Laem Ngop weather in September

In September, Laem Ngop sees average daytime highs of 29°C and overnight lows near 25°C, with 480 mm of rain across 29.5 wet days and about 12.1 hours of daylight. It is the 10th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 0% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 12 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Laem Ngop's 12th-clearest and 9th-windiest month. For the whole year in context, see Laem Ngop's year-round climate.

Daytime high
29°
10th warmest
Overnight low
25°
7th coldest
Rainfall
480 mm
29.5 wet days
Daylight
12 h 06 min
6:03 AM – 6:07 PM
Cloud cover
92%
12th clearest
Wind
6 km/h
9th windiest
Solar energy
3.89 kWh/m²
Travel score
2.7
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical September day in Laem Ngop reaches about 29°C in the afternoon and slips back to 25°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 31°C. Set against its neighbours, September runs on par with August and about 1°C cooler than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12925
22925
32925
42925
52925
62925
72925
82925
92925
102925
112925
122925
132925
142925
152925
162925
172925
182925
192925
202925
212925
222925
232925
242925
252925
263025
273025
283025
293025
303025

How September really feels in Laem Ngop

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
heat index over the day's high
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.

Laem Ngop weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°377.711.45.1
Feb31° / 24°469.811.64.8
Mar31° / 25°11919.511.93.7
Apr31° / 26°17122.912.33.0
May31° / 26°35329.312.62.5
Jun30° / 26°48229.312.72.6
Jul29° / 25°54930.512.62.7
Aug29° / 25°53330.512.42.7
Sep29° / 25°48029.512.12.7
Oct30° / 25°29024.811.73.1
Nov31° / 24°6910.111.44.6
Dec30° / 23°224.611.35.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 3% of September, with mostly cloudy or overcast conditions the remaining 97%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1397
2397
3397
4298
5298
6298
7298
8298
9298
10298
11298
12298
13298
14298
15298
16298
17397
18397
19397
20496
21496
22496
23496
24496
25496
26496
27496
28496
29496
30595

Chance of precipitation in September

Any precipitation

Laem Ngop gets around 480 mm of rain over 29.5 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 98% and peaks near 99% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
198
298
398
498
598
698
799
899
999
1099
1198
1298
1398
1498
1598
1698
1798
1898
1998
2098
2198
2298
2398
2498
2598
2698
2798
2898
2997
3097

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 99% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
1298
2298
3298
4298
5298
6199
7199
8199
9199
10199
11199
12199
13199
14199
15199
16199
17199
18199
19199
20199
21199
22199
23199
24199
25298
26298
27298
28298
29298
30397

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
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 12 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over September. Sunrise moves from 6:03 AM to 6:03 AM, and sunset from 6:17 PM to 5:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:036:17
212.26:036:17
312.26:036:16
412.26:036:15
512.26:036:15
612.26:036:14
712.26:036:13
812.26:036:12
912.16:036:12
1012.16:036:11
1112.16:036:10
1212.16:036:10
1312.16:036:09
1412.16:036:08
1512.16:036:07
1612.16:036:07
1712.16:036:06
1812.06:036:05
1912.06:036:05
2012.06:036:04
2112.06:036:03
2212.06:036:02
2312.06:036:02
2412.06:036:01
2512.06:036:00
2612.06:036:00
2711.96:035:59
2811.96:035:58
2911.96:035:58
3011.96:035:57

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.89 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.89 kWh/m² to a high of 5.62 kWh/m² in April across the year — September's 3.89 kWh/m² sits near the bottom.

012345151015202530
Solar energy (kWh/m²)Level
14.0Bright
24.0Bright
34.0Bright
44.0Moderate
54.0Moderate
64.0Moderate
73.9Moderate
83.9Moderate
93.9Moderate
103.9Moderate
113.9Moderate
123.8Moderate
133.8Moderate
143.8Moderate
153.8Moderate
163.8Moderate
173.8Moderate
183.8Moderate
193.8Moderate
203.8Moderate
213.8Moderate
223.8Moderate
233.8Moderate
243.9Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Laem Ngop

In seasonPeak

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

Laem Ngop sits in the Pacific typhoon belt; the season peaks July–October.

Laem Ngop'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 Laem Ngop?

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

2.7
Sightseeing
8th-best month of the year
3.6
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Laem Ngop.

What to pack for Laem Ngop in September

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

In September, Laem Ngop sees daytime highs around 29°C and nights near 25°C. Pack light clothes and rain gear. About 30 days see rain.

light clothesrain gear

Sea temperature near Laem Ngop in September

The nearest coast averages about 29°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 30 km away) is warmest in May at about 31°C and coldest in January near 28°C.

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

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb28Tropical
Mar29Tropical
Apr30Tropical
May31Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Tropical

UV index in Laem Ngop in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Laem Ngop peaks around August 17 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 17UV 14Dec 12UV 9
UV index (midday)Level
Jan10Very high
Feb10Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec9Very high

Air quality in Laem Ngop 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 Laem Ngop is worst in February — around 40 µg/m³ PM2.5 (poor), about 3.8× the cleanest month (November, 11 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateGoodFeb 1539 µg/m³Nov 1411 µg/m³
PM2.5 (µg/m³)Level
Jan28Moderate
Feb40Poor
Mar27Moderate
Apr19Moderate
May13Moderate
Jun12Moderate
Jul13Moderate
Aug12Good
Sep11Good
Oct11Good
Nov11Good
Dec12Good
Location & terrain

Where is Laem Ngop?

Laem Ngop sits at 12.2°N, 102.4°E, 6 m above sea level, in Thailand. The nearest listed city is Trat, 15 km away.

Topography around Laem Ngop

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

Within 3 km, the terrain around Laem Ngop has only modest variations in elevation — a maximum elevation change of 79 m around an average of 5 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 704 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,728 m.

The land around Laem Ngop is covered by water (60%) and trees (26%) within 3 km, trees (48%) and water (40%) within 16 km, and trees (45%) and water (45%) within 80 km.

3 km
79 m
16 km
704 m
80 km
1,728 m
treesgrasslandcroplandartificial surfaceswatermangroves
September weather nearby: Trat 15 km · Ko Chang 17 km · Khao Saming 21 km · Laem Sing 49 km · Chanthaburi 58 km · Tha Mai 66 km · Khlong Yai 69 km · Pailin 79 km

Thailand travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C
230 V · 50 Hz
Prices
≈ 31% of US
price level, 2025
GDP per capita
$8,057
2025
Happiness
6.3 / 10
World Happiness, 2025
Homicide rate
4.8
per 100k, 2011
Road deaths
32.2
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very low
EF EPI 402
Religion
Buddhist 93%Muslim 5%Christian 1%other 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 Laem Ngop (12.1713°, 102.3947°, elevation 6 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).