Si Satchanalai weather in May

In May, Si Satchanalai sees average daytime highs of 36°C and overnight lows near 26°C, with 211 mm of rain across 19.6 wet days and about 12.8 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 37°C in the first days to 35°C by the end. The sky is clear or mostly clear about 19% 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 Si Satchanalai's 8th-clearest and 5th-windiest month. For the whole year in context, see Si Satchanalai's year-round climate.

Daytime high
36°
3rd warmest
Overnight low
26°
12th coldest
Rainfall
211 mm
19.6 wet days
Daylight
12 h 48 min
5:53 AM – 6:42 PM
Cloud cover
72%
8th clearest
Wind
6 km/h
5th windiest
Solar energy
5.35 kWh/m²
Travel score
1.7
out of 10

Si Satchanalai is town in Sukhothai province, Thailand.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 37°C in the first days to 35°C by the end.

A typical May day in Si Satchanalai reaches about 36°C in the afternoon and slips back to 26°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 40°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°45°151015202531
Avg high (°C)Avg low (°C)
13727
23727
33727
43727
53727
63727
73627
83627
93627
103627
113627
123626
133626
143626
153526
163526
173526
183526
193526
203526
213526
223526
233526
243526
253526
263526
273526
283526
293526
303526
313426

How May really feels in Si Satchanalai

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 Satchanalai weather by month

How May compares with the rest of the year at a glance. May is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 18°152.111.15.4
Feb34° / 20°101.111.43.8
Mar37° / 23°263.511.92.1
Apr38° / 26°568.312.41.2
May36° / 26°21119.612.81.7
Jun34° / 26°20122.1132.1
Jul33° / 26°21523.312.92.3
Aug32° / 26°28025.712.62.4
Sep32° / 25°25923.912.12.4
Oct32° / 24°12914.511.63.5
Nov32° / 22°27411.24.8
Dec31° / 19°121.7115.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% 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 68%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25743
35545
45446
55248
65050
74852
84654
94456
104159
114060
123862
133565
143367
153169
163070
172872
182773
192575
202377
212278
222080
232080
241882
251882
261684
271684
281486
291486
301288
311189

Chance of precipitation in May

Any precipitation

Si Satchanalai gets around 211 mm of rain over 19.6 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 63% and peaks near 73% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
147
248
349
450
551
653
754
856
957
1059
1161
1262
1364
1465
1566
1666
1767
1868
1968
2069
2169
2269
2370
2470
2570
2670
2770
2871
2971
3072
3173

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 58% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
1135829
2125731
3115534
4115336
5105238
6105041
794843
894645
984448
1074350
1164153
1264054
1353857
1443759
1543660
1633562
1733463
1833364
1923266
2023167
2123068
2222969
2322969
2422870
2522771
2622672
2722573
2822474
2922375
3012277
3112178

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 7 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
317calm

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 5:59 AM to 5:49 AM, and sunset from 6:37 PM to 6:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:596:37
212.65:596:37
312.75:586:37
412.75:586:38
512.75:576:38
612.75:576:38
712.75:566:39
812.75:566:39
912.75:556:39
1012.75:556:40
1112.85:556:40
1212.85:546:40
1312.85:546:41
1412.85:536:41
1512.85:536:41
1612.85:536:42
1712.85:526:42
1812.85:526:42
1912.95:526:43
2012.95:516:43
2112.95:516:44
2212.95:516:44
2312.95:516:44
2412.95:506:45
2512.95:506:45
2612.95:506:45
2712.95:506:46
2812.95:506:46
2912.95:506:46
3013.05:506:47
3113.05:496:47

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.35 kWh/m².

For context, solar energy here swings from a low near 3.99 kWh/m² to a high of 6.3 kWh/m² in April across the year — May's 5.35 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.8Bright
55.8Bright
65.7Bright
75.7Bright
85.7Bright
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.4Bright
145.3Bright
155.3Bright
165.3Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
314.9Bright
Planning a trip in May

Hazard calendar for Si Satchanalai

In seasonPeak

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

Si Satchanalai'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 Satchanalai?

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

1.7
Sightseeing
11th-best month of the year
3.9
Beach & pool
12th-best month of the year

May is a weaker month for outdoor sightseeing in Si Satchanalai.

What to pack for Si Satchanalai in May

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

In May, Si Satchanalai sees daytime highs around 36°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 Satchanalai 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 Si Satchanalai peaks around June 19 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 highJun 19UV 13Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb10Very high
Mar9Very high
Apr11Extreme
May12Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec7Very high

Air quality in Si Satchanalai 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 Satchanalai is worst in March — around 58 µg/m³ PM2.5 (unhealthy), about 2.8× the cleanest month (June, 21 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorPoorModeratePoorMar 1556 µg/m³Jun 2221 µg/m³
PM2.5 (µg/m³)Level
Jan43Poor
Feb50Poor
Mar58Unhealthy
Apr47Poor
May29Moderate
Jun21Moderate
Jul22Moderate
Aug23Moderate
Sep26Moderate
Oct31Moderate
Nov33Moderate
Dec37Poor
Location & terrain

Where is Si Satchanalai?

Si Satchanalai sits at 17.5°N, 99.8°E, 77 m above sea level, in Thailand. The nearest listed city is Sawankhalok, 24 km away.

Topography around Si Satchanalai

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

Within 3 km, the terrain around Si Satchanalai has only modest variations in elevation — a maximum elevation change of 158 m around an average of 83 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 352 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,381 m.

The land around Si Satchanalai is covered by cropland (47%) and trees (39%) within 3 km, trees (48%) and cropland (48%) within 16 km, and trees (62%) and cropland (35%) within 80 km.

3 km
158 m
16 km
352 m
80 km
1,381 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Sawankhalok 24 km · Uttaradit 37 km · Ban Na 56 km · Sukhothai 57 km · Thoen 59 km · Den Chai 60 km · Phrae 81 km · Ban Tak 89 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 Satchanalai (17.5169°, 99.7598°, elevation 77 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).