20 32° 25° September 16 Thursday 16 rain in 12 of 20 yrs 12/20 32° 25° September 17 Friday 17 rain in 13 of 20 yrs 13/20 32° 25° September 18 Saturday 18 rain in 12 of 20 yrs 12/20 33° 25° 12-18 rain on 64% of days 32° 25°
September 19 Sunday 19 rain in 11 of 20 yrs 11/20 33° 25° September 20 Monday 20 rain in 12 of 20 yrs 12/20 32° 25° September 21 Tuesday 21 rain in 9 of 20 yrs 9/20 32° 25° September 22 Wednesday 22 rain in 9 of 20 yrs 9/20 32° 25° September 23 Thursday 23 rain in 9 of 20 yrs 9/20 32° 25° September 24 Friday 24 rain in 10 of 20 yrs 10/20 32° 24° September 25 Saturday 25 rain in 14 of 20 yrs 14/20 31° 25° 19-25 rain on 53% of days 32° 25°
September 26 Sunday 26 rain in 15 of 20 yrs 15/20 31° 25° September 27 Monday 27 rain in 13 of 20 yrs 13/20 31° 25° September 28 Tuesday 28 rain in 12 of 20 yrs 12/20 32° 25° September 29 Wednesday 29 rain in 8 of 20 yrs 8/20 32° 25° September 30 Thursday 30 rain in 14 of 20 yrs 14/20 31° 24°
26-30 rain on 62% of days 32° 25°
Rain was common on almost every date this month, so the shades compare dates within this month.
1-4 rain on 74% of days 33° 26° 5-11 rain on 73% of days 32° 26° 12-18 rain on 64% of days 32° 25° 19-25 rain on 53% of days 32° 25° 26-30 rain on 62% of days 32° 25°
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
September 1 Friday 1 rain in 15 of 20 yrs 15/20 33° 26° September 2 Saturday 2 rain in 15 of 20 yrs 15/20 33° 26° 1-2 rain on 75% of days 33° 26°
September 3 Sunday 3 rain in 13 of 20 yrs 13/20 33° 26° September 4 Monday 4 rain in 16 of 20 yrs 16/20 33° 26° September 5 Tuesday 5 rain in 14 of 20 yrs 14/20 33° 26° September 6 Wednesday 6 rain in 13 of 20 yrs 13/20 33° 26° September 7 Thursday 7 rain in 13 of 20 yrs 13/20 32° 26° September 8 Friday 8 rain in 16 of 20 yrs 16/20 32° 26° September 9 Saturday 9 rain in 18 of 20 yrs 18/20 32° 26° 3-9 rain on 74% of days 33° 26°
September 10 Sunday 10 rain in 14 of 20 yrs 14/20 32° 25° September 11 Monday 11 rain in 14 of 20 yrs 14/20 32° 25° September 12 Tuesday 12 rain in 13 of 20 yrs 13/20 32° 25° September 13 Wednesday 13 rain in 15 of 20 yrs 15/20 32° 25° September 14 Thursday 14 rain in 10 of 20 yrs 10/20 32° 25° September 15 Friday 15 rain in 14 of 20 yrs 14/20 32° 25° September 16 Saturday 16 rain in 12 of 20 yrs 12/20 32° 25° 10-16 rain on 66% of days 32° 25°
September 17 Sunday 17 rain in 13 of 20 yrs 13/20 32° 25° September 18 Monday 18 rain in 12 of 20 yrs 12/20 33° 25° September 19 Tuesday 19 rain in 11 of 20 yrs 11/20 33° 25° September 20 Wednesday 20 rain in 12 of 20 yrs 12/20 32° 25° September 21 Thursday 21 rain in 9 of 20 yrs 9/20 32° 25° September 22 Friday 22 rain in 9 of 20 yrs 9/20 32° 25° September 23 Saturday 23 rain in 9 of 20 yrs 9/20 32° 25° 17-23 rain on 54% of days 32° 25°
September 24 Sunday 24 rain in 10 of 20 yrs 10/20 32° 24° September 25 Monday 25 rain in 14 of 20 yrs 14/20 31° 25° September 26 Tuesday 26 rain in 15 of 20 yrs 15/20 31° 25° September 27 Wednesday 27 rain in 13 of 20 yrs 13/20 31° 25° September 28 Thursday 28 rain in 12 of 20 yrs 12/20 32° 25° September 29 Friday 29 rain in 8 of 20 yrs 8/20 32° 25° September 30 Saturday 30 rain in 14 of 20 yrs 14/20 31° 24° 24-30 rain on 61% of days 31° 25°
Rain was common on almost every date this month, so the shades compare dates within this month.
