Loei weather in September

In September, Loei sees average daytime highs of 31°C and overnight lows near 24°C, with 241 mm of rain across 24.1 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 8% 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 Loei's 9th-clearest and 12th-windiest month. For the whole year in context, see Loei's year-round climate.

Daytime high
31°
8th warmest
Overnight low
24°
8th coldest
Rainfall
241 mm
24.1 wet days
Daylight
12 h 06 min
6:04 AM – 6:10 PM
Cloud cover
82%
9th clearest
Wind
5 km/h
12th windiest
Solar energy
4.34 kWh/m²
Travel score
3.0
out of 10

Loei is town in Loei province, Thailand.

Air quality
Elevated
PM2.5 25 µg/m³ · 2019

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 31°C through the month.

A typical September day in Loei reaches about 31°C in the afternoon and slips back to 24°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 33°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)
13124
23124
33124
43124
53124
63124
73124
83124
93124
103124
113124
123124
133124
143124
153124
163124
173124
183124
193124
203124
213124
223124
233124
243124
253124
263124
273124
283124
293123
303123

How September really feels in Loei

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.

Loei weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 16°121.911.17.4
Feb31° / 18°152.811.45.7
Mar33° / 21°477.811.93.8
Apr34° / 23°8814.812.42.8
May33° / 24°19823.612.82.4
Jun32° / 25°16820.8132.7
Jul31° / 25°18822.212.92.9
Aug31° / 24°24924.812.62.8
Sep31° / 24°24124.112.13.0
Oct30° / 22°11313.711.64.6
Nov29° / 19°243.411.26.6
Dec27° / 17°101.6118.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% 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 81%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1892
2892
3892
4892
5991
61090
71189
81189
91189
101189
111387
121387
131387
141486
151684
161783
171783
181981
192080
202278
212476
222575
232674
242872
252971
263070
273268
283367
293565
303664

Chance of precipitation in September

Any precipitation

Loei gets around 241 mm of rain over 24.1 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 85% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
185
285
385
485
585
685
785
885
985
1085
1185
1284
1384
1484
1583
1682
1781
1881
1980
2079
2178
2278
2377
2476
2575
2674
2773
2872
2971
3070

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 79% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
107822
207822
307921
407921
507921
607921
707921
807921
917821
1017821
1117821
1217821
1327820
1427820
1527820
1627919
1737819
1837819
1947818
2047818
2147917
2257817
2357916
2467915
2568014
2668113
2778112
2878211
2988111
3088210

Wind in September

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

Across September, daily wind ranges from about 4 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
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
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 6:07 AM, and sunset from 6:23 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:026:23
212.36:036:22
312.36:036:22
412.36:036:21
512.36:036:20
612.36:036:19
712.26:036:18
812.26:036:17
912.26:046:16
1012.26:046:16
1112.26:046:15
1212.26:046:14
1312.16:046:13
1412.16:046:12
1512.16:046:11
1612.16:046:10
1712.16:056:09
1812.16:056:09
1912.06:056:08
2012.06:056:07
2112.06:056:06
2212.06:056:05
2312.06:056:04
2412.06:066:03
2511.96:066:02
2611.96:066:02
2711.96:066:01
2811.96:066:00
2911.96:065:59
3011.96:075:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.34 kWh/m².

For context, solar energy here swings from a low near 4.13 kWh/m² to a high of 5.97 kWh/m² in April across the year — September's 4.34 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.2Bright
24.2Bright
34.2Bright
44.2Bright
54.2Bright
64.2Bright
74.2Bright
84.2Bright
94.2Bright
104.2Bright
114.2Bright
124.2Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.4Bright
214.4Bright
224.4Bright
234.4Bright
244.4Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for Loei

In seasonPeak

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

Loei'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 Loei?

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

3.0
Sightseeing
7th-best month of the year
4.3
Beach & pool
10th-best month of the year

September is a weaker month for outdoor sightseeing in Loei.

What to pack for Loei in September

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

In September, Loei sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. About 24 days see rain.

light clothesrain gear

UV index in Loei 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 Loei peaks around August 12 at about 13 (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 12UV 13Dec 15UV 8
UV index (midday)Level
Jan9Very high
Feb10Very high
Mar12Extreme
Apr11Extreme
May11Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct10Extreme
Nov8Very high
Dec8Very high

Air quality in Loei 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 Loei is worst in March — around 50 µg/m³ PM2.5 (poor), about 3.1× the cleanest month (July, 16 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Loei's WHO annual average of 25 µg/m³.

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMar 1849 µg/m³Jul 1316 µg/m³
PM2.5 (µg/m³)Level
Jan25Moderate
Feb36Poor
Mar50Poor
Apr40Poor
May23Moderate
Jun16Moderate
Jul16Moderate
Aug17Moderate
Sep18Moderate
Oct20Moderate
Nov19Moderate
Dec20Moderate
Location & terrain

Where is Loei?

Loei sits at 17.5°N, 101.7°E, 244 m above sea level, in Thailand. The nearest listed city is Wang Saphung, 22 km away.

Lom Sak

Topography around Loei

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

Within 3 km, the terrain around Loei has significant variations in elevation — a maximum elevation change of 274 m around an average of 256 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 518 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,810 m.

The land around Loei is covered by trees (59%) and artificial surfaces (25%) within 3 km, trees (76%) within 16 km, and trees (65%) and cropland (24%) within 80 km.

3 km
274 m
16 km
518 m
80 km
1,810 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Wang Saphung 22 km · Erawan 32 km · Na Klang 53 km · Nam Som 58 km · Phu Kradueng 69 km · Nong Bua Lamphu 82 km · Kut Chap 89 km · Lom Sak 94 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 Loei (17.4905°, 101.7275°, elevation 244 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).