Khao Lak weather in September

In September, Khao Lak sees average daytime highs of 28°C and overnight lows near 25°C, with 363 mm of rain across 26.3 wet days and about 12.1 hours of daylight. It is the 12th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 3% of the time in September, and the air most often feels oppressive.

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 Khao Lak's 12th-clearest and 4th-windiest month. For the whole year in context, see Khao Lak's year-round climate.

Daytime high
28°
12th warmest
Overnight low
25°
6th coldest
Rainfall
363 mm
26.3 wet days
Daylight
12 hours
6:20 AM – 6:23 PM
Cloud cover
89%
12th clearest
Wind
13 km/h
4th windiest
Solar energy
4.52 kWh/m²
Travel score
3.6
out of 10

Khao Lak is human settlement in Phang Nga Province, Thailand.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical September day in Khao Lak reaches about 28°C in the afternoon and slips back to 25°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12825
22825
32825
42825
52825
62825
72825
82825
92825
102825
112825
122825
132825
142825
152825
162825
172825
182825
192825
202825
212825
222825
232825
242825
252825
262825
272825
282825
292825
302825

How September really feels in Khao Lak

Once humidity and wind are folded in, September averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Khao Lak weather by month

How September compares with the rest of the year at a glance. September is the 12th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°679.911.65.3
Feb30° / 25°427.711.75.2
Mar30° / 25°11615.311.94.4
Apr30° / 26°16821.812.23.6
May29° / 26°30226.812.43.2
Jun29° / 26°30124.812.53.4
Jul28° / 26°28825.412.53.5
Aug28° / 25°32225.712.33.6
Sep28° / 25°36326.312.13.6
Oct28° / 25°35528.811.83.3
Nov29° / 25°20823.111.63.7
Dec29° / 25°9013.111.55.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 4% of September, with mostly cloudy or overcast conditions the remaining 94%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1892
2793
3793
4793
5793
6793
7694
8694
9694
10694
11595
12595
13595
14595
15694
16793
17793
18793
19793
20793
21793
22793
23793
24793
25694
26694
27694
28694
29595
30595

Chance of precipitation in September

Any precipitation

Khao Lak gets around 363 mm of rain over 26.3 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 88% and peaks near 93% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
184
284
384
485
585
685
785
886
986
1086
1187
1287
1387
1487
1587
1687
1787
1887
1988
2088
2189
2289
2389
2490
2590
2691
2791
2892
2992
3093

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the oppressive band about 69% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
16337
26436
36535
46634
56733
66832
76832
86931
96931
106931
116931
126931
136931
146931
157030
167030
177030
187030
197030
207030
217030
227030
237030
247129
257129
267228
277228
287327
297426
307525

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012calm

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 6:22 AM to 6:18 AM, and sunset from 6:32 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:226:32
212.26:226:31
312.26:226:31
412.16:216:30
512.16:216:29
612.16:216:29
712.16:216:28
812.16:216:28
912.16:216:27
1012.16:216:26
1112.16:216:26
1212.16:206:25
1312.16:206:25
1412.16:206:24
1512.16:206:23
1612.06:206:23
1712.06:206:22
1812.06:206:22
1912.06:206:21
2012.06:196:20
2112.06:196:20
2212.06:196:19
2312.06:196:18
2412.06:196:18
2512.06:196:17
2612.06:196:17
2712.06:196:16
2811.96:196:15
2911.96:186:15
3011.96:186:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.52 kWh/m².

For context, solar energy here swings from a low near 4.35 kWh/m² to a high of 6.1 kWh/m² in March across the year — September's 4.52 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.6Bright
54.6Bright
64.6Bright
74.6Bright
84.6Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.5Bright
154.5Bright
164.4Bright
174.4Bright
184.4Bright
194.4Bright
204.4Bright
214.4Bright
224.4Bright
234.4Bright
244.4Bright
254.4Bright
264.4Bright
274.4Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Hazard calendar for Khao Lak

In seasonPeak

In September, Khao Lak sits inside its cyclone and rainy season season. The full year is below, with each hazard's peak months called out.

Khao Lak sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.

Khao Lak's rainy season runs April–November, when most of the year's rain falls.

Cyclone
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Khao Lak?

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

3.6
Sightseeing
6th-best month of the year
4.0
Beach & pool
11th-best month of the year

September is a weaker month for outdoor sightseeing in Khao Lak.

What to pack for Khao Lak in September

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

In September, Khao Lak sees daytime highs around 28°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 26 days see rain.

light clothesrain gearsun protection

Sea temperature near Khao Lak 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 13 km away) is warmest in April at about 30°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
Feb29Tropical
Mar29Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Khao Lak in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Khao Lak peaks around August 21 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeAug 21UV 13Dec 12UV 10
UV index (midday)Level
Jan11Extreme
Feb13Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul11Extreme
Aug14Extreme
Sep13Extreme
Oct12Extreme
Nov10Extreme
Dec10Very high

Air quality in Khao Lak 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 Khao Lak is worst in March — around 16 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodMar 2216 µg/m³Nov 1211 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb14Moderate
Mar16Moderate
Apr16Moderate
May12Moderate
Jun13Moderate
Jul13Moderate
Aug11Good
Sep12Good
Oct11Good
Nov11Good
Dec12Good
Location & terrain

Where is Khao Lak?

Khao Lak sits at 8.6°N, 98.2°E, 0 m above sea level, in Thailand. The nearest listed city is Ban Kamala, 74 km away.

Topography around Khao Lak

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

Within 3 km, the terrain around Khao Lak has significant variations in elevation — a maximum elevation change of 388 m around an average of 45 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 686 m; within 80 km, large variations in elevation — a maximum elevation change of 1,077 m.

The land around Khao Lak is covered by water (50%) and trees (45%) within 3 km, water (49%) and trees (46%) within 16 km, and water (59%) and trees (37%) within 80 km.

3 km
388 m
16 km
686 m
80 km
1,077 m
treesgrasslandartificial surfaceswatermangroves
September weather nearby: Ban Kamala 74 km · Kathu 78 km · Ban Ratsada 80 km · Wichit 82 km · Phuket 82 km · Ban Talat Nua 83 km · Ban Talat Yai 83 km · Ban Ko Sire 83 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 Khao Lak (8.615°, 98.2399°, elevation 0 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).