Nam Định weather in May

In May, Nam Định sees average daytime highs of 31°C and overnight lows near 26°C, with 196 mm of rain across 16.3 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 13% of the time in May, and the air most often feels miserable.

Daylight stretches from about 12 h 42 min at the start of May to 13 h 06 min by month's end. Set against the rest of the year, May is Nam Định's 6th-clearest and 1st-windiest month. For the whole year in context, see Nam Định's year-round climate.

Daytime high
31°
4th warmest
Overnight low
26°
9th coldest
Rainfall
196 mm
16.3 wet days
Daylight
13 hours
5:23 AM – 6:21 PM
Cloud cover
74%
6th clearest
Wind
11 km/h
1st windiest
Solar energy
5.22 kWh/m²
Travel score
3.6
out of 10

Nam Định is the former provincial capital of the former Nam Dinh province, Vietnam.

Density
9,660/km²
people per km²
Founded
1921

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 Nam Định reaches about 31°C in the afternoon and slips back to 26°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 35°C. Set against its neighbours, May runs about 4°C warmer than April and about 2°C cooler than June.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13025
23025
33025
43025
53025
63025
73025
83125
93125
103125
113125
123125
133126
143126
153126
163126
173126
183126
193226
203226
213226
223226
233226
243226
253226
263226
273226
283227
293227
303227
313327

How May really feels in Nam Định

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
8 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.

Nam Định 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° / 15°285.510.96.6
Feb22° / 17°154.111.36.9
Mar24° / 19°366.411.97.0
Apr28° / 23°638.712.56.0
May31° / 26°19616.3133.6
Jun33° / 28°18916.413.22.6
Jul33° / 28°24618.413.12.6
Aug32° / 27°34223.612.72.6
Sep31° / 25°27720.612.13.3
Oct29° / 23°14213.611.55.1
Nov26° / 20°618.3116.9
Dec22° / 16°296.310.87.1

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 73%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13268
23268
33268
43367
53466
63367
73466
83466
93466
103466
113367
123367
133268
143169
153070
162971
172971
182773
192674
202674
212476
222377
232377
242080
252080
261981
271981
281882
291783
301783
311684

Chance of precipitation in May

Any precipitation

Nam Định gets around 196 mm of rain over 16.3 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 52% and peaks near 58% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
140
242
343
444
545
646
747
848
949
1050
1150
1251
1352
1452
1553
1653
1754
1854
1955
2055
2156
2256
2357
2457
2557
2658
2758
2858
2958
3058
3158

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 71% 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 (%)
114113252
204113154
303103057
403102859
50392761
60392662
70382465
80282367
90282268
100272169
110272170
120272071
130272071
140272071
150271972
160271972
170271972
180261973
190261874
200261874
210261874
220151777
230151777
240151678
250151579
260141580
270141481
280131383
290131284
300021286
310021187

Wind in May

Winds average 11 km/h in May, the windiest month of the year.

Across May, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 42 min at the start of May to 13 h 06 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 5:30 AM to 5:19 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)
112.75:306:15
212.85:306:15
312.85:296:15
412.85:296:16
512.85:286:16
612.85:276:17
712.85:276:17
812.95:266:17
912.95:266:18
1012.95:256:18
1112.95:256:18
1212.95:246:19
1312.95:246:19
1412.95:236:20
1513.05:236:20
1613.05:236:21
1713.05:226:21
1813.05:226:21
1913.05:216:22
2013.05:216:22
2113.05:216:23
2213.05:206:23
2313.15:206:23
2413.15:206:24
2513.15:206:24
2613.15:196:25
2713.15:196:25
2813.15:196:26
2913.15:196:26
3013.15:196:26
3113.15:196:27

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.

For context, solar energy here swings from a low near 2.42 kWh/m² to a high of 5.27 kWh/m² in June 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
35.2Bright
45.2Bright
55.2Bright
65.2Bright
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 Nam Định

In seasonPeak

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

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

Nam Định'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 Nam Định?

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

3.6
Sightseeing
8th-best month of the year
5.5
Beach & pool
5th-best month of the year

May is a weaker month for outdoor sightseeing in Nam Định.

What to pack for Nam Định in May

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

In May, Nam Định sees daytime highs around 31°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 16 days see rain.

light clothesrain gearsun protection

Sea temperature near Nam Định 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 40 km away) is warmest in August at about 30°C and coldest in February near 20°C.

The water stays above 20°C all year — warm enough for a swim any month.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan21Refreshing
Feb20Refreshing
Mar21Refreshing
Apr24Refreshing
May27Warm
Jun29Tropical
Jul30Tropical
Aug30Tropical
Sep29Tropical
Oct28Tropical
Nov26Warm
Dec23Refreshing

UV index in Nam Định 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 Nam Định peaks around July 12 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highVery highExtremeVery highHighJul 12UV 11Dec 16UV 6
UV index (midday)Level
Jan7High
Feb8Very high
Mar9Very high
Apr7High
May9Very high
Jun11Extreme
Jul11Extreme
Aug10Very high
Sep8Very high
Oct8Very high
Nov7High
Dec6High

Air quality in Nam Định 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 Nam Định is worst in January — around 67 µg/m³ PM2.5 (unhealthy), about 2.7× the cleanest month (July, 25 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyJan 1166 µg/m³Jul 1525 µg/m³
PM2.5 (µg/m³)Level
Jan67Unhealthy
Feb61Unhealthy
Mar61Unhealthy
Apr51Poor
May37Poor
Jun27Moderate
Jul25Moderate
Aug27Moderate
Sep41Poor
Oct52Poor
Nov56Unhealthy
Dec66Unhealthy
Location & terrain

Where is Nam Định?

Nam Định sits at 20.4°N, 106.2°E, 5 m above sea level, in Vietnam. The nearest listed city is Thái Bình, 17 km away.

Topography around Nam Định

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

Within 3 km, the terrain around Nam Định 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 63 m; within 80 km, large variations in elevation — a maximum elevation change of 1,061 m.

The land around Nam Định is covered by artificial surfaces (53%) within 3 km, cropland (59%) within 16 km, and cropland (36%), water (28%) and trees (23%) within 80 km.

3 km
14 m
16 km
63 m
80 km
1,061 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
May weather nearby: Thái Bình 17 km · Hưng Yên 27 km · Ninh Binh 28 km · Phủ Lý 30 km · Lương Bằng 36 km · Bỉm Sơn 52 km · Nga Sơn 52 km · Mỹ Hào 55 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 Nam Định (20.4339°, 106.1773°, elevation 5 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).