Ayutthaya weather in May

In May, Ayutthaya sees average daytime highs of 35°C and overnight lows near 27°C, with 159 mm of rain across 22.2 wet days and about 12.7 hours of daylight. It is the 2nd-warmest and 4th-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 miserable.

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 Ayutthaya's 8th-clearest and 7th-windiest month. For the whole year in context, see Ayutthaya's year-round climate.

Daytime high
35°
2nd warmest
Overnight low
27°
12th coldest
Rainfall
159 mm
22.2 wet days
Daylight
12 h 42 min
5:54 AM – 6:34 PM
Cloud cover
79%
8th clearest
Wind
9 km/h
7th windiest
Solar energy
5.57 kWh/m²
Travel score
1.6
out of 10

Ayutthaya is city in Phra Nakhon Si Ayutthaya province, Thailand.

Air quality
Elevated
PM10 47.6 µg/m³ · 2017
Density
3,425/km²
people per km²
Founded
1350

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 Ayutthaya reaches about 35°C in the afternoon and slips back to 27°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.

25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13627
23627
33627
43627
53627
63627
73627
83627
93627
103627
113627
123527
133527
143527
153527
163527
173527
183527
193527
203527
213527
223527
233527
243527
253527
263527
273527
283527
293527
303527
313527

How May really feels in Ayutthaya

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.

Ayutthaya weather by month

How May compares with the rest of the year at a glance. May is the 2nd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 22°122.711.24.6
Feb34° / 23°143.111.53.7
Mar35° / 26°467.611.92.6
Apr36° / 27°7712.912.31.7
May35° / 27°15922.212.71.6
Jun34° / 27°14923.412.81.8
Jul34° / 26°14923.612.82.0
Aug34° / 26°17524.512.52.0
Sep33° / 26°26625.812.12.1
Oct33° / 25°16419.311.72.9
Nov33° / 24°335.711.34.0
Dec32° / 22°8211.24.7

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 13% of May, with mostly cloudy or overcast conditions the remaining 79%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24060
33763
43664
53565
63268
73169
82971
92872
102575
112476
122278
132278
142080
151981
161882
171783
181684
191486
201387
211387
221288
231288
241288
251288
261189
271090
281090
291090
30991
31991

Chance of precipitation in May

Any precipitation

Ayutthaya gets around 159 mm of rain over 22.2 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 72% and peaks near 80% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
160
261
362
462
563
664
765
866
967
1068
1170
1271
1372
1473
1574
1674
1775
1875
1976
2076
2176
2276
2377
2477
2577
2677
2778
2878
2979
3079
3180

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 85% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
112277
212178
312079
401981
501981
601882
701783
801783
901684
1001684
1101585
1201585
1301585
1401486
1501486
1601486
1701486
1801486
1901486
2001486
2101387
2201387
2301387
2401387
2501387
2601387
2701387
2801387
2901387
3001387
3101387

Wind in May

Winds average 9 km/h in May.

Across May, daily wind ranges from about 8 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
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
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 6:00 AM to 5:52 AM, and sunset from 6:30 PM to 6:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.56:006:30
212.55:596:30
312.55:596:31
412.55:586:31
512.65:586:31
612.65:576:31
712.65:576:31
812.65:576:32
912.65:566:32
1012.65:566:32
1112.65:566:32
1212.65:556:33
1312.65:556:33
1412.65:556:33
1512.75:546:34
1612.75:546:34
1712.75:546:34
1812.75:546:34
1912.75:536:35
2012.75:536:35
2112.75:536:35
2212.75:536:36
2312.75:536:36
2412.75:526:36
2512.75:526:37
2612.75:526:37
2712.85:526:37
2812.85:526:38
2912.85:526:38
3012.85:526:38
3112.85:526:38

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.57 kWh/m².

For context, solar energy here swings from a low near 4.56 kWh/m² to a high of 6.16 kWh/m² in April across the year — May's 5.57 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.7Bright
95.7Bright
105.7Bright
115.6Bright
125.6Bright
135.6Bright
145.6Bright
155.5Bright
165.5Bright
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
305.4Bright
315.4Bright
Planning a trip in May

Hazard calendar for Ayutthaya

In seasonPeak

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

Ayutthaya'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 Ayutthaya?

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

1.6
Sightseeing
12th-best month of the year
3.6
Beach & pool
12th-best month of the year

May is a weaker month for outdoor sightseeing in Ayutthaya.

What to pack for Ayutthaya in May

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

In May, Ayutthaya sees daytime highs around 35°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.

light clothesrain gearsun protection

UV index in Ayutthaya 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 Ayutthaya peaks around August 15 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 15UV 13Nov 23UV 8
UV index (midday)Level
Jan9Very high
Feb9Very high
Mar12Extreme
Apr11Extreme
May11Extreme
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec8Very high

Air quality in Ayutthaya 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 Ayutthaya is worst in January — around 83 µg/m³ PM2.5 (unhealthy), about 1.9× the cleanest month (July, 43 µg/m³).

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

0306090JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyJan 2382 µg/m³Jul 2443 µg/m³
PM2.5 (µg/m³)Level
Jan83Unhealthy
Feb81Unhealthy
Mar70Unhealthy
Apr64Unhealthy
May54Poor
Jun44Poor
Jul43Poor
Aug43Poor
Sep54Poor
Oct66Unhealthy
Nov67Unhealthy
Dec66Unhealthy
Location & terrain

Where is Ayutthaya?

Ayutthaya sits at 14.4°N, 100.6°E, 7 m above sea level, in Thailand. The nearest listed city is Bang Ban, 10 km away.

Topography around Ayutthaya

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

Within 3 km, the terrain around Ayutthaya has only modest variations in elevation — a maximum elevation change of 13 m around an average of 6 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 40 m; within 80 km, large variations in elevation — a maximum elevation change of 1,097 m.

The land around Ayutthaya is covered by artificial surfaces (38%) and trees (37%) within 3 km, cropland (52%) within 16 km, and cropland (56%) and trees (25%) within 80 km.

3 km
13 m
16 km
40 m
80 km
1,097 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Bang Ban 10 km · Nakhon Luang 13 km · Bang Pa-in 14 km · Wang Noi 20 km · Phak Hai 25 km · Tha Ruea 29 km · Nong Khae 31 km · Khlong Luang 33 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 Ayutthaya (14.3517°, 100.5774°, elevation 7 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).