Chachoengsao weather in May

In May, Chachoengsao sees average daytime highs of 34°C and overnight lows near 27°C, with 191 mm of rain across 23.7 wet days and about 12.6 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 34°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 42 min by month's end. Set against the rest of the year, May is Chachoengsao's 8th-clearest and 8th-windiest month. For the whole year in context, see Chachoengsao's year-round climate.

Daytime high
34°
3rd warmest
Overnight low
27°
12th coldest
Rainfall
191 mm
23.7 wet days
Daylight
12 h 36 min
5:53 AM – 6:31 PM
Cloud cover
80%
8th clearest
Wind
8 km/h
8th windiest
Solar energy
5.37 kWh/m²
Travel score
1.9
out of 10

Chachoengsao is town in Chachoengsao province, Thailand.

Air quality
Elevated
PM2.5 16 µg/m³ · 2019
Founded
1549

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 34°C through the month.

A typical May day in Chachoengsao reaches about 34°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 37°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)
13527
23527
33527
43527
53527
63527
73527
83527
93527
103427
113427
123427
133427
143427
153427
163427
173427
183427
193427
203427
213427
223427
233427
243427
253427
263427
273427
283427
293427
303427
313427

How May really feels in Chachoengsao

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.

Chachoengsao 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
Jan32° / 22°183.811.34.8
Feb33° / 23°194.311.54.0
Mar35° / 25°6110.211.92.9
Apr35° / 26°9715.312.32.1
May34° / 27°19123.712.61.9
Jun33° / 27°18124.512.82.1
Jul33° / 26°19625.412.72.2
Aug33° / 26°21426.512.52.2
Sep32° / 26°29326.912.12.2
Oct32° / 25°17619.611.73.0
Nov32° / 24°335.611.44.2
Dec32° / 22°91.911.25.1

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 11% of May, with mostly cloudy or overcast conditions the remaining 81%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13763
23763
33565
43466
53367
63169
72971
82872
92773
102476
112377
122179
132080
141981
151882
161783
171684
181486
191486
201387
211288
221090
231090
24991
25991
26991
27991
28892
29892
30892
31892

Chance of precipitation in May

Any precipitation

Chachoengsao gets around 191 mm of rain over 23.7 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 77% and peaks near 83% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
168
269
369
470
570
671
772
872
973
1074
1175
1275
1376
1477
1577
1678
1778
1879
1979
2079
2180
2280
2380
2481
2581
2681
2782
2882
2982
3083
3183

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 95% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
11090
2991
3991
4892
5892
6793
7793
8793
9694
10694
11694
12595
13595
14595
15595
16496
17496
18496
19496
20496
21496
22496
23496
24496
25496
26496
27496
28496
29496
30496
31496

Wind in May

Winds average 8 km/h in May.

Across May, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 30 min at the start of May to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over May. Sunrise moves from 5:58 AM to 5:51 AM, and sunset from 6:27 PM to 6:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:586:27
212.55:586:28
312.55:586:28
412.55:576:28
512.55:576:28
612.55:566:28
712.55:566:29
812.65:566:29
912.65:556:29
1012.65:556:29
1112.65:546:30
1212.65:546:30
1312.65:546:30
1412.65:546:30
1512.65:536:31
1612.65:536:31
1712.65:536:31
1812.65:536:31
1912.75:526:32
2012.75:526:32
2112.75:526:32
2212.75:526:33
2312.75:526:33
2412.75:516:33
2512.75:516:34
2612.75:516:34
2712.75:516:34
2812.75:516:34
2912.75:516:35
3012.75:516:35
3112.75:516:35

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.37 kWh/m².

For context, solar energy here swings from a low near 4.47 kWh/m² to a high of 6 kWh/m² in April across the year — May's 5.37 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.6Bright
65.6Bright
75.6Bright
85.5Bright
95.5Bright
105.5Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in May

Hazard calendar for Chachoengsao

In seasonPeak

In May, Chachoengsao sits inside its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.

Chachoengsao sits in the Pacific typhoon belt; the season peaks July–October.

Chachoengsao's rainy season runs May–October, when most of the year's rain falls.

Pacific typhoon
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is May a good time to visit Chachoengsao?

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

1.9
Sightseeing
12th-best month of the year
3.9
Beach & pool
8th-best month of the year

May is a weaker month for outdoor sightseeing in Chachoengsao.

What to pack for Chachoengsao in May

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

In May, Chachoengsao sees daytime highs around 34°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Chachoengsao in May

The nearest coast averages about 31°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 41 km away) is warmest in May at about 31°C and coldest in January near 27°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb28Tropical
Mar29Tropical
Apr30Tropical
May31Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Chachoengsao in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Chachoengsao peaks around August 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 9 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeExtremeVery highAug 15UV 13Dec 13UV 9
UV index (midday)Level
Jan9Very high
Feb10Very high
Mar12Extreme
Apr12Extreme
May9Very high
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct10Very high
Nov9Very high
Dec9Very high

Air quality in Chachoengsao 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 Chachoengsao is worst in January — around 22 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (June, 11 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Chachoengsao's WHO annual average of 16 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateJan 2322 µg/m³Jun 2011 µg/m³
PM2.5 (µg/m³)Level
Jan22Moderate
Feb22Moderate
Mar18Moderate
Apr15Moderate
May13Moderate
Jun11Good
Jul12Good
Aug12Good
Sep16Moderate
Oct19Moderate
Nov17Moderate
Dec16Moderate
Location & terrain

Where is Chachoengsao?

Chachoengsao sits at 13.7°N, 101.1°E, 4 m above sea level, in Thailand. The nearest listed city is Bang Pakong, 18 km away.

Topography around Chachoengsao

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

Within 3 km, the terrain around Chachoengsao has only modest variations in elevation — a maximum elevation change of 12 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 36 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,243 m.

The land around Chachoengsao is covered by trees (37%) and artificial surfaces (36%) within 3 km, cropland (43%) and trees (23%) within 16 km, and trees (37%) and cropland (26%) within 80 km.

3 km
12 m
16 km
36 m
80 km
1,243 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Bang Pakong 18 km · Phan Thong 24 km · Ban Khlong Bang Sao Thong 26 km · Nong Chok 29 km · Phanat Nikhom 30 km · Bang Bo District 30 km · Phanom Sarakham 31 km · Lat Krabang 31 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 Chachoengsao (13.6882°, 101.0716°, elevation 4 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).