Weather Expected at Thailand's Dive Sites

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These are only educated guesses. Weather is unprecictable, especially far enough in advance to plan holidays. The weather conditions on this page are based on the experience of a number of dive schools and operators who have been diving the specific areas for years.
Andaman Sea - Expected Weather Conditions
MonthsUnderwaterSurface
Jan-MarExcellentCalm
AprGood/ExcellentCalm/choppy
May-OctPoor/GoodChoppy/rough
Nov-DecGoodChoppy
Comments: recent years have seen east winds strengthen and may prevent smaller boats from reaching distant sites
Ko Phi Phi - Expected Weather Conditions
MonthsUnderwaterSurface
Jan-AprExcellentCalm
May-JulGoodChoppy
AugFairChoppy
SepFairChoppy
OctFairChoppy
Nov-DecExcellentCalm
Comment: Protected because of location
Ko Lanta Area - Expected Weather Conditions
MonthsUnderwaterSurface
Jan-AprExcellentCalm
May-JunFairChoppy
Jul-AugFair/PoorChoppy/Large waves
Sep-OctPoorLarge Waves
NovGoodChoppy
DecExcellentCalm
Butang Group/Ko Tarutao - Expected Weather Conditions
MonthsUnderwaterSurface
Jan-FebGoodChoppy
MarFairChoppy
AprFairCalm
MayGoodCalm
Jun-AugExcellentChoppy
Sep-OctExcellentLarge waves
Nov-DecExcellentChoppy
Comment: winds from the west - clean clear water from the Indian Ocean depths
West Gulf of Thailand - Expected Weather Conditions
MonthsUnderwaterSurface
Jan-FebFair/GoodChoppy
MarExcellentCalm
Apr-JunFair/GoodChoppy
Jul-AugExcellentChoppy
SepExcellentChoppy
OctExcellentCalm
Nov-DecPoorLarge Waves
Pattaya - Expected Weather Conditions
MonthsUnderwaterSurface
Jan-MarExcellentCalm
AprilFairLarge Waves
MayFairRain, large waves
June-AugGoodChoppy, SW
SepExcellentSome rain, flat seas
OctPoorRain, storms
Nov-DecGoodChoppy, NE
Note: SW=Southwest Monsoon   NE=Northeast Monsoon
Ko Chang - Expected Weather Conditions
MonthsUnderwaterSurface
Jan-MarExcellentCalm
AprilFairLarge Waves
May-OctPoorRain, large waves, SW
Nov-DecGoodChoppy, NE
Note: SW=Southwest Monsoon   NE=Northeast Monsoon