Den Chai weather in May

In May, Den Chai sees average daytime highs of 34°C and overnight lows near 25°C, with 205 mm of rain across 20.6 wet days and about 12.8 hours of daylight. It is the 3rd-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 35°C in the first days to 33°C by the end. The sky is clear or mostly clear about 18% of the time in May, and the air most often feels miserable.

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 Den Chai's 8th-clearest and 6th-windiest month. For the whole year in context, see Den Chai's year-round climate.

Daytime high
34°
3rd warmest
Overnight low
25°
12th coldest
Rainfall
205 mm
20.6 wet days
Daylight
12 h 48 min
5:51 AM – 6:41 PM
Cloud cover
73%
8th clearest
Wind
6 km/h
6th windiest
Solar energy
5.25 kWh/m²
Travel score
2.3
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 35°C in the first days to 33°C by the end.

A typical May day in Den Chai reaches about 34°C in the afternoon and slips back to 25°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 38°C. Set against its neighbours, May runs about 2°C cooler than April and about 2°C warmer than June.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13525
23525
33525
43525
53525
63525
73525
83425
93425
103425
113425
123425
133425
143425
153425
163425
173425
183325
193325
203325
213325
223325
233325
243325
253325
263325
273325
283325
293325
303325
313325

How May really feels in Den Chai

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
31 feel dangerously hot (≥ 39°C)
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.

Den Chai weather by month

How May compares with the rest of the year at a glance. May is the 3rd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 16°182.1116.2
Feb33° / 18°101.311.44.7
Mar35° / 21°314.111.92.9
Apr36° / 24°629.112.42.0
May34° / 25°20520.612.82.3
Jun32° / 25°23625.113.12.4
Jul31° / 25°27427.1132.5
Aug31° / 24°34128.912.62.5
Sep31° / 24°29526.612.12.6
Oct31° / 23°12615.811.63.9
Nov31° / 20°304.611.25.4
Dec29° / 17°14210.96.6

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 14% of May, with mostly cloudy or overcast conditions the remaining 69%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25545
35446
45248
55149
64852
74654
84555
94258
104060
113961
123664
133565
143367
153268
162971
172872
182773
192476
202377
212278
222080
232080
241882
251882
261684
271684
281486
291387
301189
311189

Chance of precipitation in May

Any precipitation

Den Chai gets around 205 mm of rain over 20.6 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 67% and peaks near 79% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
150
251
352
453
554
655
756
858
959
1061
1163
1264
1366
1467
1569
1670
1771
1871
1972
2073
2173
2274
2374
2475
2575
2675
2776
2876
2977
3078
3179

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the miserable band about 51% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
1126721
2106723
3106525
496427
586230
676132
765935
865638
955540
1045343
1145145
1234947
1334849
1434651
1534453
1624355
1724157
1824058
1923959
2023860
2123761
2223662
2323563
2423464
2523266
2623167
2723068
2822870
2922771
3022573
3112376

Wind in May

Winds average 6 km/h in May.

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

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

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 5:58 AM to 5:47 AM, and sunset from 6:36 PM to 6:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:586:36
212.75:576:37
312.75:576:37
412.75:566:37
512.75:566:38
612.75:556:38
712.75:556:38
812.75:546:38
912.85:546:39
1012.85:536:39
1112.85:536:40
1212.85:526:40
1312.85:526:40
1412.85:516:41
1512.85:516:41
1612.85:516:41
1712.95:506:42
1812.95:506:42
1912.95:506:42
2012.95:506:43
2112.95:496:43
2212.95:496:44
2312.95:496:44
2412.95:496:44
2512.95:486:45
2612.95:486:45
2713.05:486:45
2813.05:486:46
2913.05:486:46
3013.05:486:47
3113.05:476:47

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.25 kWh/m².

For context, solar energy here swings from a low near 3.86 kWh/m² to a high of 6.24 kWh/m² in April across the year — May's 5.25 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.8Bright
35.8Bright
45.8Bright
55.7Bright
65.7Bright
75.6Bright
85.6Bright
95.5Bright
105.5Bright
115.4Bright
125.4Bright
135.3Bright
145.3Bright
155.2Bright
165.2Bright
175.2Bright
185.1Bright
195.1Bright
205.1Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
304.8Bright
314.8Bright
Planning a trip in May

Hazard calendar for Den Chai

In seasonPeak

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

Den Chai's monsoon runs May–September, 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 Den Chai?

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

2.3
Sightseeing
11th-best month of the year
4.4
Beach & pool
8th-best month of the year

May is a weaker month for outdoor sightseeing in Den Chai.

What to pack for Den Chai in May

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

In May, Den Chai sees daytime highs around 34°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 21 days see rain.

light clothesrain gearsun protection

UV index in Den Chai in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Den Chai peaks around June 19 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 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 highJun 19UV 13Dec 16UV 7
UV index (midday)Level
Jan8Very high
Feb10Very high
Mar9Very high
Apr10Extreme
May12Extreme
Jun13Extreme
Jul12Extreme
Aug13Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec7Very high

Air quality in Den Chai 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 Den Chai is worst in March — around 63 µg/m³ PM2.5 (unhealthy), about 3.1× the cleanest month (June, 21 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorModeratePoorMar 1862 µg/m³Jun 2321 µg/m³
PM2.5 (µg/m³)Level
Jan43Poor
Feb49Poor
Mar63Unhealthy
Apr53Poor
May31Moderate
Jun21Moderate
Jul21Moderate
Aug22Moderate
Sep26Moderate
Oct31Moderate
Nov33Moderate
Dec36Poor
Location & terrain

Where is Den Chai?

Den Chai sits at 18.0°N, 100.1°E, 159 m above sea level, in Thailand. The nearest listed city is Phrae, 20 km away.

ThoenSukhothaiBan Na

Topography around Den Chai

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

Within 3 km, the terrain around Den Chai has only modest variations in elevation — a maximum elevation change of 159 m around an average of 166 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,034 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,610 m.

The land around Den Chai is covered by trees (46%) and cropland (40%) within 3 km, trees (81%) within 16 km, and trees (76%) within 80 km.

3 km
159 m
16 km
1,034 m
80 km
1,610 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Phrae 20 km · Uttaradit 40 km · Si Satchanalai 60 km · Lampang 68 km · Sawankhalok 78 km · Thoen 98 km · Sukhothai 111 km · Ban Na 113 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 Den Chai (17.9837°, 100.0522°, elevation 159 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).