Hải Dương weather in May

In May, Hải Dương sees average daytime highs of 31°C and overnight lows near 25°C, with 244 mm of rain across 18.7 wet days and about 13 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Highs climb over the month, from about 30°C in the first days to 32°C by the end. The sky is clear or mostly clear about 10% 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 Hải Dương's 6th-clearest and 2nd-windiest month. For the whole year in context, see Hải Dương's year-round climate.

Daytime high
31°
4th warmest
Overnight low
25°
9th coldest
Rainfall
244 mm
18.7 wet days
Daylight
13 hours
5:21 AM – 6:21 PM
Cloud cover
76%
6th clearest
Wind
10 km/h
2nd windiest
Solar energy
4.86 kWh/m²
Travel score
3.3
out of 10

Hải Dương is provincial city of Hải Dương province, Vietnam.

Density
3,382/km²
people per km²
Founded
1804

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 30°C in the first days to 32°C by the end.

A typical May day in Hải Dương reaches about 31°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 35°C. Set against its neighbours, May runs about 3°C warmer than April and about 2°C cooler than June.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13024
23024
33124
43124
53124
63125
73125
83125
93125
103125
113125
123125
133125
143125
153125
163125
173225
183225
193225
203225
213226
223226
233226
243226
253226
263226
273226
283226
293226
303226
313326

How May really feels in Hải Dương

Once humidity and wind are folded in, May averages 31 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
31
7 feel dangerously hot (≥ 39°C)
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.

Hải Dương weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 14°36710.96.3
Feb22° / 16°246.611.36.5
Mar24° / 19°509.911.96.5
Apr28° / 22°8211.312.55.4
May31° / 25°24418.7133.3
Jun33° / 27°24620.413.22.4
Jul33° / 27°27622.513.12.3
Aug32° / 26°35325.312.72.4
Sep31° / 25°24419.912.13.2
Oct29° / 23°11912.611.55.2
Nov26° / 19°607.4117.0
Dec22° / 16°346.710.87.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% 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 75%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22971
32971
43070
53070
63070
73070
83070
93169
103070
113070
123070
133070
142872
152773
162773
172674
182476
192377
202377
212278
222278
232080
242080
251882
261882
271783
281783
291684
301684
311585

Chance of precipitation in May

Any precipitation

Hải Dương gets around 244 mm of rain over 18.7 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 60% and peaks near 69% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
147
248
349
450
551
652
754
855
956
1057
1158
1258
1359
1460
1561
1661
1762
1862
1963
2063
2164
2264
2365
2466
2566
2667
2768
2868
2969
3069
3169

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 66% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
115143247
215143149
314143051
414132953
514122855
604122757
704112659
804112560
903112462
1003102363
1103102364
1203102265
1303102265
1403102265
1503102265
160392266
170392266
180292168
190292168
200292069
210282070
220281971
230281971
240281872
250171775
260171775
270161677
280161578
290151480
300151381
310141283

Wind in May

Winds average 10 km/h in May.

Across May, daily wind ranges from about 9 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

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 5:29 AM to 5:17 AM, and sunset from 6:15 PM to 6:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:296:15
212.85:286:15
312.85:286:15
412.85:276:16
512.85:276:16
612.85:266:17
712.95:256:17
812.95:256:17
912.95:246:18
1012.95:246:18
1112.95:236:19
1212.95:236:19
1313.05:226:19
1413.05:226:20
1513.05:226:20
1613.05:216:21
1713.05:216:21
1813.05:206:22
1913.05:206:22
2013.05:206:22
2113.15:196:23
2213.15:196:23
2313.15:196:24
2413.15:186:24
2513.15:186:25
2613.15:186:25
2713.15:186:25
2813.15:186:26
2913.15:176:26
3013.25:176:27
3113.25:176:27

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.86 kWh/m².

For context, solar energy here swings from a low near 2.23 kWh/m² to a high of 4.96 kWh/m² in June across the year — May's 4.86 kWh/m² sits near the top of that range.

024151015202531
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.8Bright
54.8Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
304.9Bright
314.9Bright
Planning a trip in May

Hazard calendar for Hải Dương

In seasonPeak

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

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

Hải Dương'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 Hải Dương?

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

3.3
Sightseeing
8th-best month of the year
5.1
Beach & pool
5th-best month of the year

May is a weaker month for outdoor sightseeing in Hải Dương.

What to pack for Hải Dương in May

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

In May, Hải Dương sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 19 days see rain.

light clothesrain gearsun protection

Sea temperature near Hải Dương 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 46 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 Hải Dương in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hải Dương peaks around July 10 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 10UV 12Dec 17UV 6
UV index (midday)Level
Jan7High
Feb8Very high
Mar9Very high
Apr7Very high
May9Very high
Jun11Extreme
Jul12Extreme
Aug7Very high
Sep8Very high
Oct8Very high
Nov7High
Dec6High

Air quality in Hải Dương 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 Hải Dương 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 Hải Dương?

Hải Dương sits at 20.9°N, 106.3°E, 8 m above sea level, in Vietnam. The nearest listed city is Chí Linh, 14 km away.

Topography around Hải Dương

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

Within 3 km, the terrain around Hải Dương has only modest variations in elevation — a maximum elevation change of 14 m around an average of 5 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 141 m; within 80 km, large variations in elevation — a maximum elevation change of 1,005 m.

The land around Hải Dương is covered by artificial surfaces (48%) within 3 km, cropland (46%) and trees (24%) within 16 km, and trees (37%) and cropland (35%) within 80 km.

3 km
14 m
16 km
141 m
80 km
1,005 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
May weather nearby: Chí Linh 14 km · Thị Trấn Đông Triều 24 km · Mỹ Hào 26 km · Thuận Thanh 29 km · Thị Trấn Mạo Khê 30 km · Cung Kiệm 33 km · Kiến An 34 km · Lương Bằng 36 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 Hải Dương (20.941°, 106.333°, elevation 8 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).