Wiset Chaichan weather in September

In September, Wiset Chaichan sees average daytime highs of 33°C and overnight lows near 26°C, with 253 mm of rain across 25.2 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 33°C through the month. The sky is clear or mostly clear about 3% of the time in September, and the air most often feels miserable.

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 Wiset Chaichan's 9th-clearest and 11th-windiest month. For the whole year in context, see Wiset Chaichan's year-round climate.

Daytime high
33°
8th warmest
Overnight low
26°
7th coldest
Rainfall
253 mm
25.2 wet days
Daylight
12 h 06 min
6:11 AM – 6:15 PM
Cloud cover
85%
9th clearest
Wind
8 km/h
11th windiest
Solar energy
4.58 kWh/m²
Travel score
2.0
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 33°C through the month.

A typical September day in Wiset Chaichan reaches about 33°C in the afternoon and slips back to 26°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 36°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13426
23426
33426
43426
53426
63426
73426
83426
93426
103426
113426
123426
133426
143326
153326
163326
173326
183326
193326
203326
213326
223326
233326
243326
253326
263326
273326
283326
293326
303326

How September really feels in Wiset Chaichan

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
30 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.

Wiset Chaichan 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
Jan33° / 22°132.811.24.2
Feb35° / 24°143.211.53.2
Mar36° / 26°437.511.92.1
Apr37° / 27°8413.712.31.3
May36° / 27°15421.112.71.4
Jun35° / 27°12921.612.81.6
Jul34° / 27°13422.612.81.9
Aug34° / 26°15722.912.51.9
Sep33° / 26°25325.212.12.0
Oct33° / 25°16819.311.72.8
Nov33° / 24°355.911.33.8
Dec32° / 22°101.711.24.6

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 7% of September, with mostly cloudy or overcast conditions the remaining 90%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1694
2694
3694
4694
5694
6694
7694
8694
9694
10694
11793
12892
13892
14892
15892
161090
171090
181090
191189
201387
211387
221387
231387
241387
251486
261486
271486
281585
291684
301684

Chance of precipitation in September

Any precipitation

Wiset Chaichan gets around 253 mm of rain over 25.2 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 85% and peaks near 85% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
184
284
384
484
584
684
785
885
985
1085
1185
1285
1385
1485
1585
1685
1785
1885
1985
2085
2184
2284
2384
2484
2584
2684
2785
2885
2985
3084

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 69% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
104654
204654
304555
404555
504456
604357
704258
804159
904060
1003961
1103862
1203664
1303565
1403367
1503268
1603070
1702872
1802773
1902575
2002476
2102278
2202179
2302080
2401981
2501882
2601783
2701783
2801684
2901684
3011683

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
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 6:10 AM to 6:11 AM, and sunset from 6:27 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:106:27
212.36:106:26
312.36:106:25
412.26:106:25
512.26:106:24
612.26:106:23
712.26:106:22
812.26:106:22
912.26:106:21
1012.26:106:20
1112.26:106:19
1212.16:106:19
1312.16:106:18
1412.16:106:17
1512.16:116:16
1612.16:116:15
1712.16:116:15
1812.16:116:14
1912.06:116:13
2012.06:116:12
2112.06:116:11
2212.06:116:11
2312.06:116:10
2412.06:116:09
2512.06:116:08
2611.96:116:08
2711.96:116:07
2811.96:116:06
2911.96:116:05
3011.96:116:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.58 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.58 kWh/m² to a high of 6.23 kWh/m² in April across the year — September's 4.58 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.7Bright
54.7Bright
64.6Bright
74.6Bright
84.6Bright
94.6Bright
104.6Bright
114.6Bright
124.6Bright
134.6Bright
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 Wiset Chaichan

In seasonPeak

In September, Wiset Chaichan sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Wiset Chaichan's rainy season runs May–October, when most of the year's rain falls.

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

Is September a good time to visit Wiset Chaichan?

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

2.0
Sightseeing
7th-best month of the year
3.7
Beach & pool
10th-best month of the year

September is a weaker month for outdoor sightseeing in Wiset Chaichan.

What to pack for Wiset Chaichan in September

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

In September, Wiset Chaichan sees daytime highs around 33°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

UV index in Wiset Chaichan 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 Wiset Chaichan peaks around August 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 23 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 15UV 13Nov 23UV 8
UV index (midday)Level
Jan9Very high
Feb9Very high
Mar12Extreme
Apr11Extreme
May11Extreme
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec8Very high

Air quality in Wiset Chaichan 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 Wiset Chaichan is worst in January — around 83 µg/m³ PM2.5 (unhealthy), about 1.9× the cleanest month (July, 43 µg/m³).

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

0306090JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyJan 2382 µg/m³Jul 2443 µg/m³
PM2.5 (µg/m³)Level
Jan83Unhealthy
Feb81Unhealthy
Mar70Unhealthy
Apr64Unhealthy
May54Poor
Jun44Poor
Jul43Poor
Aug43Poor
Sep54Poor
Oct66Unhealthy
Nov67Unhealthy
Dec66Unhealthy
Location & terrain

Where is Wiset Chaichan?

Wiset Chaichan sits at 14.6°N, 100.3°E, 12 m above sea level, in Thailand. The nearest listed city is Phak Hai, 16 km away.

Topography around Wiset Chaichan

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

Within 3 km, the terrain around Wiset Chaichan has only modest variations in elevation — a maximum elevation change of 14 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 27 m; within 80 km, large variations in elevation — a maximum elevation change of 636 m.

The land around Wiset Chaichan is covered by cropland (57%) and trees (24%) within 3 km, cropland (66%) within 16 km, and cropland (71%) within 80 km.

3 km
14 m
16 km
27 m
80 km
636 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Phak Hai 16 km · Suphan Buri 27 km · Bang Ban 29 km · Nakhon Luang 33 km · Bang Racham 33 km · Sing Buri 33 km · Ayutthaya 37 km · Lop Buri 41 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 Wiset Chaichan (14.5952°, 100.3381°, elevation 12 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).