Thị Trấn Lam Sơn weather in May

In May, Thị Trấn Lam Sơn sees average daytime highs of 32°C and overnight lows near 25°C, with 196 mm of rain across 17.6 wet days and about 12.9 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Highs climb over the month, from about 31°C in the first days to 33°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 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 Thị Trấn Lam Sơn's 9th-clearest and 8th-windiest month. For the whole year in context, see Thị Trấn Lam Sơn's year-round climate.

Daytime high
32°
3rd warmest
Overnight low
25°
9th coldest
Rainfall
196 mm
17.6 wet days
Daylight
12 h 54 min
5:26 AM – 6:23 PM
Cloud cover
78%
9th clearest
Wind
6 km/h
8th windiest
Solar energy
5.12 kWh/m²
Travel score
3.2
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 31°C in the first days to 33°C by the end.

A typical May day in Thị Trấn Lam Sơn reaches about 32°C in the afternoon and slips back to 25°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 36°C. Set against its neighbours, May runs about 3°C warmer than April and about 1°C cooler than June.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13123
23124
33124
43124
53124
63124
73124
83124
93224
103224
113224
123224
133224
143224
153224
163225
173225
183225
193225
203225
213225
223225
233225
243225
253225
263325
273325
283325
293325
303325
313325

How May really feels in Thị Trấn Lam Sơn

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
12 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.

Thị Trấn Lam Sơn weather by month

How May compares with the rest of the year at a glance. May is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 15°387.510.96.4
Feb22° / 16°287.111.36.6
Mar25° / 18°559.911.96.5
Apr29° / 22°8510.912.45.2
May32° / 25°19617.612.93.2
Jun33° / 26°19216.513.22.6
Jul33° / 26°23319.613.12.6
Aug32° / 26°32624.412.72.6
Sep31° / 24°26520.612.13.4
Oct28° / 22°16114.611.55.3
Nov25° / 19°628.111.17.0
Dec22° / 15°336.310.87.0

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 13% of May, with mostly cloudy or overcast conditions the remaining 77%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12872
22872
32971
43070
53070
63070
73070
82971
92971
102971
112971
122872
132872
142575
152575
162476
172377
182278
192179
202080
212080
221981
231882
241783
251684
261684
271684
281585
291585
301585
311585

Chance of precipitation in May

Any precipitation

Thị Trấn Lam Sơn gets around 196 mm of rain over 17.6 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 56% and peaks near 60% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
146
247
348
448
549
650
751
852
953
1054
1155
1255
1356
1457
1557
1658
1758
1859
1959
2059
2159
2260
2360
2460
2560
2660
2760
2860
2960
3060
3160

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 68% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
13123649
23123550
33113452
42113354
52103256
6293158
7292960
8282862
9282763
10282664
11282565
12282565
13272467
14272467
15272368
16172369
17162370
18162271
19162271
20162172
21152173
22152074
23152074
24151975
25141877
26041779
27031681
28031582
29031582
30021484
31021385

Wind in May

Winds average 6 km/h in May.

Across May, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

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 5:34 AM to 5:23 AM, and sunset from 6:17 PM to 6:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:346:17
212.75:336:17
312.75:336:18
412.85:326:18
512.85:326:19
612.85:316:19
712.85:316:19
812.85:306:20
912.85:306:20
1012.95:296:20
1112.95:296:21
1212.95:286:21
1312.95:286:22
1412.95:276:22
1512.95:276:22
1612.95:266:23
1713.05:266:23
1813.05:266:24
1913.05:256:24
2013.05:256:24
2113.05:256:25
2213.05:246:25
2313.05:246:26
2413.05:246:26
2513.05:246:26
2613.15:236:27
2713.15:236:27
2813.15:236:28
2913.15:236:28
3013.15:236:29
3113.15:236:29

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.12 kWh/m².

For context, solar energy here swings from a low near 2.44 kWh/m² to a high of 5.24 kWh/m² in June across the year — May's 5.12 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.1Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.1Bright
135.1Bright
145.1Bright
155.1Bright
165.1Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.1Bright
275.1Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in May

Hazard calendar for Thị Trấn Lam Sơn

In seasonPeak

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

Thị Trấn Lam Sơn sits in the Pacific typhoon belt; the season peaks July–October.

Thị Trấn Lam Sơn's monsoon runs May–October, 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 Thị Trấn Lam Sơn?

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

3.2
Sightseeing
9th-best month of the year
5.2
Beach & pool
5th-best month of the year

May is a weaker month for outdoor sightseeing in Thị Trấn Lam Sơn.

What to pack for Thị Trấn Lam Sơn in May

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

In May, Thị Trấn Lam Sơn sees daytime highs around 32°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 18 days see rain.

light clothesrain gearsun protection

Sea temperature near Thị Trấn Lam Sơn in May

The nearest coast averages about 28°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 58 km away) is warmest in August at about 30°C and coldest in February near 21°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
Feb21Refreshing
Mar21Refreshing
Apr24Refreshing
May28Warm
Jun29Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct28Warm
Nov26Warm
Dec23Refreshing

UV index in Thị Trấn Lam Sơn in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Thị Trấn Lam Sơn peaks around August 13 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighAug 13UV 12Dec 15UV 6
UV index (midday)Level
Jan7High
Feb8Very high
Mar10Very high
Apr7Very high
May8Very high
Jun13Extreme
Jul11Extreme
Aug13Extreme
Sep9Very high
Oct8Very high
Nov7High
Dec6High

Air quality in Thị Trấn Lam Sơn 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 Thị Trấn Lam Sơn is worst in December — around 134 µg/m³ PM2.5 (unhealthy), about 3.8× the cleanest month (July, 35 µg/m³).

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

0306090120150JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyDec 20132 µg/m³Jul 1536 µg/m³
PM2.5 (µg/m³)Level
Jan126Unhealthy
Feb106Unhealthy
Mar94Unhealthy
Apr87Unhealthy
May60Unhealthy
Jun42Poor
Jul35Moderate
Aug46Poor
Sep69Unhealthy
Oct93Unhealthy
Nov116Unhealthy
Dec134Unhealthy
Location & terrain

Where is Thị Trấn Lam Sơn?

Thị Trấn Lam Sơn sits at 19.9°N, 105.4°E, 22 m above sea level, in Vietnam. The nearest listed city is Thanh Hóa, 40 km away.

Topography around Thị Trấn Lam Sơn

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Thị Trấn Lam Sơn.

Within 3 km, the terrain around Thị Trấn Lam Sơn has only modest variations in elevation — a maximum elevation change of 166 m around an average of 29 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 760 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,381 m.

The land around Thị Trấn Lam Sơn is covered by trees (60%) and cropland (27%) within 3 km, trees (70%) and cropland (24%) within 16 km, and trees (71%) within 80 km.

3 km
166 m
16 km
760 m
80 km
2,381 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Thanh Hóa 40 km · Bỉm Sơn 51 km · Sầm Sơn 55 km · Nga Sơn 60 km · Ninh Binh 72 km · Nghi Sơn 78 km · Hoàng Mai 78 km · Bo 86 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 Thị Trấn Lam Sơn (19.9047°, 105.4056°, elevation 22 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).