Ko Samui climate

Ko Samui Weather in January

NASA POWER reanalysis for the half-degree grid cell around Ko Samui, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

Average highs run from 27°C on January 1 to 28°C on January 31, and lows from 26°C to 26°C. Normal precipitation for the month is 115 mm over about 12 wet days.

January day by day

The normal high and low for each date, in °C.

Normal daily high and low temperature at Ko Samui, in °C, with the record for each date.2224262830151015202530
  • Normal low
  • Normal high
  • Reanalysis extreme high
  • Reanalysis extreme low

January at a glance

Average high
27°C
Average low
26°C
Precipitation
115 mm
Reanalysis high
29°CJan 10, 2013
Reanalysis low
24°CJan 23, 2014
Daylight
11 h 35 min to 11 h 43 min
Cloud cover
61%
Humidity
79%
Dew point
23°C
Wind
17.3 km/h

Every day of the month

A wet day has at least 1 mm of precipitation in the reanalysis.

DateNormal highNormal lowReanalysis highReanalysis lowChance wet
Jan 127°C26°C29°C 201624°C 199646%
Jan 227°C26°C29°C 201924°C 199647%
Jan 327°C26°C29°C 201324°C 199647%
Jan 427°C26°C29°C 201625°C 199647%
Jan 527°C26°C28°C 201325°C 199647%
Jan 627°C26°C29°C 201325°C 199746%
Jan 727°C26°C29°C 201325°C 199745%
Jan 827°C26°C29°C 201325°C 199743%
Jan 927°C26°C29°C 201325°C 199743%
Jan 1027°C26°C29°C 201324°C 200942%
Jan 1127°C26°C29°C 200324°C 200940%
Jan 1227°C26°C28°C 201624°C 200939%
Jan 1327°C26°C28°C 201624°C 199738%
Jan 1427°C26°C29°C 201624°C 200937%
Jan 1527°C26°C29°C 201624°C 200936%
Jan 1627°C26°C29°C 200324°C 200935%
Jan 1727°C26°C29°C 201625°C 200934%
Jan 1827°C26°C29°C 201325°C 200935%
Jan 1927°C26°C29°C 199825°C 200936%
Jan 2027°C26°C29°C 201624°C 200936%
Jan 2127°C26°C29°C 201624°C 201436%
Jan 2227°C26°C29°C 201624°C 201437%
Jan 2327°C26°C29°C 201624°C 201437%
Jan 2427°C26°C29°C 201624°C 201437%
Jan 2527°C26°C29°C 199824°C 201438%
Jan 2627°C26°C28°C 199825°C 201438%
Jan 2727°C26°C29°C 199825°C 201438%
Jan 2827°C26°C29°C 199825°C 200538%
Jan 2927°C26°C29°C 199825°C 199338%
Jan 3028°C26°C28°C 201625°C 199336%
Jan 3128°C26°C29°C 199124°C 201435%

Chance of rain

The chance of at least 1 mm of precipitation in the reanalysis on each date at Ko Samui, in percent.010203040501102030
  • Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT+7).

January 1
sunrise 6:36 AM, sunset 6:11 PM
January 31
sunrise 6:42 AM, sunset 6:25 PM

Every day of January: sun and moon

Other months

Sources

Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.