Haiphong weather in May

In May, Haiphong sees average daytime highs of 29°C and overnight lows near 26°C, with 207 mm of rain across 16.9 wet days and about 13 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 28°C in the first days to 30°C by the end. The sky is clear or mostly clear about 19% of the time in May, and the air most often feels miserable.

Daylight stretches from about 12 h 48 min at the start of May to 13 h 12 min by month's end. Set against the rest of the year, May is Haiphong's 6th-clearest and 3rd-windiest month. For the whole year in context, see Haiphong's year-round climate.

Daytime high
29°
5th warmest
Overnight low
26°
8th coldest
Rainfall
207 mm
16.9 wet days
Daylight
13 hours
5:20 AM – 6:19 PM
Cloud cover
71%
6th clearest
Wind
14 km/h
3rd windiest
Solar energy
5.22 kWh/m²
Travel score
4.5
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 28°C in the first days to 30°C by the end.

A typical May day in Haiphong reaches about 29°C in the afternoon and slips back to 26°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 32°C. Set against its neighbours, May runs about 4°C warmer than April and about 2°C cooler than June.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12825
22825
32825
42825
52825
62825
72825
82925
92925
102926
112926
122926
132926
142926
152926
162926
172926
182926
193026
203026
213026
223026
233026
243027
253027
263027
273027
283027
293027
303027
313027

How May really feels in Haiphong

Once humidity and wind are folded in, May averages 28 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
28
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Haiphong weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 5th-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 May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 14% of May, with mostly cloudy or overcast conditions the remaining 67%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14258
24258
34258
44258
54258
64258
74357
84258
94258
104159
114060
123961
133862
143763
153565
163565
173466
183169
193169
203070
212872
222773
232674
242575
252575
262377
272377
282278
292179
302080
312080

Chance of precipitation in May

Any precipitation

Haiphong gets around 207 mm of rain over 16.9 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 54% and peaks near 61% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
140
242
343
444
546
647
748
849
950
1051
1151
1252
1353
1453
1554
1654
1755
1856
1956
2057
2157
2258
2359
2459
2560
2660
2761
2861
2961
3061
3161

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the miserable band about 70% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
114113450
214113252
304103155
403102958
50392860
60392761
70292564
80292465
90292366
100282268
110282268
120282169
130282169
140282070
150282070
160181972
170181972
180181972
190181873
200171874
210171775
220171775
230161776
240161677
250161677
260151579
270151480
280141382
290041383
300031285
310031186

Wind in May

Winds average 14 km/h in May.

Across May, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 48 min at the start of May to 13 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over May. Sunrise moves from 5:28 AM to 5:16 AM, and sunset from 6:13 PM to 6:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:286:13
212.85:276:13
312.85:276:14
412.85:266:14
512.85:256:15
612.85:256:15
712.95:246:15
812.95:246:16
912.95:236:16
1012.95:236:17
1112.95:226:17
1212.95:226:18
1312.95:216:18
1413.05:216:18
1513.05:206:19
1613.05:206:19
1713.05:196:20
1813.05:196:20
1913.05:196:20
2013.05:186:21
2113.15:186:21
2213.15:186:22
2313.15:176:22
2413.15:176:23
2513.15:176:23
2613.15:176:23
2713.15:166:24
2813.15:166:24
2913.15:166:25
3013.25:166:25
3113.25:166:26

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.22 kWh/m² — the sunniest month for solar.

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 — May's 5.22 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in May

Hazard calendar for Haiphong

In seasonPeak

In May, 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 May a good time to visit Haiphong?

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

4.5
Sightseeing
8th-best month of the year
5.7
Beach & pool
4th-best month of the year

May is a reasonable time to visit Haiphong for sightseeing.

What to pack for Haiphong in May

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

In May, Haiphong sees daytime highs around 29°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 17 days see rain.

light clothesrain gearsun protection

Sea temperature near Haiphong in May

The nearest coast averages about 27°C in May — 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 May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 10 (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 May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May 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
May 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).