Thị Trấn Lam Sơn weather in September

In September, Thị Trấn Lam Sơn sees average daytime highs of 31°C and overnight lows near 24°C, with 265 mm of rain across 20.6 wet days and about 12.1 hours of daylight. It is the 5th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 18% 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 Thị Trấn Lam Sơn's 5th-clearest and 9th-windiest month. For the whole year in context, see Thị Trấn Lam Sơn's year-round climate.

Daytime high
31°
5th warmest
Overnight low
24°
8th coldest
Rainfall
265 mm
20.6 wet days
Daylight
12 h 06 min
5:49 AM – 5:56 PM
Cloud cover
75%
5th clearest
Wind
6 km/h
9th windiest
Solar energy
4.21 kWh/m²
Travel score
3.4
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical September day in Thị Trấn Lam Sơn reaches about 31°C in the afternoon and slips back to 24°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 33°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)
13125
23125
33125
43125
53125
63125
73125
83125
93125
103125
113125
123125
133125
143125
153124
163124
173124
183124
193024
203024
213024
223024
233024
243024
253024
263024
273024
283024
293024
303023

How September really feels in Thị Trấn Lam Sơn

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
3 feel dangerously hot (≥ 39°C)
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.

Thị Trấn Lam Sơn weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 2nd-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 September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 72%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11783
21783
31882
41882
51882
61882
71981
82080
92080
102179
112179
122476
132575
142575
152674
162971
172971
183169
193268
203367
213565
223565
233763
243862
253862
263961
274060
284060
294258
304159

Chance of precipitation in September

Any precipitation

Thị Trấn Lam Sơn gets around 265 mm of rain over 20.6 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 69% 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
381
481
580
680
779
878
977
1076
1175
1274
1373
1472
1570
1669
1768
1866
1965
2063
2162
2261
2360
2459
2559
2658
2758
2857
2957
3057

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 68% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
100694
200793
300892
400991
5011089
6111187
7111286
8121384
9121582
10121681
11131779
12131977
13142075
14142273
15152371
16152569
17162667
18162865
19172963
20173161
21183259
22193456
23293653
242103751
252113949
262114046
273124144
283134242
293134340
304144338

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
257calm
267calm
277calm
287calm
297calm
307calm

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 5:46 AM to 5:52 AM, and sunset from 6:10 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:466:10
212.45:466:09
312.45:476:08
412.35:476:07
512.35:476:06
612.35:476:05
712.35:476:05
812.35:486:04
912.25:486:03
1012.25:486:02
1112.25:486:01
1212.25:496:00
1312.25:495:59
1412.25:495:58
1512.15:495:57
1612.15:495:56
1712.15:505:55
1812.15:505:54
1912.15:505:53
2012.05:505:52
2112.05:505:51
2212.05:515:50
2312.05:515:49
2412.05:515:48
2511.95:515:48
2611.95:525:47
2711.95:525:46
2811.95:525:45
2911.95:525:44
3011.85:525:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.21 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 — September's 4.21 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.3Bright
54.2Bright
64.2Bright
74.2Bright
84.2Bright
94.2Bright
104.2Bright
114.2Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.1Bright
Planning a trip in September

Hazard calendar for Thị Trấn Lam Sơn

In seasonPeak

In September, 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 September a good time to visit Thị Trấn Lam Sơn?

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

3.4
Sightseeing
8th-best month of the year
4.9
Beach & pool
6th-best month of the year

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

What to pack for Thị Trấn Lam Sơn in September

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

In September, Thị Trấn Lam Sơn sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. About 21 days see rain.

light clothesrain gear

Sea temperature near Thị Trấn Lam Sơn 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 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 September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 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 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 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
September 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).