Tha Bo weather in September

In September, Tha Bo sees average daytime highs of 32°C and overnight lows near 25°C, with 274 mm of rain across 24.3 wet days and about 12.1 hours of daylight. It is the 6th-warmest and 3rd-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 12% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Tha Bo's 9th-clearest and 12th-windiest month. For the whole year in context, see Tha Bo's year-round climate.

Daytime high
32°
6th warmest
Overnight low
25°
8th coldest
Rainfall
274 mm
24.3 wet days
Daylight
12 h 06 min
6:01 AM – 6:07 PM
Cloud cover
79%
9th clearest
Wind
5 km/h
12th windiest
Solar energy
4.45 kWh/m²
Travel score
2.6
out of 10

Tha Bo is town in Nong Khai 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 32°C through the month.

A typical September day in Tha Bo 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 29°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 Tha Bo

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
21 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.

Tha Bo weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 17°101.6116.9
Feb32° / 19°142.311.45.4
Mar34° / 22°356.111.93.5
Apr35° / 25°7211.712.42.4
May34° / 26°23622.712.82.1
Jun33° / 26°25224.1132.2
Jul32° / 26°29525.3132.4
Aug32° / 25°34426.812.62.4
Sep32° / 25°27424.312.12.6
Oct31° / 24°9811.711.64.2
Nov30° / 21°212.811.25.9
Dec29° / 18°81.2117.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 77%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11189
21189
31189
41189
51189
61288
71387
81387
91486
101486
111585
121684
131783
141981
151981
162179
172278
182476
192674
202773
212971
223070
233268
243367
253565
263664
273763
283961
293961
304159

Chance of precipitation in September

Any precipitation

Tha Bo gets around 274 mm of rain over 24.3 wet days in September. 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 91% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
191
291
391
491
590
690
790
889
989
1088
1187
1287
1386
1485
1584
1682
1781
1880
1978
2077
2176
2274
2373
2471
2570
2668
2767
2865
2964
3062

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

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
10595
20694
30694
40694
50793
60793
70793
80892
90892
100991
1101090
1211089
1311188
1411287
1511485
1611584
1711683
1821781
1921880
2021979
2122078
2222177
2322375
2432572
2532671
2632869
2733067
2843165
2943363
3043561

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

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
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 24 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 30 minutes over September. Sunrise moves from 5:59 AM to 6:03 AM, and sunset from 6:20 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:596:20
212.35:596:19
312.35:596:18
412.35:596:17
512.35:596:17
612.36:006:16
712.36:006:15
812.26:006:14
912.26:006:13
1012.26:006:12
1112.26:006:11
1212.26:006:11
1312.26:016:10
1412.16:016:09
1512.16:016:08
1612.16:016:07
1712.16:016:06
1812.16:016:05
1912.06:016:04
2012.06:026:03
2112.06:026:03
2212.06:026:02
2312.06:026:01
2412.06:026:00
2511.96:025:59
2611.96:035:58
2711.96:035:57
2811.96:035:56
2911.96:035:56
3011.96:035:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.45 kWh/m².

For context, solar energy here swings from a low near 4.23 kWh/m² to a high of 6.08 kWh/m² in April across the year — September's 4.45 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.4Bright
154.4Bright
164.4Bright
174.4Bright
184.5Bright
194.5Bright
204.5Bright
214.5Bright
224.5Bright
234.6Bright
244.6Bright
254.6Bright
264.6Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for Tha Bo

In seasonPeak

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

Tha Bo sits in the Pacific typhoon belt; the season peaks July–October.

Tha Bo's monsoon runs May–September, when most of the year's rain falls.

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

Is September a good time to visit Tha Bo?

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

2.6
Sightseeing
7th-best month of the year
4.2
Beach & pool
8th-best month of the year

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

What to pack for Tha Bo in September

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

In September, Tha Bo 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 Tha Bo in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tha Bo peaks around August 11 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 11UV 13Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb10Very high
Mar12Extreme
Apr10Extreme
May11Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct10Extreme
Nov8Very high
Dec7Very high

Air quality in Tha Bo 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 Tha Bo is worst in March — around 77 µg/m³ PM2.5 (unhealthy), about 3.4× the cleanest month (July, 23 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorUnhealthyModerateMar 2376 µg/m³Jul 2123 µg/m³
PM2.5 (µg/m³)Level
Jan31Moderate
Feb44Poor
Mar77Unhealthy
Apr73Unhealthy
May32Moderate
Jun24Moderate
Jul23Moderate
Aug23Moderate
Sep24Moderate
Oct26Moderate
Nov25Moderate
Dec26Moderate
Location & terrain

Where is Tha Bo?

Tha Bo sits at 17.9°N, 102.6°E, 182 m above sea level, in Thailand. The nearest listed city is Vientiane, 13 km away.

Topography around Tha Bo

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

Within 3 km, the terrain around Tha Bo has only modest variations in elevation — a maximum elevation change of 32 m around an average of 169 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 64 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,486 m.

The land around Tha Bo is covered by cropland (43%) and trees (28%) within 3 km, cropland (47%) and trees (32%) within 16 km, and trees (54%) and cropland (39%) within 80 km.

3 km
32 m
16 km
64 m
80 km
1,486 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Vientiane 13 km · Nong Khai 17 km · Nam Som 42 km · Kut Chap 47 km · Udon Thani 53 km · Phon Charoen 65 km · Na Klang 73 km · Nong Bua Lamphu 73 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 Tha Bo (17.85°, 102.5814°, elevation 182 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). 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).