Loei weather in May

In May, Loei sees average daytime highs of 33°C and overnight lows near 24°C, with 198 mm of rain across 23.6 wet days and about 12.8 hours of daylight. It is the 3rd-warmest and 3rd-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 10% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of May to 13 hours by month's end. Set against the rest of the year, May is Loei's 8th-clearest and 10th-windiest month. For the whole year in context, see Loei's year-round climate.

Daytime high
33°
3rd warmest
Overnight low
24°
10th coldest
Rainfall
198 mm
23.6 wet days
Daylight
12 h 48 min
5:45 AM – 6:34 PM
Cloud cover
78%
8th clearest
Wind
5 km/h
10th windiest
Solar energy
5.24 kWh/m²
Travel score
2.4
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 May

Average highAverage lowShaded bands: 10–90% of days

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

A typical May day in Loei reaches about 33°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 36°C. Set against its neighbours, May runs about 1°C cooler than April and on par with June.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13324
23324
33324
43324
53324
63324
73324
83324
93324
103324
113324
123324
133324
143324
153324
163324
173224
183224
193224
203224
213224
223225
233225
243225
253225
263225
273225
283225
293225
303225
313225

How May really feels in Loei

Once humidity and wind are folded in, May averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Loei weather by month

How May compares with the rest of the year at a glance. May is the 3rd-warmest and 3rd-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 May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 12% of May, with mostly cloudy or overcast conditions the remaining 78%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14753
24456
34357
44159
54159
63961
73664
83367
93268
103070
112872
122674
132476
142377
152179
161882
171783
181585
191585
201387
211288
221189
231090
241090
251090
26991
27991
28991
29892
30694
31694

Chance of precipitation in May

Any precipitation

Loei gets around 198 mm of rain over 23.6 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 76% and peaks near 82% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
166
267
368
468
569
669
770
871
972
1073
1173
1274
1375
1476
1577
1678
1778
1879
1979
2080
2180
2281
2381
2481
2581
2682
2782
2882
2982
3082
3182

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the oppressive band about 77% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1110854
209865
308866
408857
507867
607858
706859
8068410
9058312
10058213
11058114
12048115
13048016
14047917
15047818
16037819
17037720
18037621
19027622
20027523
21027424
22027325
23017227
24017128
25017029
26016930
27016831
28016831
29006832
30006733
31006733

Wind in May

Winds average 5 km/h in May.

Across May, 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.

0246810151015202531
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
315calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 36 min at the start of May to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over May. Sunrise moves from 5:52 AM to 5:42 AM, and sunset from 6:29 PM to 6:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:526:29
212.65:516:29
312.75:506:30
412.75:506:30
512.75:496:30
612.75:496:31
712.75:486:31
812.75:486:31
912.75:486:31
1012.75:476:32
1112.85:476:32
1212.85:466:32
1312.85:466:33
1412.85:466:33
1512.85:456:34
1612.85:456:34
1712.85:446:34
1812.85:446:35
1912.95:446:35
2012.95:446:35
2112.95:436:36
2212.95:436:36
2312.95:436:36
2412.95:436:37
2512.95:426:37
2612.95:426:37
2712.95:426:38
2812.95:426:38
2912.95:426:39
3013.05:426:39
3113.05:426:39

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.24 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 — May's 5.24 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.6Bright
55.6Bright
65.6Bright
75.5Bright
85.5Bright
95.4Bright
105.4Bright
115.4Bright
125.3Bright
135.3Bright
145.3Bright
155.2Bright
165.2Bright
175.2Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
294.9Bright
304.9Bright
314.9Bright
Planning a trip in May

Hazard calendar for Loei

In seasonPeak

In May, 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 May a good time to visit Loei?

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

2.4
Sightseeing
12th-best month of the year
4.2
Beach & pool
11th-best month of the year

May is a weaker month for outdoor sightseeing in Loei.

What to pack for Loei in May

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

In May, Loei sees daytime highs around 33°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

UV index in Loei in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May 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
May 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).