Ko Samui climate

Ko Samui Weather in August

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 29°C on August 1 to 29°C on August 31, and lows from 27°C to 27°C. Normal precipitation for the month is 158 mm over about 25 wet days.

August 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.2426283032151015202530
  • Normal low
  • Normal high
  • Reanalysis extreme high
  • Reanalysis extreme low

August at a glance

Average high
29°C
Average low
27°C
Precipitation
158 mm
Reanalysis high
31°CAug 11, 2007
Reanalysis low
26°CAug 13, 2020
Daylight
12 h 32 min to 12 h 19 min
Cloud cover
86%
Humidity
81%
Dew point
25°C
Wind
18.7 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
Aug 129°C27°C30°C 201426°C 200684%
Aug 229°C27°C30°C 201126°C 200684%
Aug 329°C27°C30°C 201826°C 200084%
Aug 429°C27°C30°C 201226°C 200083%
Aug 529°C27°C30°C 202026°C 200082%
Aug 629°C27°C30°C 201926°C 200082%
Aug 729°C27°C30°C 201926°C 200081%
Aug 829°C27°C30°C 200326°C 200081%
Aug 929°C27°C30°C 201226°C 200080%
Aug 1029°C27°C30°C 201226°C 200080%
Aug 1129°C27°C31°C 200726°C 199281%
Aug 1229°C27°C30°C 199727°C 199280%
Aug 1329°C27°C30°C 201226°C 202081%
Aug 1429°C27°C30°C 201526°C 200081%
Aug 1529°C27°C30°C 199326°C 200081%
Aug 1629°C27°C30°C 200226°C 200081%
Aug 1729°C27°C30°C 201626°C 200081%
Aug 1829°C27°C30°C 201527°C 200382%
Aug 1929°C27°C30°C 201927°C 199683%
Aug 2029°C27°C30°C 199227°C 199484%
Aug 2129°C27°C30°C 201627°C 200085%
Aug 2229°C27°C30°C 202026°C 200086%
Aug 2329°C27°C30°C 201627°C 199988%
Aug 2429°C27°C30°C 201726°C 200188%
Aug 2529°C27°C30°C 200326°C 199988%
Aug 2629°C27°C30°C 201326°C 199989%
Aug 2729°C27°C30°C 202026°C 199988%
Aug 2829°C27°C30°C 202026°C 199989%
Aug 2929°C27°C30°C 202026°C 201189%
Aug 3029°C27°C30°C 202026°C 199990%
Aug 3129°C27°C30°C 202026°C 200289%

Chance of rain

The chance of at least 1 mm of precipitation in the reanalysis on each date at Ko Samui, in percent.0204060801001102030
  • Chance of a wet day

Sunrise and sunset

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

August 1
sunrise 6:11 AM, sunset 6:43 PM
August 31
sunrise 6:11 AM, sunset 6:30 PM

Every day of August: 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.