Ko Chang weather in December

In December, Ko Chang sees average daytime highs of 29°C and overnight lows near 25°C, with 18 mm of rain across 3.8 wet days and about 11.3 hours of daylight. It is the 5th-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 41% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 11 h 18 min at the start of December to 11 h 18 min by month's end. Set against the rest of the year, December is Ko Chang's 4th-clearest and 4th-windiest month. For the whole year in context, see Ko Chang's year-round climate.

Daytime high
29°
5th warmest
Overnight low
25°
2nd coldest
Rainfall
18 mm
3.8 wet days
Daylight
11 h 18 min
6:28 AM – 5:46 PM
Cloud cover
50%
4th clearest
Wind
15 km/h
4th windiest
Solar energy
5.09 kWh/m²
Travel score
6.6
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical December day in Ko Chang reaches about 29°C in the afternoon and slips back to 25°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 30°C. Set against its neighbours, December runs on par with November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12926
22926
32926
42926
52926
62926
72926
82926
92926
102926
112926
122926
132926
142925
152925
162925
172925
182825
192825
202825
212825
222825
232825
242825
252825
262825
272825
282825
292825
302825
312825

How December really feels in Ko Chang

Once humidity and wind are folded in, December averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Ko Chang weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 25°286.311.47.0
Feb28° / 26°266.511.67.1
Mar28° / 27°7113.211.95.6
Apr29° / 27°11517.112.34.5
May29° / 27°44827.912.53.1
Jun29° / 27°59528.612.73.0
Jul28° / 26°61229.912.63.0
Aug28° / 26°54729.412.43.1
Sep28° / 26°53728.612.13.3
Oct28° / 26°27823.111.74.0
Nov29° / 26°518.211.45.7
Dec29° / 25°183.811.36.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 20% of December, with mostly cloudy or overcast conditions the remaining 39%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25743
35743
45743
55743
65743
75743
85842
95842
105842
115842
125941
136040
146040
156040
166139
176139
186139
196238
206238
216337
226436
236436
246535
256535
266535
276535
286634
296634
306634
316733

Chance of precipitation in December

Any precipitation

Ko Chang gets around 18 mm of rain over 3.8 wet days in December, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 12% and peaks near 18% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
118
218
318
418
517
617
717
816
915
1015
1114
1213
1313
1412
1511
1611
1710
1810
1910
209
219
229
238
248
258
268
278
288
298
309
319

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the oppressive band about 44% of days. Sticky, muggy-or-worse air turns up on roughly 83% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
116275511
217285311
317295310
418305110
51831519
61932509
71933499
811034488
911034478
1011134468
1111234457
1211234457
1321334447
1421434437
1521533437
1621633427
1731633426
1831733416
1931833406
2031832406
2131833396
2241933396
2341933385
2441933385
2541934384
2641934394
2741934393
2841834403
2941834413
3041734423
3131635442

Wind in December

Winds average 15 km/h in December.

Across December, daily wind ranges from about 14 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 18 min at the start of December to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over December. Sunrise moves from 6:20 AM to 6:35 AM, and sunset from 5:41 PM to 5:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.36:205:41
211.36:215:41
311.36:215:41
411.36:225:42
511.36:225:42
611.36:235:42
711.36:235:43
811.36:245:43
911.36:245:43
1011.36:255:44
1111.36:255:44
1211.36:265:44
1311.36:275:45
1411.36:275:45
1511.36:285:45
1611.36:285:46
1711.36:295:46
1811.36:295:47
1911.36:305:47
2011.36:305:48
2111.36:315:48
2211.36:315:49
2311.36:315:49
2411.36:325:49
2511.36:325:50
2611.36:335:50
2711.36:335:51
2811.36:345:51
2911.36:345:52
3011.36:355:52
3111.36:355:53

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.09 kWh/m².

For context, solar energy here swings from a low near 4.28 kWh/m² to a high of 5.99 kWh/m² in April across the year — December's 5.09 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.1Bright
165.1Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in December

Hazard calendar for Ko Chang

In seasonPeak

In December, Ko Chang sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

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

Ko Chang's monsoon runs May–October, when most of the year's rain falls.

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

Is December a good time to visit Ko Chang?

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

6.6
Sightseeing
3rd-best month of the year
8.0
Beach & pool
1st-best month of the year

December is a reasonable time to visit Ko Chang for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Ko Chang in December

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

In December, Ko Chang sees daytime highs around 29°C and nights near 25°C. Pack light clothes. Worth having: sun protection. About 4 days see rain.

light clothessun protection

Sea temperature near Ko Chang in December

The nearest coast averages about 29°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 21 km away) is warmest in May at about 31°C and coldest in January near 28°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
Jan28Tropical
Feb28Tropical
Mar29Tropical
Apr30Tropical
May31Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Ko Chang in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December 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 Ko Chang peaks around August 17 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 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 17UV 14Dec 12UV 9
UV index (midday)Level
Jan10Very high
Feb10Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec9Very high

Air quality in Ko Chang in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Ko Chang is worst in February — around 25 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (November, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodFeb 1424 µg/m³Nov 1410 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb25Moderate
Mar20Moderate
Apr16Moderate
May12Moderate
Jun12Moderate
Jul14Moderate
Aug12Good
Sep11Good
Oct11Good
Nov10Good
Dec11Good
Location & terrain

Where is Ko Chang?

Ko Chang sits at 12.0°N, 102.3°E, 0 m above sea level, in Thailand. The nearest listed city is Laem Ngop, 17 km away.

Topography around Ko Chang

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

Within 3 km, the terrain around Ko Chang has large variations in elevation — a maximum elevation change of 647 m around an average of 114 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 735 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,628 m.

The land around Ko Chang is covered by trees (67%) and water (29%) within 3 km, water (74%) and trees (25%) within 16 km, and water (55%) and trees (38%) within 80 km.

3 km
647 m
16 km
735 m
80 km
1,628 m
treesgrasslandcroplandartificial surfaceswatermangroves
December weather nearby: Laem Ngop 17 km · Trat 32 km · Khao Saming 37 km · Laem Sing 54 km · Chanthaburi 66 km · Khlong Yai 71 km · Tha Mai 72 km · Koh Kong 88 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 Ko Chang (12.0451°, 102.3003°, elevation 0 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).