Si Sa Ket weather in May

In May, Si Sa Ket sees average daytime highs of 35°C and overnight lows near 26°C, with 134 mm of rain across 20.3 wet days and about 12.7 hours of daylight. It is the 3rd-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 35°C through the month. The sky is clear or mostly clear about 8% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 12 h 30 min at the start of May to 12 h 48 min by month's end. Set against the rest of the year, May is Si Sa Ket's 8th-clearest and 10th-windiest month. For the whole year in context, see Si Sa Ket's year-round climate.

Daytime high
35°
3rd warmest
Overnight low
26°
12th coldest
Rainfall
134 mm
20.3 wet days
Daylight
12 h 42 min
5:38 AM – 6:20 PM
Cloud cover
79%
8th clearest
Wind
8 km/h
10th windiest
Solar energy
5.63 kWh/m²
Travel score
1.9
out of 10

Si Sa Ket is town in Si Sa Ket province, Thailand.

Density
1,221/km²
people per km²

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 35°C through the month.

A typical May day in Si Sa Ket reaches about 35°C in the afternoon and slips back to 26°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 38°C. Set against its neighbours, May runs about 1°C cooler than April and about 1°C warmer than June.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13626
23626
33626
43626
53626
63526
73526
83526
93526
103526
113526
123526
133526
143526
153526
163526
173526
183526
193526
203526
213426
223426
233426
243426
253426
263426
273426
283426
293426
303426
313426

How May really feels in Si Sa Ket

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.

Si Sa Ket 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
Jan31° / 19°41.111.25.5
Feb33° / 21°71.711.54.3
Mar35° / 24°29611.92.7
Apr36° / 26°6611.412.31.9
May35° / 26°13420.312.71.9
Jun34° / 26°14420.212.92.2
Jul33° / 26°17123.312.82.4
Aug32° / 25°21824.912.52.4
Sep32° / 25°25024.412.12.6
Oct31° / 24°12114.911.73.8
Nov31° / 22°324.311.35.1
Dec30° / 20°71.611.15.9

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% 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 78%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24357
34159
43961
53961
63763
73466
83268
93169
102971
112674
122476
132278
142179
151981
161882
171783
181684
191585
201486
211387
221387
231387
241288
251189
261189
271189
281189
291189
301090
31991

Chance of precipitation in May

Any precipitation

Si Sa Ket gets around 134 mm of rain over 20.3 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 65% and peaks near 70% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
154
255
356
457
558
659
760
861
962
1063
1164
1265
1366
1467
1568
1668
1769
1869
1969
2070
2170
2270
2370
2470
2569
2669
2769
2869
2969
3068
3168

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 52% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1086923
2076825
3076627
4066529
5056431
6056233
7046135
8036037
9035839
10025741
11125542
12125344
13115246
14115147
15115049
16114950
17114850
18104752
19104653
20104554
21104554
22004456
23004456
24004456
25004357
26004357
27004357
28004357
29004357
30004258
31004357

Wind in May

Winds average 8 km/h in May.

Across May, daily wind ranges from about 7 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 30 min at the start of May to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over May. Sunrise moves from 5:44 AM to 5:35 AM, and sunset from 6:16 PM to 6:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:446:16
212.55:436:16
312.65:436:16
412.65:426:17
512.65:426:17
612.65:426:17
712.65:416:17
812.65:416:18
912.65:406:18
1012.65:406:18
1112.65:406:18
1212.75:396:19
1312.75:396:19
1412.75:396:19
1512.75:386:20
1612.75:386:20
1712.75:386:20
1812.75:376:21
1912.75:376:21
2012.75:376:21
2112.75:376:21
2212.85:366:22
2312.85:366:22
2412.85:366:22
2512.85:366:23
2612.85:366:23
2712.85:366:23
2812.85:366:24
2912.85:366:24
3012.85:356:24
3112.85:356:25

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.63 kWh/m².

For context, solar energy here swings from a low near 4.42 kWh/m² to a high of 6.13 kWh/m² in April across the year — May's 5.63 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.0Bright
26.0Bright
35.9Bright
45.9Bright
55.9Bright
65.8Bright
75.8Bright
85.8Bright
95.8Bright
105.7Bright
115.7Bright
125.7Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in May

Hazard calendar for Si Sa Ket

In seasonPeak

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

Si Sa Ket'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 Si Sa Ket?

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

1.9
Sightseeing
11th-best month of the year
4.1
Beach & pool
11th-best month of the year

May is a weaker month for outdoor sightseeing in Si Sa Ket.

What to pack for Si Sa Ket in May

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

In May, Si Sa Ket sees daytime highs around 35°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

UV index in Si Sa Ket 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 Si Sa Ket peaks around August 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 23 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 13Nov 23UV 8
UV index (midday)Level
Jan9Very high
Feb10Very high
Mar11Extreme
Apr11Extreme
May11Extreme
Jun12Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct11Extreme
Nov8Very high
Dec8Very high

Air quality in Si Sa Ket 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 Si Sa Ket is worst in March — around 58 µg/m³ PM2.5 (unhealthy), about 3.1× the cleanest month (December, 19 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorPoorModerateMar 1656 µg/m³Dec 1319 µg/m³
PM2.5 (µg/m³)Level
Jan29Moderate
Feb45Poor
Mar58Unhealthy
Apr43Poor
May28Moderate
Jun21Moderate
Jul23Moderate
Aug23Moderate
Sep27Moderate
Oct28Moderate
Nov22Moderate
Dec19Moderate
Location & terrain

Where is Si Sa Ket?

Si Sa Ket sits at 15.1°N, 104.3°E, 134 m above sea level, in Thailand. The nearest listed city is Ubon Ratchathani, 57 km away.

SurinPhibun Mangsahan

Topography around Si Sa Ket

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

Within 3 km, the terrain around Si Sa Ket has only modest variations in elevation — a maximum elevation change of 32 m around an average of 126 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 45 m; within 80 km, significant variations in elevation — a maximum elevation change of 557 m.

The land around Si Sa Ket is covered by trees (47%) and artificial surfaces (31%) within 3 km, cropland (70%) within 16 km, and cropland (71%) and trees (25%) within 80 km.

3 km
32 m
16 km
45 m
80 km
557 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Ubon Ratchathani 57 km · Warin Chamrap 58 km · Kantharalak 63 km · Yasothon 78 km · Det Udom 84 km · Amnat Charoen 89 km · Surin 93 km · Phibun Mangsahan 98 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 Si Sa Ket (15.1148°, 104.3294°, elevation 134 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).