1-2 rain on 75% of days 33° 26° 3-9 rain on 74% of days 33° 26° 10-16 rain on 66% of days 32° 25° 17-23 rain on 54% of days 32° 25° 24-30 rain on 61% of days 31° 25°
Tap another date to change
2006 14mm
2007 22mm
2008 1mm
2009 none
2010 9mm
2011 10mm
2012 2mm
2013 1mm
2014 6mm
2015 13mm
2016 5mm
2017 3mm
2018 none
2019 35mm
2020 7mm
2021 9mm
2022 12mm
2023 3mm
2024 33mm
2025 4mm
Holidays in September (2027) September 2 to September 5 National Day break, proposed 4-day plan *September 6 Labor Day * Provisional: not yet officially announced.
1 Local public holiday or break (busier, pricier)1 US holidays (flights fill up)
Your trip dates, the past 20 years Trip dates September 1 (Wed) 2 (Thu) 3 (Fri) 4 (Sat) 5 (Sun) 6 (Mon) 7 (Tue) 8 (Wed) 9 (Thu) 10 (Fri) 11 (Sat) 12 (Sun) 13 (Mon) 14 (Tue) 15 (Wed) 16 (Thu) 17 (Fri) 18 (Sat) 19 (Sun) 20 (Mon) 21 (Tue) 22 (Wed) 23 (Thu) 24 (Fri) 25 (Sat) 26 (Sun) 27 (Mon) 28 (Tue) 29 (Wed) 30 (Thu) ~ September 1 (Wed) 2 (Thu) 3 (Fri) 4 (Sat) 5 (Sun) 6 (Mon) 7 (Tue) 8 (Wed) 9 (Thu) 10 (Fri) 11 (Sat) 12 (Sun) 13 (Mon) 14 (Tue) 15 (Wed) 16 (Thu) 17 (Fri) 18 (Sat) 19 (Sun) 20 (Mon) 21 (Tue) 22 (Wed) 23 (Thu) 24 (Fri) 25 (Sat) 26 (Sun) 27 (Mon) 28 (Tue) 29 (Wed) 30 (Thu) 1-7 8-14 15-21 22-end Whole month
You can also click two dates on the axis. Hover a cell to see that day's rain. By year Driest trips first
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Trip rain days Month rain days Tap a date to start, tap another to end. Each cell is that date in one year. '06 '07 '08 '09 '10 '11 '12 '13 '14 '15 '16 '17 '18 '19 '20 '21 '22 '23 '24 '25
of 20 1 Wed Pick September 1
15 2 Thu Pick September 2
15 3 Fri Pick September 3
13 4 Sat Pick September 4
16 5 Sun Pick September 5
14 6 Mon Pick September 6
13 7 Tue Pick September 7
13 8 Wed Pick September 8
16 9 Thu Pick September 9
18 10 Fri Pick September 10
14 11 Sat Pick September 11
14 12 Sun Pick September 12
13 13 Mon Pick September 13
15 14 Tue Pick September 14
10 15 Wed Pick September 15
14 16 Thu Pick September 16
12 17 Fri Pick September 17
13 18 Sat Pick September 18
12 19 Sun Pick September 19
11 20 Mon Pick September 20
12 21 Tue Pick September 21
9 22 Wed Pick September 22
9 23 Thu Pick September 23
9 24 Fri Pick September 24
10 25 Sat Pick September 25
14 26 Sun Pick September 26
15 27 Mon Pick September 27
13 28 Tue Pick September 28
12 29 Wed Pick September 29
8 30 Thu Pick September 30
14 Dates outside your trip are dimmed.
One row per year, one cell per day. 2006 had 9 rain days, 2020 had 26.
Common questions Does it rain a lot in Hanoi in September? Over the past 20 years September averaged 19 rain days (1 mm or more) out of 30. Individual years ran from 9 in the driest to 26 in the wettest. Rain for this month is not yet station-calibrated and may be overcounted.
What should I wear in Hanoi in September? Days averaged 32°C and nights 25°C. Pack an umbrella, sandals that can get wet, T-shirts, sunscreen plus a hat, and insect repellent.
Is September a good time to visit Hanoi? On warmth and rain days alone, Hanoi's easiest months were February, March and December. September ranked 8 of 12.
Is Hanoi humid in September? Mean relative humidity was 83%, with about 29 muggy days (dew point of 20°C or more) in the month.
Previous month Hanoi in August Next month Hanoi in October Whole year Hanoi weather by month Where to go September By country Vietnam: all cities this month Compare Compare with Da Nang