Haiphong weather in September

In September, Haiphong sees average daytime highs of 30°C and overnight lows near 26°C, with 290 mm of rain across 20 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 25% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Haiphong's 5th-clearest and 12th-windiest month. For the whole year in context, see Haiphong's year-round climate.

Daytime high
30°
4th warmest
Overnight low
26°
9th coldest
Rainfall
290 mm
20 wet days
Daylight
12 h 06 min
5:44 AM – 5:51 PM
Cloud cover
68%
5th clearest
Wind
11 km/h
12th windiest
Solar energy
4.5 kWh/m²
Travel score
3.8
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical September day in Haiphong reaches about 30°C in the afternoon and slips back to 26°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 32°C. Set against its neighbours, September runs about 1°C cooler than August and about 2°C warmer than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13027
23027
33027
43027
53027
63027
73027
83027
93026
103026
113026
123026
133026
143026
153026
163026
173026
183026
193026
203026
213026
223026
233026
243026
253026
263026
273026
282926
292925
302925

How September really feels in Haiphong

Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Haiphong weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan19° / 16°37710.96.3
Feb20° / 17°225.511.36.5
Mar22° / 19°397.611.96.7
Apr26° / 23°578.412.56.7
May29° / 26°20716.9134.5
Jun31° / 28°21418.413.23.3
Jul31° / 28°28120.113.13.2
Aug31° / 27°38124.412.73.0
Sep30° / 26°2902012.13.8
Oct28° / 24°13312.411.55.9
Nov25° / 21°608.2117.2
Dec21° / 17°376.510.86.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 62%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12575
22575
32575
42575
52674
62674
72872
82971
92971
103169
113169
123268
133466
143565
153664
163862
174060
184060
194258
204456
214555
224654
234753
244852
254951
265149
275149
285248
295248
305446

Chance of precipitation in September

Any precipitation

Haiphong gets around 290 mm of rain over 20 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 66% and peaks near 82% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
182
282
382
481
581
680
779
878
977
1076
1174
1272
1371
1469
1567
1665
1764
1862
1960
2059
2157
2256
2355
2454
2553
2652
2751
2850
2950
3049

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the miserable band about 74% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
100595
200694
300694
401792
501891
611890
711989
8121087
9121186
10121285
11131383
12131482
13141580
14141679
15151777
16161875
17162073
18172171
19172369
20282466
21292663
22292762
232102860
242113057
252113156
262123254
272133352
283143350
293143448
303153546

Wind in September

Winds average 11 km/h in September, the calmest month.

Across September, daily wind ranges from about 10 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over September. Sunrise moves from 5:40 AM to 5:48 AM, and sunset from 6:06 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:406:06
212.45:416:05
312.45:416:04
412.45:416:03
512.35:416:02
612.35:426:01
712.35:426:00
812.35:425:59
912.35:425:58
1012.25:435:57
1112.25:435:56
1212.25:435:55
1312.25:435:54
1412.25:445:53
1512.15:445:52
1612.15:445:51
1712.15:445:50
1812.15:455:49
1912.15:455:48
2012.05:455:47
2112.05:455:46
2212.05:465:45
2312.05:465:44
2412.05:465:43
2511.95:465:42
2611.95:475:41
2711.95:475:40
2811.95:475:39
2911.95:475:38
3011.85:485:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.5 kWh/m².

For context, solar energy here swings from a low near 2.54 kWh/m² to a high of 5.22 kWh/m² in May across the year — September's 4.5 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.4Bright
64.4Bright
74.4Bright
84.4Bright
94.4Bright
104.4Bright
114.5Bright
124.5Bright
134.5Bright
144.5Bright
154.5Bright
164.5Bright
174.5Bright
184.5Bright
194.6Bright
204.6Bright
214.6Bright
224.6Bright
234.6Bright
244.6Bright
254.6Bright
264.6Bright
274.6Bright
284.6Bright
294.6Bright
304.6Bright
Planning a trip in September

Hazard calendar for Haiphong

In seasonPeak

In September, Haiphong sits inside its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.

Haiphong sits in the Pacific typhoon belt; the season peaks July–October.

Haiphong's monsoon runs May–September, when most of the year's rain falls.

Pacific typhoon
Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Haiphong?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.8
Sightseeing
9th-best month of the year
5.2
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Haiphong.

What to pack for Haiphong in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Haiphong sees daytime highs around 30°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

Sea temperature near Haiphong in September

The nearest coast averages about 30°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 27 km away) is warmest in August at about 30°C and coldest in February near 20°C.

It's comfortable for a long swim from Feb 24 to Feb 2 — about 11.3 months when the water holds above 20°C.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan20Refreshing
Feb20Cool
Mar21Refreshing
Apr23Refreshing
May27Warm
Jun29Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct28Tropical
Nov26Warm
Dec23Refreshing

UV index in Haiphong in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Haiphong peaks around July 12 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 6 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighJul 12UV 12Dec 17UV 6
UV index (midday)Level
Jan7High
Feb8Very high
Mar8Very high
Apr8Very high
May10Very high
Jun11Extreme
Jul12Extreme
Aug7Very high
Sep8Very high
Oct9Very high
Nov7High
Dec6High

Air quality in Haiphong in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Haiphong is worst in December — around 92 µg/m³ PM2.5 (unhealthy), about 2.6× the cleanest month (July, 35 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyDec 2192 µg/m³Jul 1335 µg/m³
PM2.5 (µg/m³)Level
Jan90Unhealthy
Feb80Unhealthy
Mar76Unhealthy
Apr66Unhealthy
May49Poor
Jun37Poor
Jul35Moderate
Aug40Poor
Sep59Unhealthy
Oct74Unhealthy
Nov82Unhealthy
Dec92Unhealthy
Location & terrain

Where is Haiphong?

Haiphong sits at 20.9°N, 106.7°E, 12 m above sea level, in Vietnam. The nearest listed city is Kiến An, 9.0 km away.

Topography around Haiphong

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Haiphong.

Within 3 km, the terrain around Haiphong has only modest variations in elevation — a maximum elevation change of 16 m around an average of 5 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 143 m; within 80 km, large variations in elevation — a maximum elevation change of 1,180 m.

The land around Haiphong is covered by artificial surfaces (59%) within 3 km, cropland (24%) and artificial surfaces (24%) within 16 km, and trees (35%), water (29%) and cropland (24%) within 80 km.

3 km
16 m
16 km
143 m
80 km
1,180 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
September weather nearby: Kiến An 9.0 km · Đố Sơn 20 km · Thành Phố Uông Bí 21 km · Thị Trấn Mạo Khê 24 km · Thị Trấn Đông Triều 30 km · Hải Dương 37 km · Cát Bà 41 km · Ha Long 42 km

Vietnam travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C / F
220 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,066
2025
Happiness
6.4 / 10
World Happiness, 2025
Safe drinking water
59%
of population, 2024
Homicide rate
1.5
per 100k, 2011
Road deaths
30.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 500
Religion
none 86%Catholic 6%Buddhist 6%Protestant 1%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Haiphong (20.8648°, 106.6834°, elevation 12 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).