Surat Thani · Thailand
Ko Samui in December
In December, Ko Samui averages a daytime high of 30 °C and a night-time low of 23 °C, with about 255 mm of rain over the month. Ko Samui has no month that is both mild and dry by the measure used here.
- Average high
- 30 °C
- Average low
- 23 °C
- Rain in the month
- 255 mm
- Daylight on 15 Dec
- 11 h 30 min
- Comfortable month
- No
- Places to stay
- 244
When to go
How December compares with the rest of the year in Ko Samui
December is tied for the coolest month in Ko Samui by average daytime high; across the year the highs run from 30 °C to 34 °C and the lows from 23 °C to 25 °C. By day, December is about the same as November, and January is about the same as December.
December brings 255 mm of rain, more than the monthly average of 162 mm (1941 mm a year); it is the 3rd wettest month.
On 15 December the sun is up for about 11 h 30 min, against 11 h 30 min at the shortest and 12 h 40 min at the longest point of the year (calculated from the latitude, sunrise to sunset).
| Month | High | Low | Rain | Comfortable |
|---|---|---|---|---|
| January | 30 °C | 23 °C | 136 mm | |
| February | 31 °C | 23 °C | 29 mm | |
| March | 33 °C | 23 °C | 54 mm | |
| April | 34 °C | 25 °C | 93 mm | |
| May | 34 °C | 25 °C | 157 mm | |
| June | 33 °C | 25 °C | 116 mm | |
| July | 33 °C | 24 °C | 133 mm | |
| August | 33 °C | 24 °C | 134 mm | |
| September | 32 °C | 24 °C | 157 mm | |
| October | 31 °C | 24 °C | 259 mm | |
| November | 30 °C | 24 °C | 418 mm | |
| December | 30 °C | 23 °C | 255 mm |
Comfortable means average daytime high between 18 °C and 29 °C and under 80 mm of rain in the month. Averages for 1991–2020 over the surrounding area, a grid square about 50 km across, so a coast or a nearby mountain can make the town itself warmer or cooler. Data: CRU TS v4.10, Climatic Research Unit, University of East Anglia (Open Database License).
When to go
Is December a good time to visit Ko Samui?
Not by the measure used here: the average high of 30 °C is above 29 °C and about 255 mm of rain is 80 mm or more. No month in Ko Samui meets it.
The measure is about weather for a city stay only; it says nothing about events, school holidays or prices.
Public holidays in Thailand in December
Nationwide public holidays; shops and offices may close on these dates.
Where to stay
Where to stay in Ko Samui
This guide lists 244 places to stay in Ko Samui, hotels recorded in Wikidata. By straight-line distance from the centre: under 1 km, 1; 1–3 km, 8; 3–10 km, 34; 10 km or more, 201.
Sources: climate from CRU TS v4.10 (Climatic Research Unit, University of East Anglia; Open Database License), 1991–2020 averages; day length calculated from the latitude; public holidays from python-holidays (MIT); places to stay from each operator's own public pages and Wikidata. How this guide is made.