Nakhon Ratchasima weather in September

In September, Nakhon Ratchasima sees average daytime highs of 32°C and overnight lows near 25°C, with 231 mm of rain across 24.5 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 32°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 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 Nakhon Ratchasima's 9th-clearest and 11th-windiest month. For the whole year in context, see Nakhon Ratchasima's year-round climate.

Daytime high
32°
8th warmest
Overnight low
25°
7th coldest
Rainfall
231 mm
24.5 wet days
Daylight
12 h 06 min
6:03 AM – 6:08 PM
Cloud cover
85%
9th clearest
Wind
7 km/h
11th windiest
Solar energy
4.56 kWh/m²
Travel score
2.5
out of 10

Nakhon Ratchasima is Capital city of Nakhon Ratchasima Province, Thailand.

Air quality
Elevated
PM2.5 24 µg/m³ · 2019
Density
3,370/km²
people per km²
Founded
1656

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 32°C through the month.

A typical September day in Nakhon Ratchasima 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 30°C and 34°C. Set against its neighbours, September runs about 1°C cooler than August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13225
23225
33225
43225
53225
63225
73225
83225
93225
103225
113225
123225
133225
143225
153225
163225
173225
183225
193225
203225
213225
223225
233225
243225
253225
263125
273125
283125
293125
303125

How September really feels in Nakhon Ratchasima

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.

Nakhon Ratchasima 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
Jan31° / 19°71.711.25.7
Feb33° / 21°91.711.54.3
Mar35° / 24°386.711.92.7
Apr36° / 25°6912.612.32.0
May35° / 26°14020.112.72.0
Jun34° / 26°11919.412.92.1
Jul33° / 26°12621.112.82.3
Aug33° / 25°16122.812.52.4
Sep32° / 25°23124.512.12.5
Oct31° / 24°13816.411.73.7
Nov31° / 22°294.811.35.1
Dec30° / 19°51.311.16.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 8% of September, with mostly cloudy or overcast conditions the remaining 88%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1694
2694
3694
4694
5694
6694
7793
8793
9793
10793
11991
12991
13991
14991
151090
161189
171189
181288
191486
201585
211585
221585
231783
241783
251882
261882
271981
282080
292080
302278

Chance of precipitation in September

Any precipitation

Nakhon Ratchasima gets around 231 mm of rain over 24.5 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 82% and peaks near 83% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
181
281
381
481
582
682
782
882
982
1083
1183
1283
1383
1483
1583
1683
1783
1883
1983
2082
2182
2282
2381
2481
2581
2680
2780
2880
2979
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 59% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
107030
207030
306931
406832
506832
606733
706634
806535
916237
1016138
1116039
1215940
1315841
1415742
1515742
1615643
1715643
1815544
1915544
2015445
2115445
2225345
2325345
2425345
2525345
2625444
2725444
2835443
2935542
3035542

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 6:04 AM, and sunset from 6:20 PM to 5:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:026:20
212.36:036:19
312.36:036:19
412.36:036:18
512.26:036:17
612.26:036:16
712.26:036:16
812.26:036:15
912.26:036:14
1012.26:036:13
1112.26:036:12
1212.16:036:12
1312.16:036:11
1412.16:036:10
1512.16:036:09
1612.16:036:08
1712.16:036:08
1812.16:046:07
1912.06:046:06
2012.06:046:05
2112.06:046:04
2212.06:046:04
2312.06:046:03
2412.06:046:02
2512.06:046:01
2611.96:046:00
2711.96:046:00
2811.96:045:59
2911.96:045:58
3011.96:045:57

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.56 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.56 kWh/m² to a high of 6.08 kWh/m² in April across the year — September's 4.56 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
94.6Bright
104.6Bright
114.6Bright
124.5Bright
134.5Bright
144.5Bright
154.5Bright
164.5Bright
174.5Bright
184.5Bright
194.5Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for Nakhon Ratchasima

In seasonPeak

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

Nakhon Ratchasima'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 Nakhon Ratchasima?

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

2.5
Sightseeing
7th-best month of the year
4.0
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Nakhon Ratchasima.

What to pack for Nakhon Ratchasima in September

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

In September, Nakhon Ratchasima sees daytime highs around 32°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

UV index in Nakhon Ratchasima 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 Nakhon Ratchasima peaks around August 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 22 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 highExtremeExtremeVery highAug 13UV 14Nov 22UV 8
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar13Extreme
Apr11Extreme
May10Very high
Jun13Extreme
Jul13Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov8Very high
Dec8Very high

Air quality in Nakhon Ratchasima 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 Nakhon Ratchasima is worst in March — around 37 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (June, 18 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Nakhon Ratchasima's WHO annual average of 24 µg/m³.

010203040JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMar 1337 µg/m³Jun 2218 µg/m³
PM2.5 (µg/m³)Level
Jan27Moderate
Feb34Moderate
Mar37Poor
Apr30Moderate
May23Moderate
Jun18Moderate
Jul18Moderate
Aug19Moderate
Sep21Moderate
Oct23Moderate
Nov20Moderate
Dec19Moderate
Location & terrain

Where is Nakhon Ratchasima?

Nakhon Ratchasima sits at 15.0°N, 102.1°E, 187 m above sea level, in Thailand. The nearest listed city is Chok Chai, 28 km away.

Topography around Nakhon Ratchasima

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

Within 3 km, the terrain around Nakhon Ratchasima has only modest variations in elevation — a maximum elevation change of 33 m around an average of 185 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 133 m; within 80 km, large variations in elevation — a maximum elevation change of 866 m.

The land around Nakhon Ratchasima is covered by artificial surfaces (62%) and trees (27%) within 3 km, cropland (47%) and trees (27%) within 16 km, and cropland (72%) and trees (22%) within 80 km.

3 km
33 m
16 km
133 m
80 km
866 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Chok Chai 28 km · Non Sung 29 km · Amphoe Sikhiu 43 km · Dan Khun Thot 44 km · Khon Buri 52 km · Ban Huai Thalaeng 59 km · Bua Yai 77 km · Pak Chong 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 Nakhon Ratchasima (14.9707°, 102.102°, elevation 187 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).