Sea temperature - Thailand: month by month
Average sea temperature each month - a rough guide to when it's worth going. Current month highlighted.
| Month | Average | Warmest |
|---|---|---|
| January | 28.4°C | Krabi 29.0°C |
| February | 29.1°C | Krabi 29.5°C |
| March | 29.9°C | Krabi 30.4°C |
| April | 31.1°C | Krabi 31.6°C |
| May | 31.5°C | Krabi 31.8°C |
| June | 30.6°C | Koh Samui 30.9°C |
| July | 30.2°C | Koh Samui 30.6°C |
| August | 30.3°C | Koh Samui 30.7°C |
| September | 29.8°C | Koh Samui 30.1°C |
| October | 30.1°C | Koh Samui 30.3°C |
| November | 29.6°C | Krabi 29.8°C |
| December | 28.8°C | Krabi 29.2°C |
Frequently asked questions
In which month is the sea warmest?
Warmest: May, about 31.5°C on average.
When is the sea coldest?
Coldest: January, about 28.4°C on average.
What is the sea temperature in summer?
In summer (June-August) about 30.4°C on average.
In which months is the sea warmest?
The sea usually exceeds 24°C from January to December.
Sea temperature - Thailand, January
Average (January): about 28.4°C. Warmest: Krabi (29.0°C).
Sea temperature - Thailand, February
Average (February): about 29.1°C. Warmest: Krabi (29.5°C).
Sea temperature - Thailand, March
Average (March): about 29.9°C. Warmest: Krabi (30.4°C).
Sea temperature - Thailand, April
Average (April): about 31.1°C. Warmest: Krabi (31.6°C).
Sea temperature - Thailand, May
Average (May): about 31.5°C. Warmest: Krabi (31.8°C).
Sea temperature - Thailand, June
Average (June): about 30.6°C. Warmest: Koh Samui (30.9°C).
Sea temperature - Thailand, July
Average (July): about 30.2°C. Warmest: Koh Samui (30.6°C).
Sea temperature - Thailand, August
Average (August): about 30.3°C. Warmest: Koh Samui (30.7°C).
Sea temperature - Thailand, September
Average (September): about 29.8°C. Warmest: Koh Samui (30.1°C).
Sea temperature - Thailand, October
Average (October): about 30.1°C. Warmest: Koh Samui (30.3°C).
Sea temperature - Thailand, November
Average (November): about 29.6°C. Warmest: Krabi (29.8°C).
Sea temperature - Thailand, December
Average (December): about 28.8°C. Warmest: Krabi (29.2°C).