Cha-am weather in May

In May, Cha-am sees average daytime highs of 32°C and overnight lows near 28°C, with 91 mm of rain across 17.5 wet days and about 12.6 hours of daylight. It is the 2nd-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 10% of the time in May, and the air most often feels miserable.

Daylight stretches from about 12 h 24 min at the start of May to 12 h 42 min by month's end. Set against the rest of the year, May is Cha-am's 8th-clearest and 10th-windiest month. For the whole year in context, see Cha-am's year-round climate.

Daytime high
32°
2nd warmest
Overnight low
28°
12th coldest
Rainfall
91 mm
17.5 wet days
Daylight
12 h 36 min
5:59 AM – 6:34 PM
Cloud cover
78%
8th clearest
Wind
11 km/h
10th windiest
Solar energy
5.59 kWh/m²
Travel score
3.1
out of 10

Cha-am is town in Phetchaburi province, Thailand.

Density
75/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 32°C through the month.

A typical May day in Cha-am reaches about 32°C in the afternoon and slips back to 28°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 34°C. Set against its neighbours, May runs on par with April and on par with June.

25°28°30°33°35°151015202531
Avg high (°C)Avg low (°C)
13228
23228
33228
43228
53228
63228
73228
83228
93228
103228
113228
123228
133228
143228
153228
163227
173227
183227
193227
203227
213227
223227
233227
243227
253227
263227
273227
283227
293227
303227
313227

How May really feels in Cha-am

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
11 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.

Cha-am weather by month

How May compares with the rest of the year at a glance. May is the 2nd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°172.611.36.9
Feb30° / 25°10211.66.4
Mar31° / 26°485.411.95.2
Apr32° / 27°538.812.34.1
May32° / 28°9117.512.63.1
Jun32° / 27°6214.312.73.4
Jul31° / 27°8116.212.73.5
Aug31° / 27°8618.312.43.4
Sep30° / 26°1402012.13.4
Oct29° / 26°25323.111.73.7
Nov29° / 26°768.611.45.5
Dec29° / 24°172.611.36.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 12% 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 (%)
14555
24357
34258
44060
53862
63664
73466
83268
93070
102971
112773
122674
132377
142377
152080
161981
171882
181882
191684
201585
211387
221387
231288
241288
251189
261189
271189
28991
29991
30892
31892

Chance of precipitation in May

Any precipitation

Cha-am gets around 91 mm of rain over 17.5 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 56% and peaks near 60% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
145
246
347
448
549
650
751
853
954
1055
1156
1257
1358
1458
1559
1659
1759
1859
1960
2060
2160
2260
2360
2459
2559
2659
2758
2858
2957
3057
3156

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 61% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
13070
23070
33070
43070
53070
63169
73169
83268
93367
103367
113466
123664
133763
143862
153961
164060
174159
184258
194357
204456
214456
224555
234555
244654
254654
264654
274654
284555
294555
304555
314555

Wind in May

Winds average 11 km/h in May.

Across May, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 24 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 18 minutes over May. Sunrise moves from 6:04 AM to 5:57 AM, and sunset from 6:31 PM to 6:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:046:31
212.56:036:31
312.56:036:31
412.56:036:31
512.56:026:32
612.56:026:32
712.56:016:32
812.56:016:32
912.56:016:32
1012.56:006:33
1112.56:006:33
1212.66:006:33
1312.65:596:33
1412.65:596:34
1512.65:596:34
1612.65:596:34
1712.65:586:34
1812.65:586:35
1912.65:586:35
2012.65:586:35
2112.65:586:35
2212.65:586:36
2312.65:576:36
2412.65:576:36
2512.75:576:37
2612.75:576:37
2712.75:576:37
2812.75:576:37
2912.75:576:38
3012.75:576:38
3112.75:576:38

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.59 kWh/m².

For context, solar energy here swings from a low near 4.44 kWh/m² to a high of 6.33 kWh/m² in April across the year — May's 5.59 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.0Intense
26.0Intense
36.0Bright
45.9Bright
55.9Bright
65.9Bright
75.8Bright
85.8Bright
95.8Bright
105.7Bright
115.7Bright
125.7Bright
135.6Bright
145.6Bright
155.6Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
315.3Bright
Planning a trip in May

Hazard calendar for Cha-am

In seasonPeak

In May, Cha-am sits inside its cyclone season. The full year is below, with each hazard's peak months called out.

Cha-am sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.

Cha-am's rainy season runs September–October, when most of the year's rain falls.

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

Is May a good time to visit Cha-am?

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

3.1
Sightseeing
12th-best month of the year
5.2
Beach & pool
9th-best month of the year

May is a weaker month for outdoor sightseeing in Cha-am.

What to pack for Cha-am in May

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

In May, Cha-am sees daytime highs around 32°C and nights near 28°C. Pack light clothes and rain gear. Worth having: sun protection. About 18 days see rain.

light clothesrain gearsun protection

Sea temperature near Cha-am 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 19 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
Feb28Warm
Mar29Tropical
Apr30Tropical
May31Tropical
Jun30Tropical
Jul30Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Cha-am 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 Cha-am peaks around August 16 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 highExtremeVery highAug 16UV 14Jan 1UV 9
UV index (midday)Level
Jan9Very high
Feb10Very high
Mar12Extreme
Apr12Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec9Very high

Air quality in Cha-am 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 Cha-am is worst in February — around 34 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (August, 14 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateFeb 2234 µg/m³Aug 2014 µg/m³
PM2.5 (µg/m³)Level
Jan32Moderate
Feb34Moderate
Mar34Moderate
Apr31Moderate
May19Moderate
Jun14Moderate
Jul15Moderate
Aug14Moderate
Sep14Moderate
Oct22Moderate
Nov27Moderate
Dec29Moderate
Location & terrain

Where is Cha-am?

Cha-am sits at 12.8°N, 100.0°E, 5 m above sea level, in Thailand. The nearest listed city is Tha Yang, 19 km away.

Topography around Cha-am

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

Within 3 km, the terrain around Cha-am has only modest variations in elevation — a maximum elevation change of 214 m around an average of 7 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 643 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,314 m.

The land around Cha-am is covered by artificial surfaces (22%), trees (21%) and grassland (20%) within 3 km, water (41%) and trees (27%) within 16 km, and trees (46%) and water (40%) within 80 km.

3 km
214 m
16 km
643 m
80 km
1,314 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Tha Yang 19 km · Hua Hin 26 km · Phetchaburi 35 km · Pran Buri 47 km · Khao Yoi 51 km · Sam Roi Yot 60 km · Samut Songkhram 68 km · Damnoen Saduak 80 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 Cha-am (12.8°, 99.9667°, elevation 5 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).