Bo Phloi weather in September

In September, Bo Phloi sees average daytime highs of 32°C and overnight lows near 25°C, with 212 mm of rain across 24.3 wet days and about 12.1 hours of daylight. It is the 7th-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 Bo Phloi's 9th-clearest and 8th-windiest month. For the whole year in context, see Bo Phloi's year-round climate.

Daytime high
32°
7th warmest
Overnight low
25°
7th coldest
Rainfall
212 mm
24.3 wet days
Daylight
12 h 06 min
6:14 AM – 6:19 PM
Cloud cover
85%
9th clearest
Wind
7 km/h
8th windiest
Solar energy
4.41 kWh/m²
Travel score
2.5
out of 10

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 Bo Phloi 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 on par with 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
263225
273225
283225
293225
303225

How September really feels in Bo Phloi

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.

Bo Phloi weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 21°142.511.25.1
Feb34° / 22°142.811.53.7
Mar36° / 24°417.411.92.3
Apr37° / 26°8213.812.31.6
May35° / 26°13521.512.71.8
Jun33° / 26°12921.312.82.2
Jul32° / 25°16122.612.82.6
Aug32° / 25°1572312.52.7
Sep32° / 25°21224.312.12.5
Oct31° / 24°1702011.73.4
Nov31° / 23°366.111.34.8
Dec31° / 21°91.811.25.6

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
6793
7793
8793
9793
10793
11793
12892
13991
14991
15991
16991
171189
181288
191288
201387
211387
221486
231486
241486
251585
261585
271585
281684
291684
301684

Chance of precipitation in September

Any precipitation

Bo Phloi gets around 212 mm of rain over 24.3 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 81% and peaks near 85% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
177
277
377
478
578
678
778
879
979
1079
1179
1280
1380
1481
1581
1682
1782
1883
1983
2083
2183
2283
2383
2484
2584
2684
2784
2885
2985
3085

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 68% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
108416
208317
308218
408218
508119
608020
707921
807822
907723
1007624
1107525
1207426
1307228
1407129
1507030
1606832
1706733
1806634
1906436
2006337
2116039
2215940
2305941
2405842
2505743
2605644
2705545
2815445
2915346
3015346

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 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
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 6:13 AM to 6:15 AM, and sunset from 6:30 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:136:30
212.36:136:29
312.36:136:29
412.26:136:28
512.26:136:27
612.26:136:26
712.26:146:26
812.26:146:25
912.26:146:24
1012.26:146:23
1112.16:146:23
1212.16:146:22
1312.16:146:21
1412.16:146:20
1512.16:146:19
1612.16:146:19
1712.16:146:18
1812.16:146:17
1912.06:146:16
2012.06:146:16
2112.06:146:15
2212.06:146:14
2312.06:146:13
2412.06:146:12
2512.06:146:12
2611.96:146:11
2711.96:146:10
2811.96:146:09
2911.96:156:09
3011.96:156:08

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.41 kWh/m².

For context, solar energy here swings from a low near 4.24 kWh/m² to a high of 6.26 kWh/m² in April across the year — September's 4.41 kWh/m² sits near the bottom.

012345151015202530
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
174.4Bright
184.4Bright
194.4Bright
204.4Bright
214.4Bright
224.4Bright
234.4Bright
244.4Bright
254.4Bright
264.4Bright
274.4Bright
284.4Bright
294.4Bright
304.4Bright
Planning a trip in September

Hazard calendar for Bo Phloi

In seasonPeak

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

Bo Phloi'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 Bo Phloi?

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

2.5
Sightseeing
8th-best month of the year
4.0
Beach & pool
11th-best month of the year

September is a weaker month for outdoor sightseeing in Bo Phloi.

What to pack for Bo Phloi in September

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

In September, Bo Phloi sees daytime highs around 32°C and nights near 25°C. Pack light clothes and rain gear. About 24 days see rain.

light clothesrain gear

UV index in Bo Phloi 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 Bo Phloi peaks around August 16 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 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 16UV 14Dec 12UV 8
UV index (midday)Level
Jan9Very high
Feb10Very high
Mar13Extreme
Apr11Extreme
May12Extreme
Jun12Extreme
Jul13Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in Bo Phloi 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 Bo Phloi is worst in March — around 57 µg/m³ PM2.5 (unhealthy), about 2.7× the cleanest month (June, 21 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorPoorModerateMar 1356 µg/m³Jun 2221 µg/m³
PM2.5 (µg/m³)Level
Jan45Poor
Feb53Poor
Mar57Unhealthy
Apr43Poor
May30Moderate
Jun21Moderate
Jul22Moderate
Aug22Moderate
Sep26Moderate
Oct33Moderate
Nov32Moderate
Dec33Moderate
Location & terrain

Where is Bo Phloi?

Bo Phloi sits at 14.3°N, 99.5°E, 96 m above sea level, in Thailand. The nearest listed city is Kanchanaburi, 36 km away.

Topography around Bo Phloi

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

Within 3 km, the terrain around Bo Phloi has only modest variations in elevation — a maximum elevation change of 244 m around an average of 104 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 574 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,266 m.

The land around Bo Phloi is covered by trees (50%) and grassland (20%) within 3 km, cropland (55%) and trees (31%) within 16 km, and trees (47%) and cropland (44%) within 80 km.

3 km
244 m
16 km
574 m
80 km
1,266 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Kanchanaburi 36 km · Tha Muang 43 km · Tha Maka 55 km · Suphan Buri 67 km · Ban Pong 69 km · Bang Len 78 km · Chom Bueng 79 km · Photharam 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 Bo Phloi (14.3252°, 99.5147°, elevation 96 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).