Kaset Sombun weather in September

In September, Kaset Sombun sees average daytime highs of 30°C and overnight lows near 24°C, with 274 mm of rain across 26 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 5% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Kaset Sombun's 9th-clearest and 12th-windiest month. For the whole year in context, see Kaset Sombun's year-round climate.

Daytime high
30°
8th warmest
Overnight low
24°
8th coldest
Rainfall
274 mm
26 wet days
Daylight
12 h 06 min
6:04 AM – 6:09 PM
Cloud cover
84%
9th clearest
Wind
5 km/h
12th windiest
Solar energy
4.48 kWh/m²
Travel score
3.0
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical September day in Kaset Sombun reaches about 30°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 28°C and 32°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13024
23024
33024
43024
53024
63024
73024
83024
93024
103024
113024
123024
133024
143024
153024
163024
173024
183023
193023
203023
213023
223023
233023
243023
253023
263023
273023
283023
293023
303023

How September really feels in Kaset Sombun

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.

Kaset Sombun weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 17°112.411.17.3
Feb31° / 19°163.411.55.7
Mar33° / 22°548.611.94.1
Apr33° / 23°10415.712.43.1
May32° / 24°18923.712.72.7
Jun31° / 24°14920.9132.9
Jul31° / 24°17623.912.93.0
Aug30° / 24°22525.312.52.9
Sep30° / 24°2742612.13.0
Oct29° / 22°1401611.64.6
Nov28° / 20°284.511.26.7
Dec27° / 17°71.3118.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 5% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 9% of September, with mostly cloudy or overcast conditions the remaining 86%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1694
2694
3694
4694
5694
6694
7793
8793
9892
10991
111090
121090
131288
141387
151387
161585
171783
181783
191882
201882
212080
222080
232179
242278
252278
262377
272476
282476
292476
302674

Chance of precipitation in September

Any precipitation

Kaset Sombun gets around 274 mm of rain over 26 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 86% and peaks near 90% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
189
289
390
490
590
690
790
890
990
1089
1189
1289
1389
1488
1588
1687
1787
1886
1985
2085
2184
2284
2383
2483
2582
2682
2781
2880
2980
3079

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 83% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
108614
208614
308515
408515
508515
608515
708515
808515
908515
1008515
1118415
1218415
1318415
1418415
1518415
1628315
1728315
1828315
1938215
2038215
2148115
2248214
2358114
2458114
2568113
2668113
2778112
2888012
2988111
3098110

Wind in September

Winds average 5 km/h in September, the calmest month.

Across September, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 18 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 24 minutes over September. Sunrise moves from 6:02 AM to 6:05 AM, and sunset from 6:22 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:026:22
212.36:026:21
312.36:026:20
412.36:036:19
512.36:036:18
612.26:036:18
712.26:036:17
812.26:036:16
912.26:036:15
1012.26:036:14
1112.26:036:13
1212.26:036:13
1312.16:046:12
1412.16:046:11
1512.16:046:10
1612.16:046:09
1712.16:046:08
1812.16:046:08
1912.06:046:07
2012.06:046:06
2112.06:046:05
2212.06:046:04
2312.06:056:03
2412.06:056:03
2511.96:056:02
2611.96:056:01
2711.96:056:00
2811.96:055:59
2911.96:055:58
3011.96:055:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.48 kWh/m².

For context, solar energy here swings from a low near 4.34 kWh/m² to a high of 6.03 kWh/m² in April across the year — September's 4.48 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.4Bright
54.4Bright
64.4Bright
74.4Bright
84.4Bright
94.4Bright
104.4Bright
114.4Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
174.5Bright
184.5Bright
194.5Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.6Bright
274.6Bright
284.6Bright
294.6Bright
304.6Bright
Planning a trip in September

Hazard calendar for Kaset Sombun

In seasonPeak

In September, Kaset Sombun sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Kaset Sombun's monsoon runs May–October, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Kaset Sombun?

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

3.0
Sightseeing
8th-best month of the year
4.1
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Kaset Sombun.

What to pack for Kaset Sombun in September

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

In September, Kaset Sombun sees daytime highs around 30°C and nights near 24°C. Pack light clothes and rain gear. About 26 days see rain.

light clothesrain gear

UV index in Kaset Sombun 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 Kaset Sombun peaks around August 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 13UV 14Dec 15UV 8
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar12Extreme
Apr10Extreme
May11Extreme
Jun13Extreme
Jul13Extreme
Aug14Extreme
Sep12Extreme
Oct10Extreme
Nov9Very high
Dec8Very high

Air quality in Kaset Sombun 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 Kaset Sombun is worst in March — around 51 µg/m³ PM2.5 (poor), about 2.7× the cleanest month (June, 19 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMar 1550 µg/m³Jun 2319 µg/m³
PM2.5 (µg/m³)Level
Jan30Moderate
Feb45Poor
Mar51Poor
Apr41Poor
May27Moderate
Jun19Moderate
Jul19Moderate
Aug20Moderate
Sep21Moderate
Oct24Moderate
Nov22Moderate
Dec23Moderate
Location & terrain

Where is Kaset Sombun?

Kaset Sombun sits at 16.3°N, 102.0°E, 234 m above sea level, in Thailand. The nearest listed city is Phu Khiao, 21 km away.

Bua Yai

Topography around Kaset Sombun

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

Within 3 km, the terrain around Kaset Sombun has only modest variations in elevation — a maximum elevation change of 42 m around an average of 232 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,003 m; within 80 km, large variations in elevation — a maximum elevation change of 1,195 m.

The land around Kaset Sombun is covered by cropland (64%) and trees (22%) within 3 km, trees (47%) and cropland (44%) within 16 km, and cropland (50%) and trees (44%) within 80 km.

3 km
42 m
16 km
1,003 m
80 km
1,195 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Phu Khiao 21 km · Chum Phae 33 km · Kaeng Khro 38 km · Chaiyaphum 53 km · Phu Kradueng 68 km · Phetchabun 86 km · Ban Phai 87 km · Bua Yai 92 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 Kaset Sombun (16.2805°, 101.9542°, elevation 234 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. 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).